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1. Improved sub-ice platelet layer mapping with multi-frequency EM induction sounding

Author: Neudert, Mara, Arndt, Stefanie, Hendricks, Stefan, Hoppmann, Mario, Schulze, Markus, and Haas, Christian
Published: 2024
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2. Digital elevation models of the sea-ice surface from airborne laser scanning during MOSAiC

Author: Hutter, Nils, Hendricks, Stefan, Jutila, Arttu, Ricker, Robert, von Albedyll, Luisa, Birnbaum, Gerit, and Haas, Christian
Published: 2023
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3. Design of a VR-Based Campus Tour Platform with a User-Friendly Scene Asset Management System

Author: Hendricks, Stefan, Shaker, Alfred, Kim, Jong-Hoon, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Kim, Jong-Hoon, editor, Singh, Madhusudan, editor, Khan, Javed, editor, Tiwary, Uma Shanker, editor, Sur, Marigankar, editor, and Singh, Dhananjay, editor
Published: 2022
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4. Evidence for an Increasing Role of Ocean Heat in Arctic Winter Sea Ice Growth

Author: Ricker, Robert, Kauker, Frank, Schweiger, Axel, Hendricks, Stefan, Zhang, Jinlun, and Paul, Stephan
Published: 2021

5. Sea ice surface temperatures from helicopter-borne thermal infrared imaging during the MOSAiC expedition

Author: Thielke, Linda, Huntemann, Marcus, Hendricks, Stefan, Jutila, Arttu, Ricker, Robert, and Spreen, Gunnar
Published: 2022
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6. Dual-hemisphere sea ice thickness reference measurements from multiple data sources for evaluation and product inter-comparison of satellite altimetry.

Author: Olsen, Ida Birgitte Lundtorp, Skourup, Henriette, Sallila, Heidi, Hendricks, Stefan, Hansen, Renée Mie Fredensborg, Kern, Stefan, Paul, Stephan, Bocquet, Marion, Fleury, Sara, Divine, Dmitry, and Rinne, Eero
Subjects: SEA ice, SNOW accumulation, GOVERNMENT policy on climate change, THICKNESS measurement, ALTIMETRY, BUOYS
Abstract: Sea ice altimetry currently remains the primary method for estimating sea ice thickness from space, however time-series of sea ice thickness estimates are of limited use without having been quality-controlled against reference measurements. Such reference observations for sea ice thickness validation in the polar regions are sparse and rarely presented in a format matching the satellite-derived products. Here, the first published comprehensive collection of sea ice reference observations including freeboard, thickness, draft and snow depth from sea ice-covered regions in the Northern Hemisphere (NH) and the Southern Hemisphere (SH) is presented. The observations have been collected using airborne sensors, autonomous drifting buoys, moored and submarine-mounted upward-looking sonars, and visual observations. The data package has been prepared to match the spatial (25 km for NH and 50 km for SH) and temporal (monthly) resolutions of conventional satellite altimetry-derived sea ice thickness data products for a direct evaluation of these. This data package, also known as the Climate Change Initiative (CCI) sea ice thickness (SIT) Round Robin Data Package (RRDP) was produced within the ESA CCI sea ice project. The current version of the CCI SIT RRDP covers the polar satellite altimetry era (1993–2021) and is part of ongoing efforts to keep the dataset updated. The CCI SIT RRDP has been collocated to satellite-derived sea ice thickness products from CryoSat-2, Envisat and ERS-1/2 produced within ESA CCI and the Fundamental Data Records for Altimetry (FDR4ALT) project to demonstrate the overlap and inter-comparison between the reference observations and satellite-derived products. Here, the CCI SIT RRDP is introduced along with examples of its use as a validation source for satellite altimetry products, where the averaging, collocation and uncertainty methodology is presented and their advantages and limitations are discussed. [ABSTRACT FROM AUTHOR]
Published: 2024
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7. Altimetry for the future: Building on 25 years of progress

Author: Abdalla, Saleh, Abdeh Kolahchi, Abdolnabi, Ablain, Michaël, Adusumilli, Susheel, Aich Bhowmick, Suchandra, Alou-Font, Eva, Amarouche, Laiba, Andersen, Ole Baltazar, Antich, Helena, Aouf, Lotfi, Arbic, Brian, Armitage, Thomas, Arnault, Sabine, Artana, Camila, Aulicino, Giuseppe, Ayoub, Nadia, Badulin, Sergei, Baker, Steven, Banks, Chris, Bao, Lifeng, Barbetta, Silvia, Barceló-Llull, Bàrbara, Barlier, François, Basu, Sujit, Bauer-Gottwein, Peter, Becker, Matthias, Beckley, Brian, Bellefond, Nicole, Belonenko, Tatyana, Benkiran, Mounir, Benkouider, Touati, Bennartz, Ralf, Benveniste, Jérôme, Bercher, Nicolas, Berge-Nguyen, Muriel, Bettencourt, Joao, Blarel, Fabien, Blazquez, Alejandro, Blumstein, Denis, Bonnefond, Pascal, Borde, Franck, Bouffard, Jérôme, Boy, François, Boy, Jean-Paul, Brachet, Cédric, Brasseur, Pierre, Braun, Alexander, Brocca, Luca, Brockley, David, Brodeau, Laurent, Brown, Shannon, Bruinsma, Sean, Bulczak, Anna, Buzzard, Sammie, Cahill, Madeleine, Calmant, Stéphane, Calzas, Michel, Camici, Stefania, Cancet, Mathilde, Capdeville, Hugues, Carabajal, Claudia Cristina, Carrere, Loren, Cazenave, Anny, Chassignet, Eric P., Chauhan, Prakash, Cherchali, Selma, Chereskin, Teresa, Cheymol, Cecile, Ciani, Daniele, Cipollini, Paolo, Cirillo, Francesca, Cosme, Emmanuel, Coss, Steve, Cotroneo, Yuri, Cotton, David, Couhert, Alexandre, Coutin-Faye, Sophie, Crétaux, Jean-François, Cyr, Frederic, d’Ovidio, Francesco, Darrozes, José, David, Cedric, Dayoub, Nadim, De Staerke, Danielle, Deng, Xiaoli, Desai, Shailen, Desjonqueres, Jean-Damien, Dettmering, Denise, Di Bella, Alessandro, Díaz-Barroso, Lara, Dibarboure, Gerald, Dieng, Habib Boubacar, Dinardo, Salvatore, Dobslaw, Henryk, Dodet, Guillaume, Doglioli, Andrea, Domeneghetti, Alessio, Donahue, David, Dong, Shenfu, Donlon, Craig, Dorandeu, Joël, Drezen, Christine, Drinkwater, Mark, Du Penhoat, Yves, Dushaw, Brian, Egido, Alejandro, Erofeeva, Svetlana, Escudier, Philippe, Esselborn, Saskia, Exertier, Pierre, Fablet, Ronan, Falco, Cédric, Farrell, Sinead Louise, Faugere, Yannice, Femenias, Pierre, Fenoglio, Luciana, Fernandes, Joana, Fernández, Juan Gabriel, Ferrage, Pascale, Ferrari, Ramiro, Fichen, Lionel, Filippucci, Paolo, Flampouris, Stylianos, Fleury, Sara, Fornari, Marco, Forsberg, Rene, Frappart, Frédéric, Frery, Marie-laure, Garcia, Pablo, Garcia-Mondejar, Albert, Gaudelli, Julia, Gaultier, Lucile, Getirana, Augusto, Gibert, Ferran, Gil, Artur, Gilbert, Lin, Gille, Sarah, Giulicchi, Luisella, Gómez-Enri, Jesús, Gómez-Navarro, Laura, Gommenginger, Christine, Gourdeau, Lionel, Griffin, David, Groh, Andreas, Guerin, Alexandre, Guerrero, Raul, Guinle, Thierry, Gupta, Praveen, Gutknecht, Benjamin D., Hamon, Mathieu, Han, Guoqi, Hauser, Danièle, Helm, Veit, Hendricks, Stefan, Hernandez, Fabrice, Hogg, Anna, Horwath, Martin, Idžanović, Martina, Janssen, Peter, Jeansou, Eric, Jia, Yongjun, Jia, Yuanyuan, Jiang, Liguang, Johannessen, Johnny A., Kamachi, Masafumi, Karimova, Svetlana, Kelly, Kathryn, Kim, Sung Yong, King, Robert, Kittel, Cecile M.M., Klein, Patrice, Klos, Anna, Knudsen, Per, Koenig, Rolf, Kostianoy, Andrey, Kouraev, Alexei, Kumar, Raj, Labroue, Sylvie, Lago, Loreley Selene, Lambin, Juliette, Lasson, Léa, Laurain, Olivier, Laxenaire, Rémi, Lázaro, Clara, Le Gac, Sophie, Le Sommer, Julien, Le Traon, Pierre-Yves, Lebedev, Sergey, Léger, Fabien, Legresy, Benoı̂t, Lemoine, Frank, Lenain, Luc, Leuliette, Eric, Levy, Marina, Lillibridge, John, Liu, Jianqiang, Llovel, William, Lyard, Florent, Macintosh, Claire, Makhoul Varona, Eduard, Manfredi, Cécile, Marin, Frédéric, Mason, Evan, Massari, Christian, Mavrocordatos, Constantin, Maximenko, Nikolai, McMillan, Malcolm, Medina, Thierry, Melet, Angelique, Meloni, Marco, Mertikas, Stelios, Metref, Sammy, Meyssignac, Benoit, Minster, Jean-François, Moreau, Thomas, Moreira, Daniel, Morel, Yves, Morrow, Rosemary, Moyard, John, Mulet, Sandrine, Naeije, Marc, Nerem, Robert Steven, Ngodock, Hans, Nielsen, Karina, Nilsen, Jan Even Øie, Niño, Fernando, Nogueira Loddo, Carolina, Noûs, Camille, Obligis, Estelle, Otosaka, Inès, Otten, Michiel, Oztunali Ozbahceci, Berguzar, P. Raj, Roshin, Paiva, Rodrigo, Paniagua, Guillermina, Paolo, Fernando, Paris, Adrien, Pascual, Ananda, Passaro, Marcello, Paul, Stephan, Pavelsky, Tamlin, Pearson, Christopher, Penduff, Thierry, Peng, Fukai, Perosanz, Felix, Picot, Nicolas, Piras, Fanny, Poggiali, Valerio, Poirier, Étienne, Ponce de León, Sonia, Prants, Sergey, Prigent, Catherine, Provost, Christine, Pujol, M-Isabelle, Qiu, Bo, Quilfen, Yves, Rami, Ali, Raney, R. Keith, Raynal, Matthias, Remy, Elisabeth, Rémy, Frédérique, Restano, Marco, Richardson, Annie, Richardson, Donald, Ricker, Robert, Ricko, Martina, Rinne, Eero, Rose, Stine Kildegaard, Rosmorduc, Vinca, Rudenko, Sergei, Ruiz, Simón, Ryan, Barbara J., Salaün, Corinne, Sanchez-Roman, Antonio, Sandberg Sørensen, Louise, Sandwell, David, Saraceno, Martin, Scagliola, Michele, Schaeffer, Philippe, Scharffenberg, Martin G., Scharroo, Remko, Schiller, Andreas, Schneider, Raphael, Schwatke, Christian, Scozzari, Andrea, Ser-giacomi, Enrico, Seyler, Frederique, Shah, Rashmi, Sharma, Rashmi, Shaw, Andrew, Shepherd, Andrew, Shriver, Jay, Shum, C.K., Simons, Wim, Simonsen, Sebatian B., Slater, Thomas, Smith, Walter, Soares, Saulo, Sokolovskiy, Mikhail, Soudarin, Laurent, Spatar, Ciprian, Speich, Sabrina, Srinivasan, Margaret, Srokosz, Meric, Stanev, Emil, Staneva, Joanna, Steunou, Nathalie, Stroeve, Julienne, Su, Bob, Sulistioadi, Yohanes Budi, Swain, Debadatta, Sylvestre-baron, Annick, Taburet, Nicolas, Tailleux, Rémi, Takayama, Katsumi, Tapley, Byron, Tarpanelli, Angelica, Tavernier, Gilles, Testut, Laurent, Thakur, Praveen K., Thibaut, Pierre, Thompson, LuAnne, Tintoré, Joaquín, Tison, Céline, Tourain, Cédric, Tournadre, Jean, Townsend, Bill, Tran, Ngan, Trilles, Sébastien, Tsamados, Michel, Tseng, Kuo-Hsin, Ubelmann, Clément, Uebbing, Bernd, Vergara, Oscar, Verron, Jacques, Vieira, Telmo, Vignudelli, Stefano, Vinogradova Shiffer, Nadya, Visser, Pieter, Vivier, Frederic, Volkov, Denis, von Schuckmann, Karina, Vuglinskii, Valerii, Vuilleumier, Pierrik, Walter, Blake, Wang, Jida, Wang, Chao, Watson, Christopher, Wilkin, John, Willis, Josh, Wilson, Hilary, Woodworth, Philip, Yang, Kehan, Yao, Fangfang, Zaharia, Raymond, Zakharova, Elena, Zaron, Edward D., Zhang, Yongsheng, Zhao, Zhongxiang, Zinchenko, Vadim, and Zlotnicki, Victor
Published: 2021
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8. Design of a VR-Based Campus Tour Platform with a User-Friendly Scene Asset Management System

Author: Hendricks, Stefan, primary, Shaker, Alfred, additional, and Kim, Jong-Hoon, additional
Published: 2022
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9. Lead fractions from SAR-derived sea ice divergence during MOSAiC

Author: Howell, Stephen, von Albedyll, Luisa, Hendricks, Stefan, Hutter, Nils, Murashkin, Dmitrii, Kaleschke, Lars, Willmes, Sascha, Thielke, Linda, Tian-Kunze, Xiangshan, Spreen, Gunnar, Haas, Christian, Howell, Stephen, von Albedyll, Luisa, Hendricks, Stefan, Hutter, Nils, Murashkin, Dmitrii, Kaleschke, Lars, Willmes, Sascha, Thielke, Linda, Tian-Kunze, Xiangshan, Spreen, Gunnar, and Haas, Christian
Abstract: Leads and fractures in sea ice play a crucial role in the heat and gas exchange between the ocean and atmosphere, impacting atmospheric, ecological, and oceanic processes. We estimated lead fractions from high-resolution divergence obtained from satellite synthetic aperture radar (SAR) data and evaluated them against existing lead products. We derived two new lead fraction products from divergence with a spatial resolution of 700mcalculated from daily Sentinel-1 images. For the first lead product, we advected and accumulated the lead fractions of individual time nstances. With those accumulated divergence-derived lead fractions, we comprehensively described the presence of up to 10 d old leads and analyzed their deformation history. For the second lead product, we used only divergence pixels that were identified as part of linear kinematic features (LKFs). Both new lead products accurately captured the formation of new leads with widths of up to a few hundred meters. We resented a Lagrangian time series of the divergence-based lead fractions along the drift of the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition in the central Arctic Ocean during winter 2019–2020. Lead activity was high in fall and spring, consistent with wind forcing and ice pack consolidation. At larger scales of 50–150 km around the MOSAiC expedition, lead activity on all scales was similar, but differences emerged at smaller scales (10 km). We compared our lead products with six others from satellite and airborne sources, including classified SAR, thermal infrared, microwave radiometer, and altimeter data. We found that the mean lead fractions varied by 1 order of magnitude across different lead products due to different physical lead and sea ice properties observed by the sensors and methodological factors such as spatial resolution. Thus, the choice of lead product should align with the specific application.
Published: 2024

10. SMOS-derived Antarctic thin sea ice thickness: data description and validation in the Weddell Sea

Author: Kaleschke, Lars, Tian-Kunze, Xiangshan, Hendricks, Stefan, Ricker, Robert, Kaleschke, Lars, Tian-Kunze, Xiangshan, Hendricks, Stefan, and Ricker, Robert
Abstract: Abstract. Accurate satellite measurements of the thickness of Antarctic sea ice are urgently needed but pose a particular challenge. The Antarctic data presented here were produced using a method to derive the sea ice thickness from 1.4 GHz brightness temperatures previously developed for the Arctic, with only modified auxiliary data. The ability to observe the thickness of thin sea ice using this method is limited to cold conditions, meaning it is only reasonable during the freezing period, typically March to October. The Soil Moisture and Ocean Salinity (SMOS) level-3 sea ice thickness product contains estimates of the sea ice thickness and its uncertainty up to a thickness of about 1 m. The sea ice thickness is provided as a daily average on a polar stereographic projection grid with a sample resolution of 12.5 km, while the SMOS brightness temperature data used have a footprint size of about 35–40 km in diameter. Data from SMOS have been available since 2010, and the mission's operation has been extended to continue until at least the end of 2025. Here we compare two versions of the SMOS Antarctic sea ice thickness product which are based on different level-1 input data (v3.2 based on SMOS L1C v620 and v3.3 based on SMOS L1C 724). A validation is performed to generate a first baseline reference for future improvements of the retrieval algorithm and synergies with other sensors. Sea ice thickness measurements to validate the SMOS product are particularly rare in Antarctica, especially during the winter season and for the valid range of thicknesses. From the available validation measurements, we selected datasets from the Weddell Sea that have varying degrees of representativeness: Helicopter-based EM Bird (HEM), Surface and Under-Ice Trawl (SUIT), and stationary Upward-Looking Sonars (ULS). While the helicopter can measure hundreds of kilometres, SUIT's use is limited to distances of a few kilometres and thus only captures a small fraction of an SMOS foot
Published: 2024

11. Lead fractions from SAR-derived sea ice divergence during MOSAiC.

Author: von Albedyll, Luisa, Hendricks, Stefan, Hutter, Nils, Murashkin, Dmitrii, Kaleschke, Lars, Willmes, Sascha, Thielke, Linda, Tian-Kunze, Xiangshan, Spreen, Gunnar, and Haas, Christian
Subjects: *SYNTHETIC aperture radar, *ARCTIC climate, *SEA ice, *CONSUMER preferences, *MICROWAVE radiometers, ARCTIC exploration
Abstract: Leads and fractures in sea ice play a crucial role in the heat and gas exchange between the ocean and atmosphere, impacting atmospheric, ecological, and oceanic processes. We estimated lead fractions from high-resolution divergence obtained from satellite synthetic aperture radar (SAR) data and evaluated them against existing lead products. We derived two new lead fraction products from divergence with a spatial resolution of 700 m calculated from daily Sentinel-1 images. For the first lead product, we advected and accumulated the lead fractions of individual time instances. With those accumulated divergence-derived lead fractions, we comprehensively described the presence of up to 10 d old leads and analyzed their deformation history. For the second lead product, we used only divergence pixels that were identified as part of linear kinematic features (LKFs). Both new lead products accurately captured the formation of new leads with widths of up to a few hundred meters. We presented a Lagrangian time series of the divergence-based lead fractions along the drift of the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition in the central Arctic Ocean during winter 2019–2020. Lead activity was high in fall and spring, consistent with wind forcing and ice pack consolidation. At larger scales of 50–150 km around the MOSAiC expedition, lead activity on all scales was similar, but differences emerged at smaller scales (10 km). We compared our lead products with six others from satellite and airborne sources, including classified SAR, thermal infrared, microwave radiometer, and altimeter data. We found that the mean lead fractions varied by 1 order of magnitude across different lead products due to different physical lead and sea ice properties observed by the sensors and methodological factors such as spatial resolution. Thus, the choice of lead product should align with the specific application. [ABSTRACT FROM AUTHOR]
Published: 2024
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12. Retrieval of Snow Depth on Arctic Sea Ice From Surface‐Based, Polarimetric, Dual‐Frequency Radar Altimetry

Author: Willatt, Rosemary, primary, Stroeve, Julienne C., additional, Nandan, Vishnu, additional, Newman, Thomas, additional, Mallett, Robbie, additional, Hendricks, Stefan, additional, Ricker, Robert, additional, Mead, James, additional, Itkin, Polona, additional, Tonboe, Rasmus, additional, Wagner, David N., additional, Spreen, Gunnar, additional, Liston, Glen, additional, Schneebeli, Martin, additional, Krampe, Daniela, additional, Tsamados, Michel, additional, Demir, Oguz, additional, Wilkinson, Jeremy, additional, Jaggi, Matthias, additional, Zhou, Lu, additional, Huntemann, Marcus, additional, Raphael, Ian A., additional, Jutila, Arttu, additional, and Oggier, Marc, additional
Published: 2023
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13. SMOS-derived Antarctic thin sea-ice thickness: data description and validation in the Weddell Sea

Author: Kaleschke, Lars, primary, Tian-Kunze, Xiangshan, additional, Hendricks, Stefan, additional, and Ricker, Robert, additional
Published: 2023
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14. Introduction

Author: Boyer, Tim, primary, Bartow-Gillies, Ellen, additional, Abida, A., additional, Ades, Melanie, additional, Adler, Robert, additional, Adusumilli, Susheel, additional, Agyakwah, W., additional, Ahmasuk, Brandon, additional, Aldeco, Laura S., additional, Alexe, Mihai, additional, Alfaro, Eric J., additional, Allan, Richard P., additional, Allgood, Adam, additional, Alves, Lincoln. M., additional, Amador, Jorge A., additional, Anderson, John, additional, Andrade, B., additional, Anneville, Orlane, additional, Aono, Yasuyuki, additional, Arguez, Anthony, additional, Arosio, Carlo, additional, Atkinson, C., additional, Augustine, John A., additional, Avalos, Grinia, additional, Azorin-Molina, Cesar, additional, Backensto, Stacia A., additional, Bader, Stephan, additional, Baez, Julian, additional, Baiman, Rebecca, additional, Ballinger, Thomas J., additional, Banwell, Alison F., additional, Bardin, M. Yu, additional, Barichivich, Jonathan, additional, Barnes, John E., additional, Barreira, Sandra, additional, Beadling, Rebecca L., additional, Beck, Hylke E., additional, Becker, Emily J., additional, Bekele, E., additional, Bellido, Guillem Martín, additional, Bellouin, Nicolas, additional, Benedetti, Angela, additional, Benestad, Rasmus, additional, Berne, Christine, additional, Berner, Logan. T., additional, Bernhard, Germar H., additional, Bhatt, Uma S., additional, Bhuiyan, A. E., additional, Bigalke, Siiri, additional, Biló, Tiago, additional, Bissolli, Peter, additional, Bjerke Jarle, W., additional, Blagrave, Kevin, additional, Blake, Eric S., additional, Blenkinsop, Stephen, additional, Blunden, Jessica, additional, Bochníček, Oliver, additional, Bock, Olivier, additional, Bodenstein, Barbara, additional, Bodin, Xavier, additional, Bosilovich, Michael, additional, Boucher, Olivier, additional, Bozkurt, Deniz, additional, Brettschneider, Brian, additional, Bringas, Francis G., additional, Bringas, Francis, additional, Buechler, Dennis, additional, Buehler, Stefan A., additional, Bukunt, Brandon, additional, Calderón, Blanca, additional, Camargo, Suzana J., additional, Campbell, Jayaka, additional, Campos, Diego, additional, Carrea, Laura, additional, Carter, Brendan R., additional, Cetinić, Ivona, additional, Chambers, Don P., additional, Chan, Duo, additional, Chandler, Elise, additional, Chang, Kai-Lan, additional, Chen, Hua, additional, Chen, Lin, additional, Cheng, Lijing, additional, Cheng, Vincent Y. S., additional, Chomiak, Leah, additional, Christiansen, Hanne H., additional, Christy, John R., additional, Chung, Eui-Seok, additional, Ciasto, Laura M., additional, Clarke, Leonardo, additional, Clem, Kyle R., additional, Clingan, Scott, additional, Coelho, Caio A.S., additional, Cohen, Judah L., additional, Coldewey-Egbers, Melanie, additional, Colwell, Steve, additional, Cooper, Owen R., additional, Cornes, Richard C., additional, Correa, Kris, additional, Costa, Felipe, additional, Covey, Curt, additional, Coy, Lawrence, additional, Créatux, Jean-François, additional, Crhova, Lenka, additional, Crimmins, Theresa, additional, Cronin, Meghan F., additional, Cropper, Thomas, additional, Crotwell, Molly, additional, Culpepper, Joshua, additional, Cunha, Ana P., additional, Cusicanqui, Diego, additional, Datta, Rajashree T., additional, Davis, Sean M., additional, De Bock, Veerle, additional, de Jeu, Richard A. M., additional, De Laat, Jos, additional, Decharme, Bertrand, additional, Degenstein, Doug, additional, Delaloye, Reynald, additional, Demircan, Mesut, additional, Derksen, Chris, additional, Deus, Ricardo, additional, Dhurmea, K. R., additional, Diamond, Howard J., additional, Dirkse, S., additional, Divine, Dmitry, additional, Dokulil, Martin T., additional, Donat, Markus G., additional, Dong, Shenfu, additional, Dorigo, Wouter A., additional, Drost Jensen, Caroline, additional, Druckenmiller, Matthew L., additional, Drumond, Paula, additional, du Plessis, Marcel, additional, Dugan, Hilary A., additional, Dulamsuren, Dashkhuu, additional, Dunmire, Devon, additional, Dunn, Robert J. H., additional, Durre, Imke, additional, Dusek, Robert, additional, Dutton, Geoff, additional, Duveiller, Gregory, additional, Ekici, Mithat, additional, Elias Chereque, Alesksandra, additional, ElKharrim, M., additional, Epstein, Howard E., additional, Espinoza, Jhan-Carlo, additional, Estilow, Thomas W., additional, Estrella, Nicole, additional, Fauchereau, Nicolas, additional, Fausto, Robert S., additional, Feely, Richard A., additional, Fenimore, Chris, additional, Fereday, David, additional, Fettweis, Xavier, additional, Fioletov, vitali E., additional, Flemming, Johannes, additional, Fogarty, Chris, additional, Fogt, Ryan L., additional, Forbes, Bruce C., additional, Foster, Michael J., additional, Franz, Bryan A., additional, Freeman, Natalie M., additional, Fricker, Helen A., additional, Frith, Stacey M., additional, Froidevaux, Lucien, additional, Frost, Gerald V. (JJ), additional, Fuhrman, Steven, additional, Füllekrug, Martin, additional, Ganter, Catherine, additional, Gao, Meng, additional, Gardner, Alex S., additional, Garforth, Judith, additional, Garg, Jay, additional, Gerland, Sebastian, additional, Gibbes, Badin, additional, Gille, Sarah T., additional, Gilson, John, additional, Gleason, Karin, additional, Gobron, Nadine, additional, Goetz, Scott J., additional, Goldenberg, Stanley B., additional, Goni, Gustavo, additional, Goodman, Steven, additional, Goto, Atsushi, additional, Grooß, Jens-Uwe, additional, Gruber, Alexander, additional, Gu, Guojun, additional, Guard, Charles “Chip” P., additional, Hagos, S., additional, Hahn, Sebastian, additional, Haimberger, Leopold, additional, Hall, Bradley D., additional, Hamlington, Benjamin D., additional, Hanna, Edward, additional, Hanssen-Bauer, Inger, additional, Harnos, Daniel S., additional, Harris, Ian, additional, He, Qiong, additional, Heim, Richard R., additional, Hellström, Sverker, additional, Hemming, Deborah L., additional, Hendricks, Stefan, additional, Hicks, J., additional, Hidalgo, Hugo G., additional, Hirschi, Martin, additional, Ho, Shu-peng (Ben), additional, Hobbs, W., additional, Holmes, Robert M., additional, Holzworth, Robert, additional, Hrbáček, Filip, additional, Hu, Guojie, additional, Hu, Zeng-Zhen, additional, Huang, Boyin, additional, Huang, Hongjie, additional, Hurst, Dale F., additional, Ialongo, Iolanda, additional, Inness, Antje, additional, Isaksen, Ketil, additional, Ishii, Masayoshi, additional, Jadra, Gerardo, additional, Jevrejeva, Svetlana, additional, John, Viju O., additional, Johns, W., additional, Johnsen, Bjørn, additional, Johnson, Bryan, additional, Johnson, Gregory C., additional, Jones, Philip D., additional, Jones, Timothy, additional, Josey, Simon A., additional, Jumaux, G., additional, Junod, Robert, additional, Kääb, Andreas, additional, Kabidi, K., additional, Kaiser, Johannes W., additional, Kaler, Robb S.A., additional, Kaleschke, Lars, additional, Kaufmann, Viktor, additional, Kazemi, Amin Fazl, additional, Keller, Linda M., additional, Kellerer-Pirklbauer, Andreas, additional, Kendon, Mike, additional, Kennedy, John, additional, Kent, Elizabeth C., additional, Kerr, Kenneth, additional, Khan, Valentina, additional, Khiem, Mai Van, additional, Kidd, Richard, additional, Kim, Mi Ju, additional, Kim, Seong-Joong, additional, Kipling, Zak, additional, Klotzbach, Philip J., additional, Knaff, John A., additional, Koppa, Akash, additional, Korshunova, Natalia N., additional, Kraemer, Benjamin M., additional, Kramarova, Natalya A., additional, Kruger, A. C., additional, Kruger, Andries, additional, Kumar, Arun, additional, L’Heureux, Michelle, additional, La Fuente, Sofia, additional, Laas, Alo, additional, Labe, Zachary M., additional, Lader, Rick, additional, Lakatos, Mónika, additional, Lakkala, Kaisa, additional, Lam, Hoang Phuc, additional, Lan, Xin, additional, Landschützer, Peter, additional, Landsea, Chris W., additional, Lang, Timothy, additional, Lankhorst, Matthias, additional, Lantz, Kathleen O., additional, Lara, Mark J., additional, Lavado-Casimiro, Waldo, additional, Lavers, David A., additional, Lazzara, Matthew A., additional, Leblanc, Thierry, additional, Lee, Tsz-Cheung, additional, Leibensperger, Eric M., additional, Lennard, Chris, additional, Leuliette, Eric, additional, Leung, Kinson H. Y., additional, Lieser, Jan L., additional, Likso, Tanja, additional, Lin, I-I., additional, Lindsey, Jackie, additional, Liu, Yakun, additional, Locarnini, Ricardo, additional, Loeb, Norman G., additional, Loomis, Bryant D., additional, Lorrey, Andrew M., additional, Loyola, Diego, additional, Lu, Rui, additional, Lumpkin, Rick, additional, Luo, Jing-Jia, additional, Luojus, Kari, additional, Lyman, John M., additional, Maberly, Stephen C., additional, Macander, Matthew J., additional, MacFerrin, Michael, additional, MacGilchrist, Graeme A., additional, MacLennan, Michelle L., additional, Madelon, Remi, additional, Magee, Andrew D., additional, Magnin, Florence, additional, Mamen, Jostein, additional, Mankoff, Ken D., additional, Manney, Gloria L., additional, Marcinonienė, Izolda, additional, Marengo, Jose A., additional, Marjan, Mohammadi, additional, Martínez, Ana E., additional, Massom, Robert A., additional, Matsuzaki, Shin-Ichiro, additional, May, Linda, additional, Mayer, Michael, additional, Mazloff, Matthew R., additional, McAfee, Stephanie A., additional, McBride, C., additional, McCabe, Matthew F., additional, McClelland, James W., additional, McPhaden, Michael J., additional, Mcvicar, Tim R., additional, Mears, Carl A., additional, Meier, Walter N., additional, Mekonnen, A., additional, Menzel, Annette, additional, Merchant, Christopher J., additional, Merrifield, Mark A., additional, Meyer, Michael F., additional, Meyers, Tristan, additional, Mikolajczyk, David E., additional, Miller, John B., additional, Miralles, Diego G., additional, Misevicius, Noelia, additional, Mishonov, Alexey, additional, Mitchum, Gary T., additional, Moat, Ben I., additional, Moesinger, Leander, additional, Moise, Aurel, additional, Molina-Carpio, Jorge, additional, Monet, Ghislaine, additional, Montzka, Stephan A., additional, Moon, Twila A., additional, Moore, G. W. K., additional, Mora, Natali, additional, Morán, Johnny, additional, Morehen, Claire, additional, Morice, Colin, additional, Mostafa, A. E., additional, Mote, Thomas L., additional, Mrekaj, Ivan, additional, Mudryk, Lawrence, additional, Mühle, Jens, additional, Müller, Rolf, additional, Nance, David, additional, Nash, Eric R., additional, Nerem, R. Steven, additional, Newman, Paul A., additional, Nicolas, Julien P., additional, Nieto, Juan J., additional, Noetzli, Jeannette, additional, Noll, Ben, additional, Norton, Taylor, additional, Nyland, Kelsey E., additional, O’Keefe, John, additional, Ochwat, Naomi, additional, Oikawa, Yoshinori, additional, Okunaka, Yuka, additional, Osborn, Timothy J., additional, Overland, James E., additional, Park, Taejin, additional, Parrington, Mark, additional, Parrish, Julia K., additional, Pasch, Richard J., additional, Pascual Ramírez, Reynaldo, additional, Pellet, Cécile, additional, Pelto, Mauri S., additional, Perčec Tadić, Melita, additional, Perovich, Donald K., additional, Petersen, Guðrún Nína, additional, Petersen, Kyle, additional, Petropavlovskikh, Irina, additional, Petty, Alek, additional, Pezza, Alexandre B., additional, Pezzi, Luciano P., additional, Phillips, Coda, additional, Phoenix, Gareth K., additional, Pierson, Don, additional, Pinto, Izidine, additional, Pires, Vanda, additional, Pitts, Michael, additional, Po-Chedley, Stephen, additional, Pogliotti, Paolo, additional, Poinar, Kristin, additional, Polvani, Lorenzo, additional, Preimesberger, Wolfgang, additional, Price, Colin, additional, Pulkkanen, Merja, additional, Purkey, Sarah G., additional, Qiu, Bo, additional, Quisbert, Kenny, additional, Quispe, Willy R., additional, Rajeevan, M., additional, Ramos, Andrea M., additional, Randel, William J., additional, Rantanen, Mika, additional, Raphael, Marilyn N., additional, Reagan, James, additional, Recalde, Cristina, additional, Reid, Phillip, additional, Rémy, Samuel, additional, Reyes Kohler, Alejandra J., additional, Ricciardulli, Lucrezia, additional, Richardson, Andrew D., additional, Ricker, Robert, additional, Robinson, David A., additional, Robjhon, M., additional, Rocha, Willy, additional, Rodell, Matthew, additional, Rodriguez Guisado, Esteban, additional, Rodriguez-Fernandez, Nemesio, additional, Romanovsky, Vladimir E., additional, Ronchail, Josyane, additional, Rosencrans, Matthew, additional, Rosenlof, Karen H., additional, Rösner, Benjamin, additional, Rösner, Henrieke, additional, Rozanov, Alexei, additional, Rozkošný, Jozef, additional, Rubek, Frans, additional, Rusanovskaya, Olga O., additional, Rutishauser, This, additional, Sabeerali, C. T., additional, Salinas, Roberto, additional, Sánchez-Lugo, Ahira, additional, Santee, Michelle L., additional, Santini, Marcelo, additional, Sato, Katsunari, additional, Sawaengphokhai, Parnchai, additional, Sayouri, A., additional, Scambos, Theodore, additional, Schenzinger, Verena, additional, Schimanke, Semjon, additional, Schlegel, Robert W., additional, Schmid, Claudia, additional, Schmid, Martin, additional, Schneider, Udo, additional, Schreck, Carl J., additional, Schultz, Cristina, additional, _, _, additional, Segele, Z. T., additional, Sensoy, Serhat, additional, Serbin, Shawn P., additional, Serreze, Mark C., additional, Setiawan, Amsari Mudzakir, additional, Sezaki, Fumi, additional, Sharma, Sapna, additional, Sharp, Jonathan D., additional, Sheffield, Gay, additional, Shi, Jia-Rui, additional, Shi, Lei, additional, Shiklomanov, Alexander I., additional, Shiklomanov, Nikolay I., additional, Shimaraeva, Svetlana V., additional, Shukla, R., additional, Siegel, David A., additional, Silow, Eugene A., additional, Sima, F., additional, Simmons, Adrian J., additional, Smeed, David A., additional, Smith, Adam, additional, Smith, Matthew M., additional, Smith, Sharon L., additional, Soden, Brian J., additional, Sofieva, Viktoria, additional, Souza, Everaldo, additional, Sparks, Tim H., additional, Spence-Hemmings, Jacqueline, additional, Spencer, Robert G. M., additional, Spillane, Sandra, additional, Sreejith, O. P., additional, Srivastava, A. K., additional, Stackhouse, Paul W., additional, Stammerjohn, Sharon, additional, Stauffer, Ryan, additional, Steinbrecht, Wolfgang, additional, Steiner, Andrea K., additional, Stella, Jose L., additional, Stephenson, Tannecia S., additional, Stradiotti, Pietro, additional, Strahan, Susan E., additional, Streletskiy, Dmitry A., additional, Surendran, Divya E., additional, Suslova, Anya, additional, Svendby, Tove, additional, Sweet, William, additional, Takahashi, Kiyotoshi, additional, Takemura, Kazuto, additional, Tank, Suzanne E., additional, Taylor, Michael A., additional, Tedesco, Marco, additional, Thackeray, Stephen J., additional, Thiaw, W. M., additional, Thibert, Emmanuel, additional, Thoman, Richard L., additional, Thompson, Andrew F., additional, Thompson, Philip R., additional, Tian-Kunze, Xiangshan, additional, Timmermans, Mary-Louise, additional, Timofeyev, Maxim A., additional, Tobin, Skie, additional, Tømmervik, Hans, additional, Tourpali, Kleareti, additional, Trescilo, Lidia, additional, Tretiakov, Mikhail, additional, Trewin, Blair C., additional, Triñanes, Joaquin A., additional, Trotman, Adrian, additional, Truchelut, Ryan E., additional, Trusel, Luke D., additional, Tye, Mari R., additional, van der A, Ronald, additional, van der Schalie, Robin, additional, van der Schrier, Gerard, additional, Van Hemert, Caroline, additional, Van Meerbeeck, Cedric J., additional, van vliet, Arnold J.H., additional, Vazife, Ahad, additional, Verburg, Piet, additional, Vernier, Jean-Paul, additional, Vimont, Isaac J., additional, Virts, Katrina, additional, Vivero, Sebastián, additional, Volkov, Denis L., additional, Vömel, Holger, additional, Vose, Russell S., additional, Walker, Donald (Skip) A., additional, Walsh, John E., additional, Wang, Bin, additional, Wang, Hui, additional, Wang, Muyin, additional, Wang, Ray H. J., additional, Wang, Xinyue, additional, Wanninkhof, Rik, additional, Warnock, Taran, additional, Weber, Mark, additional, Webster, Melinda, additional, Wehrlé, Adrian, additional, Wen, Caihong, additional, Westberry, Toby K., additional, Widlansky, Matthew J., additional, Wiese, David N., additional, Wild, Jeannette D., additional, Wille, Jonathan D., additional, Willems, An, additional, Willett, Kate M., additional, Williams, Earle, additional, Willis, J., additional, Wong, Takmeng, additional, Wood, Kimberly M., additional, Woolway, Richard Iestyn, additional, Xie, Ping-Ping, additional, Yang, Daqing, additional, Yin, Xungang, additional, Yin, Ziqi, additional, Zeng, Zhenzhong, additional, Zhang, Huai-min, additional, Zhang, Li, additional, Zhang, Peiqun, additional, Zhao, Lin, additional, Zhou, Xinjia, additional, Zhu, Zhiwei, additional, Ziemke, Jerry R., additional, Ziese, Markus, additional, Zolkos, Scott, additional, Zotta, Ruxandra M., additional, Zou, Cheng-Zhi, additional, Allen, Jessicca, additional, Camper, Amy V., additional, Haley, Bridgette O., additional, Hammer, Gregory, additional, Love-Brotak, S. Elizabeth, additional, Ohlmann, Laura, additional, Noguchi, Lukas, additional, Riddle, Deborah B., additional, and Veasey, Sara W., additional
Published: 2023
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15. The Arctic

Author: Moon, T. A., primary, Thoman, R., additional, Druckenmiller, M. L., additional, Ahmasuk, Brandon, additional, Backensto, Stacia A., additional, Ballinger, Thomas J., additional, Benestad, Rasmus, additional, Berner, Logan. T., additional, Bernhard, Germar H., additional, Bhatt, Uma S., additional, Bigalke, Siiri, additional, BjerkeJarle, W., additional, Brettschneider, Brian, additional, Christiansen, Hanne H., additional, Cohen, Judah L., additional, Decharme, Bertrand, additional, Derksen, Chris, additional, Divine, Dmitry, additional, Drost, Jensen, additional, Druckenmiller, Matthew L., additional, EliasChereque, Alesksandra, additional, Epstein, Howard E., additional, Fausto, Robert S., additional, Fettweis, Xavier, additional, Fioletov, Vitali E., additional, Forbes, Bruce C., additional, Frost, Gerald V., additional, Gerland, Sebastian, additional, Goetz, Scott J., additional, Grooß, Jens-Uwe, additional, Hanna, Edward, additional, Hanssen-Bauer, Inger, additional, Hendricks, Stefan, additional, Holmes, Robert M., additional, Ialongo, Iolanda, additional, Isaksen, Ketil, additional, Johnsen, Bjørn, additional, Jones, Timothy, additional, Kaler, Robb S.A., additional, Kaleschke, Lars, additional, Kim, Seong-Joong, additional, Labe, Zachary M., additional, Lader, Rick, additional, Lakkala, Kaisa, additional, Lara, Mark J., additional, Lindsey, Jackie, additional, Loomis, Bryant D., additional, Luojus, Kari, additional, Macander, Matthew J., additional, Mamen, Jostein, additional, Mankoff, Ken D., additional, Manney, Gloria L., additional, McAfee, Stephanie A., additional, McClelland, James W., additional, Meier, Walter N., additional, Moon, Twila A., additional, Moore, G. W. K., additional, Mote, Thomas L., additional, Mudryk, Lawrence, additional, Müller, Rolf, additional, Nyland, Kelsey E., additional, Overland, James E., additional, Parrish, Julia K., additional, Perovich, Donald K., additional, Petersen, Guðrún Nína, additional, Petty, Alek, additional, Phoenix, Gareth K., additional, Poinar, Kristin, additional, Rantanen, Mika, additional, Ricker, Robert, additional, Romanovsky, Vladimir E., additional, Serbin, Shawn P., additional, Serreze, Mark C., additional, Sheffield, Gay, additional, Shiklomanov, Alexander I., additional, Shiklomanov, Nikolay I., additional, Smith, Sharon L., additional, Spencer, Robert G. M., additional, Streletskiy, Dmitry A., additional, Suslova, Anya, additional, Svendby, Tove, additional, Tank, Suzanne E., additional, Tedesco, Marco, additional, Thoman, Richard L., additional, Tian-Kunze, Xiangshan, additional, Timmermans, Mary-Louise, additional, Tømmervik, Hans, additional, Tretiakov, Mikhail, additional, Walker, Donald A., additional, Walsh, John E., additional, Wang, Muyin, additional, Webster, Melinda, additional, Wehrlé, Adrian, additional, Yang, Dedi, additional, Zolkos, Scott, additional, Allen, Jessicca, additional, Camper, Amy V., additional, Haley, Bridgette O., additional, Hammer, Gregory, additional, Love-Brotak, S., additional, Ohlmann, Laura, additional, Noguchi, Lukas, additional, Riddle, Deborah B., additional, and Veasey, Sara W., additional
Published: 2023
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16. Lead fractions from SAR-derived sea ice divergence during MOSAiC

Author: von Albedyll, Luisa, primary, Hendricks, Stefan, additional, Hutter, Nils, additional, Murashkin, Dmitrii, additional, Kaleschke, Lars, additional, Willmes, Sascha, additional, Thielke, Linda, additional, Tian-Kunze, Xiangshan, additional, Spreen, Gunnar, additional, and Haas, Christian, additional
Published: 2023
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17. Wind redistribution of snow impacts the Ka- and Ku-band radar signatures of Arctic sea ice

Author: Nandan, Vishnu, primary, Willatt, Rosemary, additional, Mallett, Robbie, additional, Stroeve, Julienne, additional, Geldsetzer, Torsten, additional, Scharien, Randall, additional, Tonboe, Rasmus, additional, Yackel, John, additional, Landy, Jack, additional, Clemens-Sewall, David, additional, Jutila, Arttu, additional, Wagner, David N., additional, Krampe, Daniela, additional, Huntemann, Marcus, additional, Mahmud, Mallik, additional, Jensen, David, additional, Newman, Thomas, additional, Hendricks, Stefan, additional, Spreen, Gunnar, additional, Macfarlane, Amy, additional, Schneebeli, Martin, additional, Mead, James, additional, Ricker, Robert, additional, Gallagher, Michael, additional, Duguay, Claude, additional, Raphael, Ian, additional, Polashenski, Chris, additional, Tsamados, Michel, additional, Matero, Ilkka, additional, and Hoppmann, Mario, additional
Published: 2023
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18. Classification of CryoSat-2 Radar Echoes

Author: Ricker, Robert, Hendricks, Stefan, Helm, Veit, Gerdes, Rüdiger, Blondel, Philippe, Series editor, Guilyardi, Eric, Series editor, Rabassa, Jorge, Series editor, Horwood, Clive, Series editor, Lohmann, Gerrit, editor, Meggers, Helge, editor, Unnithan, Vikram, editor, Wolf-Gladrow, Dieter, editor, Notholt, Justus, editor, and Bracher, Astrid, editor
Published: 2015
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19. Heat stored in the Earth system 1960–2020: where does the energy go?

Author: von Schuckmann, Karina, primary, Minière, Audrey, additional, Gues, Flora, additional, Cuesta-Valero, Francisco José, additional, Kirchengast, Gottfried, additional, Adusumilli, Susheel, additional, Straneo, Fiammetta, additional, Ablain, Michaël, additional, Allan, Richard P., additional, Barker, Paul M., additional, Beltrami, Hugo, additional, Blazquez, Alejandro, additional, Boyer, Tim, additional, Cheng, Lijing, additional, Church, John, additional, Desbruyeres, Damien, additional, Dolman, Han, additional, Domingues, Catia M., additional, García-García, Almudena, additional, Giglio, Donata, additional, Gilson, John E., additional, Gorfer, Maximilian, additional, Haimberger, Leopold, additional, Hakuba, Maria Z., additional, Hendricks, Stefan, additional, Hosoda, Shigeki, additional, Johnson, Gregory C., additional, Killick, Rachel, additional, King, Brian, additional, Kolodziejczyk, Nicolas, additional, Korosov, Anton, additional, Krinner, Gerhard, additional, Kuusela, Mikael, additional, Landerer, Felix W., additional, Langer, Moritz, additional, Lavergne, Thomas, additional, Lawrence, Isobel, additional, Li, Yuehua, additional, Lyman, John, additional, Marti, Florence, additional, Marzeion, Ben, additional, Mayer, Michael, additional, MacDougall, Andrew H., additional, McDougall, Trevor, additional, Monselesan, Didier Paolo, additional, Nitzbon, Jan, additional, Otosaka, Inès, additional, Peng, Jian, additional, Purkey, Sarah, additional, Roemmich, Dean, additional, Sato, Kanako, additional, Sato, Katsunari, additional, Savita, Abhishek, additional, Schweiger, Axel, additional, Shepherd, Andrew, additional, Seneviratne, Sonia I., additional, Simons, Leon, additional, Slater, Donald A., additional, Slater, Thomas, additional, Steiner, Andrea K., additional, Suga, Toshio, additional, Szekely, Tanguy, additional, Thiery, Wim, additional, Timmermans, Mary-Louise, additional, Vanderkelen, Inne, additional, Wjiffels, Susan E., additional, Wu, Tonghua, additional, and Zemp, Michael, additional
Published: 2023
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20. Retrieval of Snow Depth on Arctic Sea Ice From Surface‐Based, Polarimetric, Dual‐Frequency Radar Altimetry

Author: Willatt, Rosemary, Stroeve, Julienne, Nandan, Vishnu, Newman, Thomas, Mallett, Robbie, Hendricks, Stefan, Ricker, Robert, Mead, James, Itkin, Polona, Tonboe, Rasmus, Wagner, David Nicholas, Spreen, Gunnar, Liston, Glen, Schneebeli, Martin, Krampe, Daniela, Tsamados, Michel, Demir, Oguz, Wilkinson, Jeremy, Jaggi, Matthias, Zhou, Lu, Huntemann, Marcus, Raphael, Ian A., Jutila, Arttu, Oggier, Marc, Willatt, Rosemary, Stroeve, Julienne, Nandan, Vishnu, Newman, Thomas, Mallett, Robbie, Hendricks, Stefan, Ricker, Robert, Mead, James, Itkin, Polona, Tonboe, Rasmus, Wagner, David Nicholas, Spreen, Gunnar, Liston, Glen, Schneebeli, Martin, Krampe, Daniela, Tsamados, Michel, Demir, Oguz, Wilkinson, Jeremy, Jaggi, Matthias, Zhou, Lu, Huntemann, Marcus, Raphael, Ian A., Jutila, Arttu, and Oggier, Marc
Abstract: Snow depth on sea ice is an Essential Climate Variable and a major source of uncertainty in satellite altimetry-derived sea ice thickness. During winter of the MOSAiC Expedition, the “KuKa” dual-frequency, fully polarized Ku- and Ka-band radar was deployed in “stare” nadir-looking mode to investigate the possibility of combining these two frequencies to retrieve snow depth. Three approaches were investigated: dual-frequency, dual-polarization and waveform shape, and compared to independent snow depth measurements. Novel dual-polarization approaches yielded r2 values up to 0.77. Mean snow depths agreed within 1 cm, even for data sub-banded to CryoSat-2 SIRAL and SARAL AltiKa bandwidths. Snow depths from co-polarized dual-frequency approaches were at least a factor of four too small and had a r2 0.15 or lower. r2 for waveform shape techniques reached 0.72 but depths were underestimated. Snow depth retrievals using polarimetric information or waveform shape may therefore be possible from airborne/satellite radar altimeters.
Published: 2023

21. Introduction STATE OF THE CLIMATE IN 2022

Author: Boyer, Tim, Bartow-Gillies, Ellen, Abida, A, Ades, Melanie, Adler, Robert, Adusumilli, Susheel, Agyakwah, W, Ahmasuk, Brandon, Aldeco, Laura S, Alexe, Mihai, Alfaro, Eric J, Allan, Richard P, Allgood, Adam, Alves, Lincoln M, Amador, Jorge A, Anderson, John, Andrade, B, Anneville, Orlane, Aono, Yasuyuki, Arguez, Anthony, Arosio, Carlo, Atkinson, C, Augustine, John A, Avalos, Grinia, Azorin-Molina, Cesar, Backensto, Stacia A, Bader, Stephan, Baez, Julian, Baiman, Rebecca, Ballinger, Thomas J, Banwell, Alison F, Bardin, M Yu, Barichivich, Jonathan, Barnes, John E, Barreira, Sandra, Beadling, Rebecca L, Beck, Hylke E, Becker, Emily J, Bekele, E, Bellido, Guillem Martín, Bellouin, Nicolas, Benedetti, Angela, Benestad, Rasmus, Berne, Christine, Berner, Logan T, Bernhard, Germar H, Bhatt, Uma S, Bhuiyan, AE, Bigalke, Siiri, Biló, Tiago, Bissolli, Peter, Bjerke Jarle, W, Blagrave, Kevin, Blake, Eric S, Blenkinsop, Stephen, Blunden, Jessica, Bochníček, Oliver, Bock, Olivier, Bodin, Xavier, Bosilovich, Michael, Boucher, Olivier, Bozkurt, Deniz, Brettschneider, Brian, Bringas, Francis G, Bringas, Francis, Buechler, Dennis, Buehler, Stefan A, Bukunt, Brandon, Calderón, Blanca, Camargo, Suzana J, Campbell, Jayaka, Campos, Diego, Carrea, Laura, Carter, Brendan R, Cetinić, Ivona, Chambers, Don P, Chan, Duo, Chandler, Elise, Chang, Kai-Lan, Chen, Hua, Chen, Lin, Cheng, Lijing, Cheng, Vincent YS, Chomiak, Leah, Christiansen, Hanne H, Christy, John R, Chung, Eui-Seok, Ciasto, Laura M, Clarke, Leonardo, Clem, Kyle R, Clingan, Scott, Coelho, Caio AS, Cohen, Judah L, Coldewey-Egbers, Melanie, Colwell, Steve, Cooper, Owen R, Cornes, Richard C, Correa, Kris, Costa, Felipe, Covey, Curt, Coy, Lawrence, Créatux, Jean-François, Crhova, Lenka, Crimmins, Theresa, Cronin, Meghan F, Cropper, Thomas, Crotwell, Molly, Culpepper, Joshua, Cunha, Ana P, Cusicanqui, Diego, Datta, Rajashree T, Davis, Sean M, De Bock, Veerle, de Jeu, Richard AM, De Laat, Jos, Decharme, Bertrand, Degenstein, Doug, Delaloye, Reynald, Demircan, Mesut, Derksen, Chris, Deus, Ricardo, Dhurmea, KR, Diamond, Howard J, Dirkse, S, Divine, Dmitry, Dokulil, Martin T, Donat, Markus G, Dong, Shenfu, Dorigo, Wouter A, Drost Jensen, Caroline, Druckenmiller, Matthew L, Drumond, Paula, du Plessis, Marcel, Dugan, Hilary A, Dulamsuren, Dashkhuu, Dunmire, Devon, Dunn, Robert JH, Durre, Imke, Dutton, Geoff, Duveiller, Gregory, Ekici, Mithat, Elias Chereque, Alesksandra, ElKharrim, M, Epstein, Howard E, Espinoza, Jhan-Carlo, Estilow, Thomas W, Estrella, Nicole, Fauchereau, Nicolas, Fausto, Robert S, Feely, Richard A, Fenimore, Chris, Fereday, David, Fettweis, Xavier, Fioletov, vitali E, Flemming, Johannes, Fogarty, Chris, Fogt, Ryan L, Forbes, Bruce C, Foster, Michael J, Franz, Bryan A, Freeman, Natalie M, Fricker, Helen A, Frith, Stacey M, Froidevaux, Lucien, Frost, Gerald V, Fuhrman, Steven, Füllekrug, Martin, Ganter, Catherine, Gao, Meng, Gardner, Alex S, Garforth, Judith, Garg, Jay, Gerland, Sebastian, Gibbes, Badin, Gille, Sarah T, Gilson, John, Gleason, Karin, Gobron, Nadine, Goetz, Scott J, Goldenberg, Stanley B, Goni, Gustavo, Goodman, Steven, Goto, Atsushi, Grooß, Jens-Uwe, Gruber, Alexander, Gu, Guojun, Guard, Charles Chip P, Hagos, S, Hahn, Sebastian, Haimberger, Leopold, Hall, Bradley D, Hamlington, Benjamin D, Hanna, Edward, Hanssen-Bauer, Inger, Harnos, Daniel S, Harris, Ian, He, Qiong, Heim, Richard R, Hellström, Sverker, Hemming, Deborah L, Hendricks, Stefan, Hicks, J, Hidalgo, Hugo G, Hirschi, Martin, Ho, Shu-peng, Hobbs, W, Holmes, Robert M, Holzworth, Robert, Hrbáček, Filip, Hu, Guojie, Hu, Zeng-Zhen, Huang, Boyin, Huang, Hongjie, Hurst, Dale F, Ialongo, Iolanda, Inness, Antje, Isaksen, Ketil, Ishii, Masayoshi, Jadra, Gerardo, Jevrejeva, Svetlana, John, Viju O, Johns, W, Johnsen, Bjørn, Johnson, Bryan, Johnson, Gregory C, Jones, Philip D, Jones, Timothy, Josey, Simon A, Jumaux, G, Junod, Robert, Kääb, Andreas, Kabidi, K, Kaiser, Johannes W, Kaler, Robb SA, Kaleschke, Lars, Kaufmann, Viktor, Kazemi, Amin Fazl, Keller, Linda M, Kellerer-Pirklbauer, Andreas, Kendon, Mike, Kennedy, John, Kent, Elizabeth C, Kerr, Kenneth, Khan, Valentina, Khiem, Mai Van, Kidd, Richard, Kim, Mi Ju, Kim, Seong-Joong, Kipling, Zak, Klotzbach, Philip J, Knaff, John A, Koppa, Akash, Korshunova, Natalia N, Kraemer, Benjamin M, Kramarova, Natalya A, Kruger, AC, Kruger, Andries, Kumar, Arun, L’Heureux, Michelle, La Fuente, Sofia, Laas, Alo, Labe, Zachary M, Lader, Rick, Lakatos, Mónika, Lakkala, Kaisa, Lam, Hoang Phuc, Lan, Xin, Landschützer, Peter, Landsea, Chris W, Lang, Timothy, Lankhorst, Matthias, Lantz, Kathleen O, Lara, Mark J, Lavado-Casimiro, Waldo, Lavers, David A, Lazzara, Matthew A, Leblanc, Thierry, Lee, Tsz-Cheung, Leibensperger, Eric M, Lennard, Chris, Leuliette, Eric, Leung, Kinson HY, Lieser, Jan L, Likso, Tanja, Lin, I-I, Lindsey, Jackie, Liu, Yakun, Locarnini, Ricardo, Loeb, Norman G, Loomis, Bryant D, Lorrey, Andrew M, Loyola, Diego, Lu, Rui, Lumpkin, Rick, Luo, Jing-Jia, Luojus, Kari, Lyman, John M, Maberly, Stephen C, Macander, Matthew J, MacFerrin, Michael, MacGilchrist, Graeme A, MacLennan, Michelle L, Madelon, Remi, Magee, Andrew D, Magnin, Florence, Mamen, Jostein, Mankoff, Ken D, Manney, Gloria L, Marcinonienė, Izolda, Marengo, Jose A, Marjan, Mohammadi, Martínez, Ana E, Massom, Robert A, Matsuzaki, Shin-Ichiro, May, Linda, Mayer, Michael, Mazloff, Matthew R, McAfee, Stephanie A, McBride, C, McCabe, Matthew F, McClelland, James W, McPhaden, Michael J, Mcvicar, Tim R, Mears, Carl A, Meier, Walter N, Mekonnen, A, Menzel, Annette, Merchant, Christopher J, Merrifield, Mark A, Meyer, Michael F, Meyers, Tristan, Mikolajczyk, David E, Miller, John B, Miralles, Diego G, Misevicius, Noelia, Mishonov, Alexey, Mitchum, Gary T, Moat, Ben I, Moesinger, Leander, Moise, Aurel, Molina-Carpio, Jorge, Monet, Ghislaine, Montzka, Stephan A, Moon, Twila A, Moore, GWK, Mora, Natali, Morán, Johnny, Morehen, Claire, Morice, Colin, Mostafa, AE, Mote, Thomas L, Mrekaj, Ivan, Mudryk, Lawrence, Mühle, Jens, Müller, Rolf, Nance, David, Nash, Eric R, Nerem, R Steven, Newman, Paul A, Nicolas, Julien P, Nieto, Juan J, Noetzli, Jeannette, Noll, Ben, Norton, Taylor, Nyland, Kelsey E, O’Keefe, John, Ochwat, Naomi, Oikawa, Yoshinori, Okunaka, Yuka, Osborn, Timothy J, Overland, James E, Park, Taejin, Parrington, Mark, Parrish, Julia K, Pasch, Richard J, Pascual Ramírez, Reynaldo, Pellet, Cécile, Pelto, Mauri S, Perčec Tadić, Melita, Perovich, Donald K, Petersen, Guðrún Nína, Petersen, Kyle, Petropavlovskikh, Irina, Petty, Alek, Pezza, Alexandre B, Pezzi, Luciano P, Phillips, Coda, Phoenix, Gareth K, Pierson, Don, Pinto, Izidine, Pires, Vanda, Pitts, Michael, Po-Chedley, Stephen, Pogliotti, Paolo, Poinar, Kristin, Polvani, Lorenzo, Preimesberger, Wolfgang, Price, Colin, Pulkkanen, Merja, Purkey, Sarah G, Qiu, Bo, Quisbert, Kenny, Quispe, Willy R, Rajeevan, M, Ramos, Andrea M, Randel, William J, Rantanen, Mika, Raphael, Marilyn N, Reagan, James, Recalde, Cristina, Reid, Phillip, Rémy, Samuel, Reyes Kohler, Alejandra J, Ricciardulli, Lucrezia, Richardson, Andrew D, Ricker, Robert, Robinson, David A, Robjhon, M, Rocha, Willy, Rodell, Matthew, Rodriguez Guisado, Esteban, Rodriguez-Fernandez, Nemesio, Romanovsky, Vladimir E, Ronchail, Josyane, Rosencrans, Matthew, Rosenlof, Karen H, Rösner, Benjamin, Rösner, Henrieke, Rozanov, Alexei, Rozkošný, Jozef, Rubek, Frans, Rusanovskaya, Olga O, Rutishauser, This, Sabeerali, CT, Salinas, Roberto, Sánchez-Lugo, Ahira, Santee, Michelle L, Santini, Marcelo, Sato, Katsunari, Sawaengphokhai, Parnchai, Sayouri, A, Scambos, Theodore, Schenzinger, Verena, Schimanke, Semjon, Schlegel, Robert W, Schmid, Claudia, Schmid, Martin, Schneider, Udo, Schreck, Carl J, Schultz, Cristina, _, _, Segele, ZT, Sensoy, Serhat, Serbin, Shawn P, Serreze, Mark C, Setiawan, Amsari Mudzakir, Sezaki, Fumi, Sharma, Sapna, Sharp, Jonathan D, Sheffield, Gay, Shi, Jia-Rui, Shi, Lei, Shiklomanov, Alexander I, Shiklomanov, Nikolay I, Shimaraeva, Svetlana V, Shukla, R, Siegel, David A, Silow, Eugene A, Sima, F, Simmons, Adrian J, Smeed, David A, Smith, Adam, Smith, Sharon L, Soden, Brian J, Sofieva, Viktoria, Souza, Everaldo, Sparks, Tim H, Spence-Hemmings, Jacqueline, Spencer, Robert GM, Spillane, Sandra, Sreejith, OP, Srivastava, AK, Stackhouse, Paul W, Stammerjohn, Sharon, Stauffer, Ryan, Steinbrecht, Wolfgang, Steiner, Andrea K, Stella, Jose L, Stephenson, Tannecia S, Stradiotti, Pietro, Strahan, Susan E, Streletskiy, Dmitry A, Surendran, Divya E, Suslova, Anya, Svendby, Tove, Sweet, William, Takahashi, Kiyotoshi, Takemura, Kazuto, Tank, Suzanne E, Taylor, Michael A, Tedesco, Marco, Thackeray, Stephen J, Thiaw, WM, Thibert, Emmanuel, Thoman, Richard L, Thompson, Andrew F, Thompson, Philip R, Tian-Kunze, Xiangshan, Timmermans, Mary-Louise, Timofeyev, Maxim A, Tobin, Skie, Tømmervik, Hans, Tourpali, Kleareti, Trescilo, Lidia, Tretiakov, Mikhail, Trewin, Blair C, Triñanes, Joaquin A, Trotman, Adrian, Truchelut, Ryan E, Trusel, Luke D, Tye, Mari R, van der A, Ronald, van der Schalie, Robin, van der Schrier, Gerard, Van Meerbeeck, Cedric J, van vliet, Arnold JH, Vazife, Ahad, Verburg, Piet, Vernier, Jean-Paul, Vimont, Isaac J, Virts, Katrina, Vivero, Sebastián, Volkov, Denis L, Vömel, Holger, Vose, Russell S, Walker, Donald A, Walsh, John E, Wang, Bin, Wang, Hui, Wang, Muyin, Wang, Ray HJ, Wang, Xinyue, Wanninkhof, Rik, Warnock, Taran, Weber, Mark, Webster, Melinda, Wehrlé, Adrian, Wen, Caihong, Westberry, Toby K, Widlansky, Matthew J, Wiese, David N, Wild, Jeannette D, Wille, Jonathan D, Willems, An, Willett, Kate M, Williams, Earle, Willis, J, Wong, Takmeng, Wood, Kimberly M, Woolway, Richard Iestyn, Xie, Ping-Ping, Yang, Dedi, Yin, Xungang, Yin, Ziqi, Zeng, Zhenzhong, Zhang, Huai-min, Zhang, Li, Zhang, Peiqun, Zhao, Lin, Zhou, Xinjia, Zhu, Zhiwei, Ziemke, Jerry R, Ziese, Markus, Zolkos, Scott, Zotta, Ruxandra M, Zou, Cheng-Zhi, Allen, Jessicca, Camper, Amy V, Haley, Bridgette O, Hammer, Gregory, Love-Brotak, S Elizabeth, Ohlmann, Laura, Noguchi, Lukas, Riddle, Deborah B, Veasey, Sara W, Boyer, Tim, Bartow-Gillies, Ellen, Abida, A, Ades, Melanie, Adler, Robert, Adusumilli, Susheel, Agyakwah, W, Ahmasuk, Brandon, Aldeco, Laura S, Alexe, Mihai, Alfaro, Eric J, Allan, Richard P, Allgood, Adam, Alves, Lincoln M, Amador, Jorge A, Anderson, John, Andrade, B, Anneville, Orlane, Aono, Yasuyuki, Arguez, Anthony, Arosio, Carlo, Atkinson, C, Augustine, John A, Avalos, Grinia, Azorin-Molina, Cesar, Backensto, Stacia A, Bader, Stephan, Baez, Julian, Baiman, Rebecca, Ballinger, Thomas J, Banwell, Alison F, Bardin, M Yu, Barichivich, Jonathan, Barnes, John E, Barreira, Sandra, Beadling, Rebecca L, Beck, Hylke E, Becker, Emily J, Bekele, E, Bellido, Guillem Martín, Bellouin, Nicolas, Benedetti, Angela, Benestad, Rasmus, Berne, Christine, Berner, Logan T, Bernhard, Germar H, Bhatt, Uma S, Bhuiyan, AE, Bigalke, Siiri, Biló, Tiago, Bissolli, Peter, Bjerke Jarle, W, Blagrave, Kevin, Blake, Eric S, Blenkinsop, Stephen, Blunden, Jessica, Bochníček, Oliver, Bock, Olivier, Bodin, Xavier, Bosilovich, Michael, Boucher, Olivier, Bozkurt, Deniz, Brettschneider, Brian, Bringas, Francis G, Bringas, Francis, Buechler, Dennis, Buehler, Stefan A, Bukunt, Brandon, Calderón, Blanca, Camargo, Suzana J, Campbell, Jayaka, Campos, Diego, Carrea, Laura, Carter, Brendan R, Cetinić, Ivona, Chambers, Don P, Chan, Duo, Chandler, Elise, Chang, Kai-Lan, Chen, Hua, Chen, Lin, Cheng, Lijing, Cheng, Vincent YS, Chomiak, Leah, Christiansen, Hanne H, Christy, John R, Chung, Eui-Seok, Ciasto, Laura M, Clarke, Leonardo, Clem, Kyle R, Clingan, Scott, Coelho, Caio AS, Cohen, Judah L, Coldewey-Egbers, Melanie, Colwell, Steve, Cooper, Owen R, Cornes, Richard C, Correa, Kris, Costa, Felipe, Covey, Curt, Coy, Lawrence, Créatux, Jean-François, Crhova, Lenka, Crimmins, Theresa, Cronin, Meghan F, Cropper, Thomas, Crotwell, Molly, Culpepper, Joshua, Cunha, Ana P, Cusicanqui, Diego, Datta, Rajashree T, Davis, Sean M, De Bock, Veerle, de Jeu, Richard AM, De Laat, Jos, Decharme, Bertrand, Degenstein, Doug, Delaloye, Reynald, Demircan, Mesut, Derksen, Chris, Deus, Ricardo, Dhurmea, KR, Diamond, Howard J, Dirkse, S, Divine, Dmitry, Dokulil, Martin T, Donat, Markus G, Dong, Shenfu, Dorigo, Wouter A, Drost Jensen, Caroline, Druckenmiller, Matthew L, Drumond, Paula, du Plessis, Marcel, Dugan, Hilary A, Dulamsuren, Dashkhuu, Dunmire, Devon, Dunn, Robert JH, Durre, Imke, Dutton, Geoff, Duveiller, Gregory, Ekici, Mithat, Elias Chereque, Alesksandra, ElKharrim, M, Epstein, Howard E, Espinoza, Jhan-Carlo, Estilow, Thomas W, Estrella, Nicole, Fauchereau, Nicolas, Fausto, Robert S, Feely, Richard A, Fenimore, Chris, Fereday, David, Fettweis, Xavier, Fioletov, vitali E, Flemming, Johannes, Fogarty, Chris, Fogt, Ryan L, Forbes, Bruce C, Foster, Michael J, Franz, Bryan A, Freeman, Natalie M, Fricker, Helen A, Frith, Stacey M, Froidevaux, Lucien, Frost, Gerald V, Fuhrman, Steven, Füllekrug, Martin, Ganter, Catherine, Gao, Meng, Gardner, Alex S, Garforth, Judith, Garg, Jay, Gerland, Sebastian, Gibbes, Badin, Gille, Sarah T, Gilson, John, Gleason, Karin, Gobron, Nadine, Goetz, Scott J, Goldenberg, Stanley B, Goni, Gustavo, Goodman, Steven, Goto, Atsushi, Grooß, Jens-Uwe, Gruber, Alexander, Gu, Guojun, Guard, Charles Chip P, Hagos, S, Hahn, Sebastian, Haimberger, Leopold, Hall, Bradley D, Hamlington, Benjamin D, Hanna, Edward, Hanssen-Bauer, Inger, Harnos, Daniel S, Harris, Ian, He, Qiong, Heim, Richard R, Hellström, Sverker, Hemming, Deborah L, Hendricks, Stefan, Hicks, J, Hidalgo, Hugo G, Hirschi, Martin, Ho, Shu-peng, Hobbs, W, Holmes, Robert M, Holzworth, Robert, Hrbáček, Filip, Hu, Guojie, Hu, Zeng-Zhen, Huang, Boyin, Huang, Hongjie, Hurst, Dale F, Ialongo, Iolanda, Inness, Antje, Isaksen, Ketil, Ishii, Masayoshi, Jadra, Gerardo, Jevrejeva, Svetlana, John, Viju O, Johns, W, Johnsen, Bjørn, Johnson, Bryan, Johnson, Gregory C, Jones, Philip D, Jones, Timothy, Josey, Simon A, Jumaux, G, Junod, Robert, Kääb, Andreas, Kabidi, K, Kaiser, Johannes W, Kaler, Robb SA, Kaleschke, Lars, Kaufmann, Viktor, Kazemi, Amin Fazl, Keller, Linda M, Kellerer-Pirklbauer, Andreas, Kendon, Mike, Kennedy, John, Kent, Elizabeth C, Kerr, Kenneth, Khan, Valentina, Khiem, Mai Van, Kidd, Richard, Kim, Mi Ju, Kim, Seong-Joong, Kipling, Zak, Klotzbach, Philip J, Knaff, John A, Koppa, Akash, Korshunova, Natalia N, Kraemer, Benjamin M, Kramarova, Natalya A, Kruger, AC, Kruger, Andries, Kumar, Arun, L’Heureux, Michelle, La Fuente, Sofia, Laas, Alo, Labe, Zachary M, Lader, Rick, Lakatos, Mónika, Lakkala, Kaisa, Lam, Hoang Phuc, Lan, Xin, Landschützer, Peter, Landsea, Chris W, Lang, Timothy, Lankhorst, Matthias, Lantz, Kathleen O, Lara, Mark J, Lavado-Casimiro, Waldo, Lavers, David A, Lazzara, Matthew A, Leblanc, Thierry, Lee, Tsz-Cheung, Leibensperger, Eric M, Lennard, Chris, Leuliette, Eric, Leung, Kinson HY, Lieser, Jan L, Likso, Tanja, Lin, I-I, Lindsey, Jackie, Liu, Yakun, Locarnini, Ricardo, Loeb, Norman G, Loomis, Bryant D, Lorrey, Andrew M, Loyola, Diego, Lu, Rui, Lumpkin, Rick, Luo, Jing-Jia, Luojus, Kari, Lyman, John M, Maberly, Stephen C, Macander, Matthew J, MacFerrin, Michael, MacGilchrist, Graeme A, MacLennan, Michelle L, Madelon, Remi, Magee, Andrew D, Magnin, Florence, Mamen, Jostein, Mankoff, Ken D, Manney, Gloria L, Marcinonienė, Izolda, Marengo, Jose A, Marjan, Mohammadi, Martínez, Ana E, Massom, Robert A, Matsuzaki, Shin-Ichiro, May, Linda, Mayer, Michael, Mazloff, Matthew R, McAfee, Stephanie A, McBride, C, McCabe, Matthew F, McClelland, James W, McPhaden, Michael J, Mcvicar, Tim R, Mears, Carl A, Meier, Walter N, Mekonnen, A, Menzel, Annette, Merchant, Christopher J, Merrifield, Mark A, Meyer, Michael F, Meyers, Tristan, Mikolajczyk, David E, Miller, John B, Miralles, Diego G, Misevicius, Noelia, Mishonov, Alexey, Mitchum, Gary T, Moat, Ben I, Moesinger, Leander, Moise, Aurel, Molina-Carpio, Jorge, Monet, Ghislaine, Montzka, Stephan A, Moon, Twila A, Moore, GWK, Mora, Natali, Morán, Johnny, Morehen, Claire, Morice, Colin, Mostafa, AE, Mote, Thomas L, Mrekaj, Ivan, Mudryk, Lawrence, Mühle, Jens, Müller, Rolf, Nance, David, Nash, Eric R, Nerem, R Steven, Newman, Paul A, Nicolas, Julien P, Nieto, Juan J, Noetzli, Jeannette, Noll, Ben, Norton, Taylor, Nyland, Kelsey E, O’Keefe, John, Ochwat, Naomi, Oikawa, Yoshinori, Okunaka, Yuka, Osborn, Timothy J, Overland, James E, Park, Taejin, Parrington, Mark, Parrish, Julia K, Pasch, Richard J, Pascual Ramírez, Reynaldo, Pellet, Cécile, Pelto, Mauri S, Perčec Tadić, Melita, Perovich, Donald K, Petersen, Guðrún Nína, Petersen, Kyle, Petropavlovskikh, Irina, Petty, Alek, Pezza, Alexandre B, Pezzi, Luciano P, Phillips, Coda, Phoenix, Gareth K, Pierson, Don, Pinto, Izidine, Pires, Vanda, Pitts, Michael, Po-Chedley, Stephen, Pogliotti, Paolo, Poinar, Kristin, Polvani, Lorenzo, Preimesberger, Wolfgang, Price, Colin, Pulkkanen, Merja, Purkey, Sarah G, Qiu, Bo, Quisbert, Kenny, Quispe, Willy R, Rajeevan, M, Ramos, Andrea M, Randel, William J, Rantanen, Mika, Raphael, Marilyn N, Reagan, James, Recalde, Cristina, Reid, Phillip, Rémy, Samuel, Reyes Kohler, Alejandra J, Ricciardulli, Lucrezia, Richardson, Andrew D, Ricker, Robert, Robinson, David A, Robjhon, M, Rocha, Willy, Rodell, Matthew, Rodriguez Guisado, Esteban, Rodriguez-Fernandez, Nemesio, Romanovsky, Vladimir E, Ronchail, Josyane, Rosencrans, Matthew, Rosenlof, Karen H, Rösner, Benjamin, Rösner, Henrieke, Rozanov, Alexei, Rozkošný, Jozef, Rubek, Frans, Rusanovskaya, Olga O, Rutishauser, This, Sabeerali, CT, Salinas, Roberto, Sánchez-Lugo, Ahira, Santee, Michelle L, Santini, Marcelo, Sato, Katsunari, Sawaengphokhai, Parnchai, Sayouri, A, Scambos, Theodore, Schenzinger, Verena, Schimanke, Semjon, Schlegel, Robert W, Schmid, Claudia, Schmid, Martin, Schneider, Udo, Schreck, Carl J, Schultz, Cristina, _, _, Segele, ZT, Sensoy, Serhat, Serbin, Shawn P, Serreze, Mark C, Setiawan, Amsari Mudzakir, Sezaki, Fumi, Sharma, Sapna, Sharp, Jonathan D, Sheffield, Gay, Shi, Jia-Rui, Shi, Lei, Shiklomanov, Alexander I, Shiklomanov, Nikolay I, Shimaraeva, Svetlana V, Shukla, R, Siegel, David A, Silow, Eugene A, Sima, F, Simmons, Adrian J, Smeed, David A, Smith, Adam, Smith, Sharon L, Soden, Brian J, Sofieva, Viktoria, Souza, Everaldo, Sparks, Tim H, Spence-Hemmings, Jacqueline, Spencer, Robert GM, Spillane, Sandra, Sreejith, OP, Srivastava, AK, Stackhouse, Paul W, Stammerjohn, Sharon, Stauffer, Ryan, Steinbrecht, Wolfgang, Steiner, Andrea K, Stella, Jose L, Stephenson, Tannecia S, Stradiotti, Pietro, Strahan, Susan E, Streletskiy, Dmitry A, Surendran, Divya E, Suslova, Anya, Svendby, Tove, Sweet, William, Takahashi, Kiyotoshi, Takemura, Kazuto, Tank, Suzanne E, Taylor, Michael A, Tedesco, Marco, Thackeray, Stephen J, Thiaw, WM, Thibert, Emmanuel, Thoman, Richard L, Thompson, Andrew F, Thompson, Philip R, Tian-Kunze, Xiangshan, Timmermans, Mary-Louise, Timofeyev, Maxim A, Tobin, Skie, Tømmervik, Hans, Tourpali, Kleareti, Trescilo, Lidia, Tretiakov, Mikhail, Trewin, Blair C, Triñanes, Joaquin A, Trotman, Adrian, Truchelut, Ryan E, Trusel, Luke D, Tye, Mari R, van der A, Ronald, van der Schalie, Robin, van der Schrier, Gerard, Van Meerbeeck, Cedric J, van vliet, Arnold JH, Vazife, Ahad, Verburg, Piet, Vernier, Jean-Paul, Vimont, Isaac J, Virts, Katrina, Vivero, Sebastián, Volkov, Denis L, Vömel, Holger, Vose, Russell S, Walker, Donald A, Walsh, John E, Wang, Bin, Wang, Hui, Wang, Muyin, Wang, Ray HJ, Wang, Xinyue, Wanninkhof, Rik, Warnock, Taran, Weber, Mark, Webster, Melinda, Wehrlé, Adrian, Wen, Caihong, Westberry, Toby K, Widlansky, Matthew J, Wiese, David N, Wild, Jeannette D, Wille, Jonathan D, Willems, An, Willett, Kate M, Williams, Earle, Willis, J, Wong, Takmeng, Wood, Kimberly M, Woolway, Richard Iestyn, Xie, Ping-Ping, Yang, Dedi, Yin, Xungang, Yin, Ziqi, Zeng, Zhenzhong, Zhang, Huai-min, Zhang, Li, Zhang, Peiqun, Zhao, Lin, Zhou, Xinjia, Zhu, Zhiwei, Ziemke, Jerry R, Ziese, Markus, Zolkos, Scott, Zotta, Ruxandra M, Zou, Cheng-Zhi, Allen, Jessicca, Camper, Amy V, Haley, Bridgette O, Hammer, Gregory, Love-Brotak, S Elizabeth, Ohlmann, Laura, Noguchi, Lukas, Riddle, Deborah B, and Veasey, Sara W
Abstract: Abstract —J. BLUNDEN, T. BOYER, AND E. BARTOW-GILLIES Earth’s global climate system is vast, complex, and intricately interrelated. Many areas are influenced by global-scale phenomena, including the “triple dip” La Niña conditions that prevailed in the eastern Pacific Ocean nearly continuously from mid-2020 through all of 2022; by regional phenomena such as the positive winter and summer North Atlantic Oscillation that impacted weather in parts the Northern Hemisphere and the negative Indian Ocean dipole that impacted weather in parts of the Southern Hemisphere; and by more localized systems such as high-pressure heat domes that caused extreme heat in different areas of the world. Underlying all these natural short-term variabilities are long-term climate trends due to continuous increases since the beginning of the Industrial Revolution in the atmospheric concentrations of Earth’s major greenhouse gases. In 2022, the annual global average carbon dioxide concentration in the atmosphere rose to 417.1±0.1 ppm, which is 50% greater than the pre-industrial level. Global mean tropospheric methane abundance was 165% higher than its pre-industrial level, and nitrous oxide was 24% higher. All three gases set new record-high atmospheric concentration levels in 2022. Sea-surface temperature patterns in the tropical Pacific characteristic of La Niña and attendant atmospheric patterns tend to mitigate atmospheric heat gain at the global scale, but the annual global surface temperature across land and oceans was still among the six highest in records dating as far back as the mid-1800s. It was the warmest La Niña year on record. Many areas observed record or near-record heat. Europe as a whole observed its second-warmest year on record, with sixteen individual countries observing record warmth at the national scale. Records were shattered across the continent during the summer months as heatwaves
Published: 2023

22. Sea ice and snow characteristics from year-long transects at the MOSAiC Central Observatory

Author: Itkin, Polona, Hendricks, Stefan, Webster, Melinda, von Albedyll, Luisa, Arndt, Stefanie, Divine, Dmitry, Jaggi, Matthias, Oggier, Marc, Raphael, Ian, Ricker, Robert, Rohde, Jan, Schneebeli, Martin, Liston, Glen E, Itkin, Polona, Hendricks, Stefan, Webster, Melinda, von Albedyll, Luisa, Arndt, Stefanie, Divine, Dmitry, Jaggi, Matthias, Oggier, Marc, Raphael, Ian, Ricker, Robert, Rohde, Jan, Schneebeli, Martin, and Liston, Glen E
Abstract: Repeated transects have become the backbone of spatially distributed ice and snow thickness measurements crucial for understanding of ice mass balance. Here we detail the transects at the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) 2019-2020, which represent the first such measurements collected across an entire season. Compared with similar historical transects, the snow at MOSAiC was thin (mean depths of approximately 0.1-0.3 m), while the sea ice was relatively thick first-year ice (FYI) and second-year ice (SYI). SYI was of two distinct types: relatively thin level ice formed from surfaces with extensive melt pond cover, and relatively thick deformed ice. On level SYI, spatial signatures of refrozen melt ponds remained detectable in January. At the beginning of winter the thinnest ice also had the thinnest snow, with winter growth rates of thin ice (0.33 m month-1 for FYI, 0.24 m month-1 for previously ponded SYI) exceeding that of thick ice (0.2 m month-1). By January, FYI already had a greater modal ice thickness (1.1 m) than previously ponded SYI (0.9 m). By February, modal thickness of all SYI and FYI became indistinguishable at about 1.4 m. The largest modal thicknesses were measured in May at 1.7 m. Transects included deformed ice, where largest volumes of snow accumulated by April. The remaining snow on level ice exhibited typical spatial heterogeneity in the form of snow dunes. Spatial correlation length scales for snow and sea ice ranged from 20 to 40 m or 60 to 90 m, depending on the sampling direction, which suggests that the known anisotropy of snow dunes also manifests in spatial patterns in sea ice thickness. The diverse snow and ice thickness data obtained from the MOSAiC transects represent an invaluable resource for model and remote sensing product development.
Published: 2023

23. The Arctic

Author: Moon, TA, Thoman, R, Druckenmiller, ML, Ahmasuk, Brandon, Backensto, Stacia A, Ballinger, Thomas J, Benestad, Rasmus, Berner, Logan T, Bernhard, Germar H, Bhatt, Uma S, Bigalke, Siiri, BjerkeJarle, W, Brettschneider, Brian, Christiansen, Hanne H, Cohen, Judah L, Decharme, Bertrand, Derksen, Chris, Divine, Dmitry, Drost, Jensen, Druckenmiller, Matthew L, EliasChereque, Alesksandra, Epstein, Howard E, Fausto, Robert S, Fettweis, Xavier, Fioletov, Vitali E, Forbes, Bruce C, Frost, Gerald V, Gerland, Sebastian, Goetz, Scott J, Grooß, Jens-Uwe, Hanna, Edward, Hanssen-Bauer, Inger, Hendricks, Stefan, Holmes, Robert M, Ialongo, Iolanda, Isaksen, Ketil, Johnsen, Bjørn, Jones, Timothy, Kaler, Robb SA, Kaleschke, Lars, Kim, Seong-Joong, Labe, Zachary M, Lader, Rick, Lakkala, Kaisa, Lara, Mark J, Lindsey, Jackie, Loomis, Bryant D, Luojus, Kari, Macander, Matthew J, Mamen, Jostein, Mankoff, Ken D, Manney, Gloria L, McAfee, Stephanie A, McClelland, James W, Meier, Walter N, Moon, Twila A, Moore, GWK, Mote, Thomas L, Mudryk, Lawrence, Müller, Rolf, Nyland, Kelsey E, Overland, James E, Parrish, Julia K, Perovich, Donald K, Petersen, Guðrún Nína, Petty, Alek, Phoenix, Gareth K, Poinar, Kristin, Rantanen, Mika, Ricker, Robert, Romanovsky, Vladimir E, Serbin, Shawn P, Serreze, Mark C, Sheffield, Gay, Shiklomanov, Alexander I, Shiklomanov, Nikolay I, Smith, Sharon L, Spencer, Robert GM, Streletskiy, Dmitry A, Suslova, Anya, Svendby, Tove, Tank, Suzanne E, Tedesco, Marco, Thoman, Richard L, Tian-Kunze, Xiangshan, Timmermans, Mary-Louise, Tømmervik, Hans, Tretiakov, Mikhail, Walker, Donald A, Walsh, John E, Wang, Muyin, Webster, Melinda, Wehrlé, Adrian, Yang, Dedi, Zolkos, Scott, Allen, Jessicca, Camper, Amy V, Haley, Bridgette O, Hammer, Gregory, Love-Brotak, S, Ohlmann, Laura, Noguchi, Lukas, Riddle, Deborah B, Veasey, Sara W, Moon, TA, Thoman, R, Druckenmiller, ML, Ahmasuk, Brandon, Backensto, Stacia A, Ballinger, Thomas J, Benestad, Rasmus, Berner, Logan T, Bernhard, Germar H, Bhatt, Uma S, Bigalke, Siiri, BjerkeJarle, W, Brettschneider, Brian, Christiansen, Hanne H, Cohen, Judah L, Decharme, Bertrand, Derksen, Chris, Divine, Dmitry, Drost, Jensen, Druckenmiller, Matthew L, EliasChereque, Alesksandra, Epstein, Howard E, Fausto, Robert S, Fettweis, Xavier, Fioletov, Vitali E, Forbes, Bruce C, Frost, Gerald V, Gerland, Sebastian, Goetz, Scott J, Grooß, Jens-Uwe, Hanna, Edward, Hanssen-Bauer, Inger, Hendricks, Stefan, Holmes, Robert M, Ialongo, Iolanda, Isaksen, Ketil, Johnsen, Bjørn, Jones, Timothy, Kaler, Robb SA, Kaleschke, Lars, Kim, Seong-Joong, Labe, Zachary M, Lader, Rick, Lakkala, Kaisa, Lara, Mark J, Lindsey, Jackie, Loomis, Bryant D, Luojus, Kari, Macander, Matthew J, Mamen, Jostein, Mankoff, Ken D, Manney, Gloria L, McAfee, Stephanie A, McClelland, James W, Meier, Walter N, Moon, Twila A, Moore, GWK, Mote, Thomas L, Mudryk, Lawrence, Müller, Rolf, Nyland, Kelsey E, Overland, James E, Parrish, Julia K, Perovich, Donald K, Petersen, Guðrún Nína, Petty, Alek, Phoenix, Gareth K, Poinar, Kristin, Rantanen, Mika, Ricker, Robert, Romanovsky, Vladimir E, Serbin, Shawn P, Serreze, Mark C, Sheffield, Gay, Shiklomanov, Alexander I, Shiklomanov, Nikolay I, Smith, Sharon L, Spencer, Robert GM, Streletskiy, Dmitry A, Suslova, Anya, Svendby, Tove, Tank, Suzanne E, Tedesco, Marco, Thoman, Richard L, Tian-Kunze, Xiangshan, Timmermans, Mary-Louise, Tømmervik, Hans, Tretiakov, Mikhail, Walker, Donald A, Walsh, John E, Wang, Muyin, Webster, Melinda, Wehrlé, Adrian, Yang, Dedi, Zolkos, Scott, Allen, Jessicca, Camper, Amy V, Haley, Bridgette O, Hammer, Gregory, Love-Brotak, S, Ohlmann, Laura, Noguchi, Lukas, Riddle, Deborah B, and Veasey, Sara W
Published: 2023

24. Heat stored in the Earth system 1960–2020: Where does the energy go?

Author: Von Schuckmann, Karina, Minère, Audrey, Gues, Flora, Cuesta-valero, Francisco José, Kirchengast, Gottfried, Adusumilli, Susheel, Straneo, Fiammetta, Allan, Richard, Barker, Paul M., Beltrami, Hugo, Boyer, Tim, Cheng, Lijing, Church, John, Desbruyeres, Damien, Dolman, Han, Domingues, Catia M., García-garcía, Almudena, Giglio, Donata, Gilson, John E., Gorfer, Maximilian, Haimberger, Leopold, Hendricks, Stefan, Hosoda, Shigeki, Johnson, Gregory C., Killick, Rachel, King, Brian, Kolodziejczyk, Nikolas, Korosov, Anton, Krinner, Gerhard, Kuusela, Mikael, Langer, Moritz, Lavergne, Thomas, Lawrence, Isobel, Li, Yuehua, Lyman, John, Marzeion, Ben, Mayer, Michael, Macdougall, Andrew H., Mcdougall, Trevor, Monselesan, Didier Paolo, Nitzbon, Jan, Otosaka, Inès, Peng, Jian, Purkey, Sarah, Roemmich, Dean, Sato, Kanako, Sato, Katsunari, Savita, Abhishek, Schweiger, Axel, Shepherd, Andrew, Seneviratne, Sonia I., Simons, Leon, Slater, Donald A., Slater, Thomas, Smith, Noah, Steiner, Andrea, Suga, Toshio, Szekely, Tanguy, Thiery, Wim, Timmermans, Mary-louise, Vanderkelen, Inne, Wjiffels, Susan E., Wu, Tonghua, Zemp, Michael, Von Schuckmann, Karina, Minère, Audrey, Gues, Flora, Cuesta-valero, Francisco José, Kirchengast, Gottfried, Adusumilli, Susheel, Straneo, Fiammetta, Allan, Richard, Barker, Paul M., Beltrami, Hugo, Boyer, Tim, Cheng, Lijing, Church, John, Desbruyeres, Damien, Dolman, Han, Domingues, Catia M., García-garcía, Almudena, Giglio, Donata, Gilson, John E., Gorfer, Maximilian, Haimberger, Leopold, Hendricks, Stefan, Hosoda, Shigeki, Johnson, Gregory C., Killick, Rachel, King, Brian, Kolodziejczyk, Nikolas, Korosov, Anton, Krinner, Gerhard, Kuusela, Mikael, Langer, Moritz, Lavergne, Thomas, Lawrence, Isobel, Li, Yuehua, Lyman, John, Marzeion, Ben, Mayer, Michael, Macdougall, Andrew H., Mcdougall, Trevor, Monselesan, Didier Paolo, Nitzbon, Jan, Otosaka, Inès, Peng, Jian, Purkey, Sarah, Roemmich, Dean, Sato, Kanako, Sato, Katsunari, Savita, Abhishek, Schweiger, Axel, Shepherd, Andrew, Seneviratne, Sonia I., Simons, Leon, Slater, Donald A., Slater, Thomas, Smith, Noah, Steiner, Andrea, Suga, Toshio, Szekely, Tanguy, Thiery, Wim, Timmermans, Mary-louise, Vanderkelen, Inne, Wjiffels, Susan E., Wu, Tonghua, and Zemp, Michael
Abstract: The Earth climate system is out of energy balance and heat has accumulated continuously over the past decades, warming the ocean, the land, the cryosphere and the atmosphere. According to the 6th Assessment Report of the Intergovernmental Panel on Climate Change, this planetary warming over multiple decades is human-driven and results in unprecedented and committed changes to the Earth system, with adverse impacts for ecosystems and human systems. The Earth heat inventory provides a measure of the Earth energy imbalance, and allows for quantifying how much heat has accumulated in the Earth system, and where the heat is stored. Here we show that 380 ± 62 ZJ of heat has accumulated in the Earth system from 1971 to 2020, at a rate of 0.48 ± 0.1 W m−2, with 89 ± 17 % of this heat stored in the ocean, 6 ± 0.1 % on land, 4 ± 1 % in the cryosphere and 1 ± 0.2 % in the atmosphere. Over the most recent decade (2006–2020), the Earth heat inventory shows increased warming at rate of 0.48 ± 0.3 W m−2/decade, and the Earth climate system is out of energy balance by 0.76 ± 0.2 Wm−2. The Earth heat inventory is the most fundamental global climate indicator that the scientific community and the public can use as the measure of how well the world is doing in the task of bringing anthropogenic climate change under control. We call for an implementation of the Earth heat inventory into the Paris agreement’s global stocktake based on best available science. The Earth heat inventory in this study, updated from von Schuckmann et al, 2020, is underpinned by worldwide multidisciplinary collaboration and demonstrates the critical importance of concerted international efforts for climate change monitoring and community-based recommendations as coordinated by the Global Climate Observing System (GCOS). We also call for urgently needed actions for enabling continuity, archiving, rescuing and calibrating efforts to assure improved and long-term monitoring capacity of the relevant GCOS Essential
Published: 2023
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25. MOSAiC airborne laser scanning of the sea-ice surface: data product overview and insights to seasonal roughness evolution

Author: Jutila, Arttu Juhani, Hutter, Nils, Hendricks, Stefan, Ricker, Robert, Albedyll, Luisa, Birnbaum, Gerit, Haas, Christian, Jutila, Arttu Juhani, Hutter, Nils, Hendricks, Stefan, Ricker, Robert, Albedyll, Luisa, Birnbaum, Gerit, and Haas, Christian
Abstract: Oral presentation at the 2nd MOSAiC science conference showing the MOSAiC airborne laser scanner product overview and first results of seasonal surface roughness
Published: 2023

26. Retrieval of Snow Depth on Arctic Sea Ice From Surface‐Based, Polarimetric, Dual‐Frequency Radar Altimetry

Author: Sub Dynamics Meteorology, Marine and Atmospheric Research, Willatt, Rosemary, Stroeve, Julienne, Nandan, Vishnu, Newman, Thomas, Mallett, Robbie, Hendricks, Stefan, Ricker, Robert, Mead, James, Itkin, Polona, Tonboe, Rasmus, Wagner, David Nicholas, Spreen, Gunnar, Liston, Glen, Schneebeli, Martin, Krampe, Daniela, Tsamados, Michel, Demir, Oguz, Wilkinson, Jeremy, Jaggi, Matthias, Zhou, Lu, Huntemann, Marcus, Raphael, Ian A., Jutila, Arttu, Oggier, Marc, Sub Dynamics Meteorology, Marine and Atmospheric Research, Willatt, Rosemary, Stroeve, Julienne, Nandan, Vishnu, Newman, Thomas, Mallett, Robbie, Hendricks, Stefan, Ricker, Robert, Mead, James, Itkin, Polona, Tonboe, Rasmus, Wagner, David Nicholas, Spreen, Gunnar, Liston, Glen, Schneebeli, Martin, Krampe, Daniela, Tsamados, Michel, Demir, Oguz, Wilkinson, Jeremy, Jaggi, Matthias, Zhou, Lu, Huntemann, Marcus, Raphael, Ian A., Jutila, Arttu, and Oggier, Marc
Published: 2023

27. SMOS sea ice product: Operational application and validation in the Barents Sea marginal ice zone

Author: Kaleschke, Lars, Tian-Kunze, Xiangshan, Maaß, Nina, Beitsch, Alexander, Wernecke, Andreas, Miernecki, Maciej, Müller, Gerd, Fock, Björn H., Gierisch, Andrea M.U., Schlünzen, K. Heinke, Pohlmann, Thomas, Dobrynin, Mikhail, Hendricks, Stefan, Asseng, Jölund, Gerdes, Rüdiger, Jochmann, Peter, Reimer, Nils, Holfort, Jürgen, Melsheimer, Christian, Heygster, Georg, Spreen, Gunnar, Gerland, Sebastian, King, Jennifer, Skou, Niels, Søbjærg, Sten Schmidl, Haas, Christian, Richter, Friedrich, and Casal, Tânia
Published: 2016
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28. Arctic warming interrupts the Transpolar Drift and affects long-range transport of sea ice and ice-rafted matter

Author: Krumpen, Thomas, Belter, H. Jakob, Boetius, Antje, Damm, Ellen, Haas, Christian, Hendricks, Stefan, Nicolaus, Marcel, Nöthig, Eva-Maria, Paul, Stephan, Peeken, Ilka, Ricker, Robert, and Stein, Rüdiger
Published: 2019
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29. SMOS-derived Antarctic thin sea-ice thickness: data description and validation in the Weddell Sea.

Author: Kaleschke, Lars, Xiangshan Tian-Kunze, Hendricks, Stefan, and Ricker, Robert
Subjects: SEA ice, SPHERICAL projection, BRIGHTNESS temperature, STANDARD deviations, THICKNESS measurement, ANTARCTIC ice
Abstract: Accurate satellite measurements of the thickness of Antarctic sea ice are urgently needed but pose a particular challenge. The Antarctic data presented here were produced using a method to derive the sea-ice thickness from 1.4 GHz brightness temperatures previously developed for the Arctic, with only modified auxiliary data. The ability to observe thin sea-ice thicknesses using this method is limited to cold conditions, meaning it is only reasonable during the freezing period, typically March to October. The SMOS level 3 sea-ice thickness product contains estimates of the sea-ice thickness and its uncertainty up to a thickness of about 1 m. The sea-ice thickness is provided as daily average on a polar stereographic projection grid with a sample resolution of 12.5 km, while the SMOS brightness temperature data used has a footprint size of about 35- 40 km in diameter. Data from SMOS have been available since 2010, and the mission’s operation has been extended to continue until at least the end of 2025. Here we compare two versions of the SMOS Antarctic sea-ice thickness product which are based on different level 1 input data (v3.2 based on SMOS L1C v620, and v3.3 based on SMOS L1C 724). A validation is performed to generate a first baseline reference for future improvements of the retrieval algorithm and synergies with other sensors. Sea-ice thickness measurements to validate the SMOS product are particularly rare in Antarctica, especially during the winter season and for the valid range of thicknesses. From the available validation measurements, we selected datasets from the Weddell Sea that have varying degrees of representativeness: Helicopter-based EM Bird (HEM), Surface and Under-Ice Trawl (SUIT), and stationary Upward-Looking Sonars (ULS). While the helicopter can measure hundreds of kilometers, the SUIT’s use is limited to distances of a few kilometers and thus only captures a small fraction of an SMOS footprint. Compared to SMOS, the ULS are point measurements and multi-year time series are necessary to enable a statistically representative comparison. Only four of the ULS moorings have a temporal overlap with SMOS in the year 2010. Based on selected averaged HEM flights and monthly ULS climatologies we find a small mean difference (bias) of less than 10 cm and a root-mean-square deviation of about 20 cm with a correlation coefficient R>0.9 for the valid sea-ice thickness range between zero and about one meter. The SMOS sea-ice thickness showed an underestimate of about 40 cm with respect to the less representative SUIT validation data in the marginal ice zone. Compared with sea-ice thickness outside the valid range we find that SMOS strongly underestimates the real values which underlines the need for combination with other sensors such as altimeters. [ABSTRACT FROM AUTHOR]
Published: 2023
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30. High resolution maps of the sub-ice platelet layer in Atka Bay from electromagnetic induction sounding

Author: Neudert, Mara, primary, Arndt, Stefanie, additional, Schulze, Markus, additional, Hendricks, Stefan, additional, and Haas, Christian, additional
Published: 2023
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31. Monitoring Arctic thin ice: a comparison between CryoSat-2 SAR altimetry data and MODIS thermal-infrared imagery

Author: Müller, Felix L., primary, Paul, Stephan, additional, Hendricks, Stefan, additional, and Dettmering, Denise, additional
Published: 2023
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32. Sea ice and snow characteristics from year-long transects at the MOSAiC Central Observatory

Author: Itkin, Polona, primary, Hendricks, Stefan, additional, Webster, Melinda, additional, von Albedyll, Luisa, additional, Arndt, Stefanie, additional, Divine, Dmitry, additional, Jaggi, Matthias, additional, Oggier, Marc, additional, Raphael, Ian, additional, Ricker, Robert, additional, Rohde, Jan, additional, Schneebeli, Martin, additional, and Liston, Glen E., additional
Published: 2023
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33. Sea Ice-thickness product iNter-comparison eXerciSe – The ESA SIN’XS project

Author: Da Silva, Elodie, Haas, Christian, Fleury, Sara, Hendricks, Stefan, Paul, Stephan, Tsamados, Michel, Munesa, Eric, and Pastor, Javier
Abstract: The SIN’XS project is a three-year activity (May 2022 – May 2025) funded by ESA in the frame of the Polar Science Cluster.In light of rapid changes of the Arctic and Antarctic sea ice cover, continued and improved observations, understanding, and predictions of its thickness are particularly important for a range of fields from climate studies to offshore operations in ice. Systematic and accurate ice thickness observations are now available from several satellite missions. However, they differ in used processing algorithms and assumptions, temporal and spatial coverage and resolution, and applicability to stakeholder needs like modelling and assimilation, numerical weather prediction, and ship routing. These differences between products have so far complicated the consistent use of the various data products and there is little consensus about Arctic and Antarctic Sea ice volume variability and change. The Sea Ice-thickness product iNter-comparison eXerciSe (SIN’XS) will identify some of these gaps by carrying out in-depth intercomparisons of a wide range of satellite ice thickness products from altimetry and other methods, in close collaboration with an international community of scientific and operational sea ice experts, and in partnership with the WMO Global Cryosphere Watch (GCW).It will develop joint protocols for the intercomparison of ice thickness products and their validation, based on established approaches from the QA4EO project and by further developing a framework for Fiducial Reference Measurements (FRMs). SIN’XS will develop an online system to engage the community with data submission and to support scientific analysis of the data sets and intercomparisons., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Published: 2023

34. Observing Arctic thin ice: A comparison between Cryosat-2 altimetry data and thermal imagery from MODIS

Author: Müller, Felix, Paul, Stephan, Hendricks, Stefan, and Dettmering, Denise
Abstract: Leads are not permanently open, but are partially frozen and covered by a thin layer of ice up to about 25 cm thick. This thin ice layer is a hotspot for ocean ventilation as well as for the exchange of heat and moisture between the ocean and the atmosphere. Usually, satellite altimetry is used to determine sea level and its changes. In order to monitor the sea level in the polar oceans, methods have been published in recent years that can detect leads by analysing the shape and backscatter properties of altimeter radar echoes (i.e. waveforms). Here we present an extension of an unsupervised waveform classification of Cryosat-2 SAR observations to identify thin ice surfaces and delineate them from ice-free areas as well as from thicker ice. The unsupervised classification approach identifies similar patterns among a subset of randomly collected waveforms and groups them into a specific number of classes without the use of training data. The classification results are visually compared with thin ice thickness estimates from MODIS-observed ice-surface temperatures and Sentinel-1A/B SAR imagery for co-located datasets. In addition, the waveform derived shape and backscatter parameters are analysed with respect to changing thin ice thickness, revealing strong linear dependencies.The analyses can be used to improve altimeter range estimation and thus to allow for a more reliable determination of the sea surface height in the ice-covered oceans as well as a deeper understanding of the Arctic ice cover., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Published: 2023

35. Retrieval of porous sea ice properties from multifrequency electromagnetic measurements

Author: Neudert, Mara, Hendricks, Stefan, Arndt, Stefanie, and Haas, Christian
Abstract: The porosity of sea ice is a crucial property for understanding processes and feedback mechanisms of the polar-climate system, as it strongly affects the physical, ecological, and biogeochemical properties of sea ice. Sea ice porosity is also closely related to surface flooding and the solid fraction of platelet ice in Antarctica.A direct method for measuring sea ice porosity is electromagnetic (EM) induction sounding, which can be applied on the ground or from airborne platforms. We present advancements in data collection, calibration, and inversion procedures. In this study, we modified the Phyton EMagPy API for fast and adaptable inversion of sea ice surveys and use inverted EM data to study the porosity of sea ice in the Arctic and Antarctic.Over Arctic summer sea, we retrieve the macro-scale porosity of rotten ice and the salinity and depth evolution of melt ponds. The salinity and porosity evolution could be reproduced with varying success, but the addition of several layers in the inversion improved the thickness information compared to a single-layer subsurface model, affecting ice mass balance.For high-resolution EM data over Antarctic fast ice we retrieve the thickness and solid fraction of a variable sub-ice platelet layer below the solid sea ice. The inverted thicknesses of sea ice and the platelet layer as well as their conductivities are in good agreement with independent, coincident in-situ drill hole and CTD measurements., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Published: 2023

36. Product User Guide & Algorithm Specification: AWI CryoSat-2 Sea Ice Thickness (version 2.5)

Author: Hendricks, Stefan and Paul, Stephan
Subjects: remote sensing, Arctic, earth observation, cryosphere, sea ice
Abstract: This document provides an overview of all aspects of the CryoSat-2 Arctic sea-ice thickness data product (version 2.5) generated at the Alfred Wegener Institute Helmholtz Center for Polar and Marine Research (AWI). It contains information on the primary and auxiliary data sets used in the processing, the description of the algorithm used to derive geophysical information along orbit segments and on space-time grids, the technical specifications of the product files, information on data access, as well as the known issues of the data record.
Published: 2022
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37. A comparison between Envisat and ICESat sea ice thickness in the Southern Ocean

Author: Wang, Jinfei, primary, Min, Chao, additional, Ricker, Robert, additional, Shi, Qian, additional, Han, Bo, additional, Hendricks, Stefan, additional, Wu, Renhao, additional, and Yang, Qinghua, additional
Published: 2022
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38. Rain on snow (ROS) understudied in sea ice remote sensing: a multi-sensor analysis of ROS during MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate)

Author: Stroeve, Julienne, primary, Nandan, Vishnu, additional, Willatt, Rosemary, additional, Dadic, Ruzica, additional, Rostosky, Philip, additional, Gallagher, Michael, additional, Mallett, Robbie, additional, Barrett, Andrew, additional, Hendricks, Stefan, additional, Tonboe, Rasmus, additional, McCrystall, Michelle, additional, Serreze, Mark, additional, Thielke, Linda, additional, Spreen, Gunnar, additional, Newman, Thomas, additional, Yackel, John, additional, Ricker, Robert, additional, Tsamados, Michel, additional, Macfarlane, Amy, additional, Hannula, Henna-Reetta, additional, and Schneebeli, Martin, additional
Published: 2022
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39. Lead fractions from SAR-derived sea ice divergence during MOSAiC.

Author: von Albedyll, Luisa, Hendricks, Stefan, Hutter, Nils, Murashkin, Dmitrii, Kaleschke, Lars, Willmes, Sascha, Thielke, Linda, Tian-Kunze, Xiangshan, Spreen, Gunnar, and Haas, Christian
Abstract: Leads and fractures in sea ice play a crucial role in the heat and gas exchange between the ocean and atmosphere, impacting atmospheric, ecological, and oceanic processes. Our aim was to estimate lead fractions from high-resolution divergence obtained from satellite synthetic-aperture radar (SAR) data and to evaluate it against existing lead products. We derived two new leadfraction products from divergence with a spatial resolution of 700m calculated from daily Sentinel-1 images. For the first lead product, we advected and accumulated the lead fractions of individual time steps. With those accumulated divergence-derived lead fractions, we described comprehensively the presence of up to 10-day-old leads and analyzed their deformation history. For the second lead product, we used only divergence pixels that were identified as part of linear kinematic features (LKFs). Both new lead products accurately captured the formation of new leads with widths of a few hundred meters. We presented a Lagrangian time series of the divergence-based lead fractions along the drift of the MOSAiC expedition in the central Arctic Ocean during winter 2019/2020. Lead activity was high in fall and spring, consistent with wind forcing and ice pack consolidation. At larger scales of 50-150 km around the MOSAiC expedition, lead activity on all scales was similar, but differences emerged at smaller scales (10 km). We compared our lead products with 6 others from satellite and airborne sources, including classified SAR, thermal infrared, microwave radiometer, and altimeter data. We found that the mean lead fractions varied by 1 magnitude across different lead products due to different physical lead and sea ice properties observed by the sensors and methodological factors such as spatial resolution. Thus, the choice of lead product should align with the specific application. [ABSTRACT FROM AUTHOR]
Published: 2023
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40. Heat stored in the Earth system 1960–2020: Where does the energy go?

Author: von Schuckmann, Karina, primary, Minère, Audrey, additional, Gues, Flora, additional, Cuesta-Valero, Francisco José, additional, Kirchengast, Gottfried, additional, Adusumilli, Susheel, additional, Straneo, Fiammetta, additional, Allan, Richard, additional, Barker, Paul M., additional, Beltrami, Hugo, additional, Boyer, Tim, additional, Cheng, Lijing, additional, Church, John, additional, Desbruyeres, Damien, additional, Dolman, Han, additional, Domingues, Catia M., additional, García-García, Almudena, additional, Giglio, Donata, additional, Gilson, John E., additional, Gorfer, Maximilian, additional, Haimberger, Leopold, additional, Hendricks, Stefan, additional, Hosoda, Shigeki, additional, Johnson, Gregory C., additional, Killick, Rachel, additional, King, Brian, additional, Kolodziejczyk, Nikolas, additional, Korosov, Anton, additional, Krinner, Gerhard, additional, Kuusela, Mikael, additional, Langer, Moritz, additional, Lavergne, Thomas, additional, Lawrence, Isobel, additional, Li, Yuehua, additional, Lyman, John, additional, Marzeion, Ben, additional, Mayer, Michael, additional, MacDougall, Andrew H., additional, McDougall, Trevor, additional, Monselesan, Didier Paolo, additional, Nitzbon, Jan, additional, Otosaka, Inès, additional, Peng, Jian, additional, Purkey, Sarah, additional, Roemmich, Dean, additional, Sato, Kanako, additional, Sato, Katsunari, additional, Savita, Abhishek, additional, Schweiger, Axel, additional, Shepherd, Andrew, additional, Seneviratne, Sonia I., additional, Simons, Leon, additional, Slater, Donald A., additional, Slater, Thomas, additional, Smith, Noah, additional, Steiner, Andrea, additional, Suga, Toshio, additional, Szekely, Tanguy, additional, Thiery, Wim, additional, Timmermans, Mary-Louise, additional, Vanderkelen, Inne, additional, Wjiffels, Susan E., additional, Wu, Tonghua, additional, and Zemp, Michael, additional
Published: 2022
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41. The Arctic

Author: Thoman, Richard L., primary, Druckenmiller, Matthew L., additional, Moon, Twila A., additional, Andreassen, L. M., additional, Baker, E., additional, Ballinger, Thomas J., additional, Berner, Logan T., additional, Bernhard, Germar H., additional, Bhatt, Uma S., additional, Bjerke, Jarle W., additional, Boisvert, L.N., additional, Box, Jason E., additional, Brettschneider, B., additional, Burgess, D., additional, Butler, Amy H., additional, Cappelen, John, additional, Christiansen, Hanne H., additional, Decharme, B., additional, Derksen, C., additional, Divine, Dmitry, additional, Drozdov, D. S., additional, Elias, Chereque A., additional, Epstein, Howard E., additional, Farrell, Sinead L., additional, Fausto, Robert S., additional, Fettweis, Xavier, additional, Fioletov, Vitali E., additional, Forbes, Bruce C., additional, Frost, Gerald V., additional, Gerland, Sebastian, additional, Goetz, Scott J., additional, Grooß, Jens-Uwe, additional, Haas, Christian, additional, Hanna, Edward, additional, Hanssen, -Bauer Inger, additional, Heijmans, M. M. P. D., additional, Hendricks, Stefan, additional, Ialongo, Iolanda, additional, Isaksen, K., additional, Jensen, C. D., additional, Johnsen, Bjørn, additional, Kaleschke, L., additional, Kholodov, A. L., additional, Kim, Seong-Joong, additional, Kohler, J., additional, Korsgaard, Niels J., additional, Labe, Zachary, additional, Lakkala, Kaisa, additional, Lara, Mark J., additional, Lee, Simon H., additional, Loomis, Bryant, additional, Luks, B., additional, Luojus, K., additional, Macander, Matthew J., additional, Magnússon, R. Í, additional, Malkova, G. V., additional, Mankoff, Kenneth D., additional, Manney, Gloria L., additional, Meier, Walter N., additional, Mote, Thomas, additional, Mudryk, Lawrence, additional, Müller, Rolf, additional, Nyland, K. E., additional, Overland, James E., additional, Pálsson, F., additional, Park, T., additional, Parker, C. L., additional, Perovich, Don, additional, Petty, Alek, additional, Phoenix, Gareth K., additional, Pinzon, J. E., additional, Ricker, Robert, additional, Romanovsky, Vladimir E., additional, Serbin, S. P., additional, Sheffield, G., additional, Shiklomanov, Nikolai I., additional, Smith, Sharon L., additional, Stafford, K. M., additional, Steer, A., additional, Streletskiy, Dimitri A., additional, Svendby, Tove, additional, Tedesco, Marco, additional, Thomson, L., additional, Thorsteinsson, T., additional, Tian-Kunze, X., additional, Timmermans, Mary-Louise, additional, Tømmervik, Hans, additional, Tschudi, Mark, additional, Tucker, C. J., additional, Walker, Donald A., additional, Walsh, John E., additional, Wang, Muyin, additional, Webster, Melinda, additional, Wehrlé, A., additional, Winton, Øyvind, additional, Wolken, G., additional, Wood, K., additional, Wouters, B., additional, and Yang, D., additional
Published: 2022
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42. Wind Transport of Snow Impacts Ka- and Ku-band Radar Signatures on Arctic Sea Ice

Author: Nandan, Vishnu, primary, Willatt, Rosemary, additional, Mallett, Robbie, additional, Stroeve, Julienne, additional, Geldsetzer, Torsten, additional, Scharien, Randall, additional, Tonboe, Rasmus, additional, Landy, Jack, additional, Clemens-Sewall, David, additional, Jutila, Arttu, additional, Wagner, David N., additional, Krampe, Daniela, additional, Huntemann, Marcus, additional, Yackel, John, additional, Mahmud, Mallik, additional, Jensen, David, additional, Newman, Thomas, additional, Hendricks, Stefan, additional, Spreen, Gunnar, additional, Macfarlane, Amy, additional, Schneebeli, Martin, additional, Mead, James, additional, Ricker, Robert, additional, Gallagher, Michael, additional, Duguay, Claude, additional, Raphael, Ian, additional, Polashenski, Chris, additional, Tsamados, Michel, additional, Matero, Ilkka, additional, and Hoppman, Mario, additional
Published: 2022
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43. Snowfall and snow accumulation during the MOSAiC winter and spring seasons

Author: Wagner, David N., primary, Shupe, Matthew D., additional, Cox, Christopher, additional, Persson, Ola G., additional, Uttal, Taneil, additional, Frey, Markus M., additional, Kirchgaessner, Amélie, additional, Schneebeli, Martin, additional, Jaggi, Matthias, additional, Macfarlane, Amy R., additional, Itkin, Polona, additional, Arndt, Stefanie, additional, Hendricks, Stefan, additional, Krampe, Daniela, additional, Nicolaus, Marcel, additional, Ricker, Robert, additional, Regnery, Julia, additional, Kolabutin, Nikolai, additional, Shimanshuck, Egor, additional, Oggier, Marc, additional, Raphael, Ian, additional, Stroeve, Julienne, additional, and Lehning, Michael, additional
Published: 2022
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44. A New Structure for the Sea Ice Essential Climate Variables of the Global Climate Observing System

Author: Lavergne, Thomas, primary, Kern, Stefan, additional, Aaboe, Signe, additional, Derby, Lauren, additional, Dybkjaer, Gorm, additional, Garric, Gilles, additional, Heil, Petra, additional, Hendricks, Stefan, additional, Holfort, Jürgen, additional, Howell, Stephen, additional, Key, Jeffrey, additional, Lieser, Jan L, additional, Maksym, Ted, additional, Maslowski, Wieslaw, additional, Meier, Walt, additional, Muñoz-Sabater, Joaquín, additional, Nicolas, Julien, additional, Özsoy, Burcu, additional, Rabe, Benjamin, additional, Rack, Wolfgang, additional, Raphael, Marilyn, additional, de Rosnay, Patricia, additional, Smolyanitsky, Vasily, additional, Tietsche, Steffen, additional, Ukita, Jinro, additional, Vichi, Marcello, additional, Wagner, Penelope, additional, Willmes, Sascha, additional, and Zhao, Xi, additional
Published: 2022
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45. Export of Algal Biomass from the Melting Arctic Sea Ice

Author: Boetius, Antje, Albrecht, Sebastian, Bakker, Karel, Bienhold, Christina, Felden, Janine, Fernández-Méndez, Mar, Hendricks, Stefan, Katlein, Christian, Lalande, Catherine, Krumpen, Thomas, Nicolaus, Marcel, Peeken, Ilka, Rabe, Benjamin, Rogacheva, Antonina, Rybakova, Elena, Somavilla, Raquel, and Wenzhöfer, Frank
Published: 2013
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46. SMOS sea ice thickness - a review and way forward

Author: Kaleschke, Lars, Tian-Kunze, Xiangshan, Hendricks, Stefan, Ricker, Robert, and Raffaele, Crapolicchio
Subjects: Astrophysics::Earth and Planetary Astrophysics, Physics::Atmospheric and Oceanic Physics, Physics::Geophysics
Abstract: The sea ice on the oceans in the Arctic and Antarctic is a relatively thin blanket that significantly influences the exchange between the ocean and the atmosphere. The sea ice thickness is a major parameter, which is of great importance for diagnosis and prediction. Determining seasonal and interannual variations in sea ice thickness was the primary objective of ESA's CryoSat Earth Explorer mission. ESA's second Earth Explorer mission, SMOS, provides L-band brightness temperature data that can also be used to infer the thickness of the sea ice, although that was not its primary objective. Both missions complement each other strongly in terms of spatiotemporal sampling and their sensitivity to different ice thickness regimes. In order to further improve the synergistic use of low-frequency radiometric data for sea ice applications, it is imperative to better characterize the uncertainties and covariances associated with the retrieval. A key factor is a thorough understanding of the physical processes that determine the emissivity of sea ice in order to improve the forward model used for retrieval. A thermodynamic model is used to estimate the vertical temperature profile through the snow and sea ice. Therefore, additional meteorological data such as from atmospheric reanalyses and parameterizations of snow and sea ice properties must be taken into account. Natural sea ice is not a homogeneous medium of uniform sea ice and snow thickness, but can only be described by statistical distribution functions on different spatial scales. Thin ice and open water in leads within the compact pack ice also have a significant influence on the brightness temperature measured by SMOS. In order to take all these effects into account, the forward model or the observation operator must be of the appropriate complexity. The inversion to determine the geophysical sea ice parameters can be optimized with a-priori information and parameterizations as well as with information from other satellite sensors. The presentation will focus on a review of the current retrieval method used to generate the AWI-ESA level 3 and level 4 Sea Ice Thickness products and the way forward to improve the emissivity model and to define a common basis metrics validation to assess algorithms evolution considering that in-situ validation data is only sparsely available.
Published: 2022

47. Same but different? Lead fractions derived from SAR along the MOSAiC drift track

Author: von Albedyll, Luisa, Murashkin, Dmitrii, Willmes, Sascha, Hutter, Nils, Thielke, Linda, Hendricks, Stefan, Kaleschke, Lars, Tian-Kunze, Xiangshan, Spreen, Gunnar, and Haas, Christian
Subjects: lead fraction, drift, sea ice, SAR, MOSAiC
Published: 2022

48. High resolution helicopter-borne surface temperatures for satellite validation

Author: Thielke, Linda, Huntemann, Marcus, Spreen, Gunnar, Hendricks, Stefan, Jutila, Arttu, Murashkin, Dmitrii, and Ricker, Robert
Subjects: satellite validation, Sea Ice, helicopter-borne, High Resolution, surface temperature, MOSAiC
Published: 2022

49. High Resolution Ice Type Retrieval from X-Band SAR and Fused ALS Measurements from the MOSAiC Expedition

Author: Kortum, Karl, Singha, Suman, Spreen, Gunnar, Hendricks, Stefan, and Hutter, Nils
Subjects: classification, high resolution, Sea Ice, X-Band, Ice type, ALS, Oceanography, SAR, MOSAiC
Published: 2022

50. Long-term Observational Sea Ice Thickness Products from SMOS and CryoSat-2

Author: Tian-Kunze, Xiangshan, Kaleschke, Lars, Hendricks, Stefan, Ricker, Robert, and De la Fuente, Antonio
Published: 2022

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