Search

Your search keyword '"Hase, Frank"' showing total 987 results
Start Over Author "Hase, Frank"
987 results on '"Hase, Frank"'

201. XCO2 retrieval for GOSAT and GOSAT-2 based on the FOCAL algorithm

Author

Noël, Stefan, primary, Reuter, Maximilian, additional, Buchwitz, Michael, additional, Borchardt, Jakob, additional, Hilker, Michael, additional, Bovensmann, Heinrich, additional, Burrows, John P., additional, Di Noia, Antonio, additional, Suto, Hiroshi, additional, Yoshida, Yukio, additional, Buschmann, Matthias, additional, Deutscher, Nicholas M., additional, Feist, Dietrich G., additional, Griffith, David W. T., additional, Hase, Frank, additional, Kivi, Rigel, additional, Morino, Isamu, additional, Notholt, Justus, additional, Ohyama, Hirofumi, additional, Petri, Christof, additional, Podolske, James R., additional, Pollard, David F., additional, Sha, Mahesh Kumar, additional, Shiomi, Kei, additional, Sussmann, Ralf, additional, Té, Yao, additional, Velazco, Voltaire A., additional, and Warneke, Thorsten, additional

Published
2020
Full Text
View/download PDF

202. A decade of GOSAT Proxy satellite CH<sub>4</sub> observations

Author

Parker, Robert J., primary, Webb, Alex, additional, Boesch, Hartmut, additional, Somkuti, Peter, additional, Barrio Guillo, Rocio, additional, Di Noia, Antonio, additional, Kalaitzi, Nikoleta, additional, Anand, Jasdeep S., additional, Bergamaschi, Peter, additional, Chevallier, Frederic, additional, Palmer, Paul I., additional, Feng, Liang, additional, Deutscher, Nicholas M., additional, Feist, Dietrich G., additional, Griffith, David W. T., additional, Hase, Frank, additional, Kivi, Rigel, additional, Morino, Isamu, additional, Notholt, Justus, additional, Oh, Young-Suk, additional, Ohyama, Hirofumi, additional, Petri, Christof, additional, Pollard, David F., additional, Roehl, Coleen, additional, Sha, Mahesh K., additional, Shiomi, Kei, additional, Strong, Kimberly, additional, Sussmann, Ralf, additional, Té, Yao, additional, Velazco, Voltaire A., additional, Warneke, Thorsten, additional, Wennberg, Paul O., additional, and Wunch, Debra, additional

Published
2020
Full Text
View/download PDF

203. Diurnal evolution of total column and surface atmospheric ammonia in the megacity of Paris, France, during an intense springtime pollution episode

Author

Kutzner, Rebecca D., primary, Cuesta, Juan, additional, Chelin, Pascale, additional, Petit, Jean-Eudes, additional, Ray, Mokhtar, additional, Landsheere, Xavier, additional, Tournadre, Benoît, additional, Dupont, Jean-Charles, additional, Rosso, Amandine, additional, Hase, Frank, additional, Orphal, Johannes, additional, and Beekmann, Matthias, additional

Published
2020
Full Text
View/download PDF

204. Supplementary material to "Diurnal evolution of total column and surface atmospheric ammonia in the megacity of Paris, France, during an intense springtime pollution episode"

Author

Kutzner, Rebecca D., primary, Cuesta, Juan, additional, Chelin, Pascale, additional, Petit, Jean-Eudes, additional, Ray, Mokhtar, additional, Landsheere, Xavier, additional, Tournadre, Benoît, additional, Dupont, Jean-Charles, additional, Rosso, Amandine, additional, Hase, Frank, additional, Orphal, Johannes, additional, and Beekmann, Matthias, additional

Published
2020
Full Text
View/download PDF

205. Comparison of OCO-2 target observations to MUCCnet - Is it possible to capture urban XCO2 gradients from space?

Author

Rißmann, Maximilian, Jia Chen, Osterman, Gregory, Dietrich, Florian, Makowski, Moritz, Xinxu Zhao, Hase, Frank, and Kiel, Matthäus

Subjects
SPACE, REMOTE sensing, RURAL-urban differences, MOLE fraction, CARBON emissions, CITIES & towns, COSMIC abundances
Abstract

In this paper, we compare Orbiting Carbon Observatory 2 (OCO-2)'s measurements of column-averaged dry air mole fractions of CO2 (XCO2) and its urban-rural differences against ground-based remote sensing data measured by the Munich Urban Carbon Column network (MUCCnet). Since April 2020, OCO-2 regularly conducts target observations in Munich, Germany. Its target mode data provides high resolution XCO2 within a 15 km×20 km target field-of-view, that is greatly suited for carbon emission studies from space in cities and agglomerated areas. OCO-2 detects urban XCO2 with a RMSD of less than 1 ppm when compared to the MUCCnet reference site. OCO-2 target XCO2 is biased high against the ground-based measurements. The close proximity of MUCCnet's five fully automated remote sensing sites enables us to compare space-borne and ground-based XCO2 in three urban areas of Munich separately (centre, north, and west), by dividing the target field into three smaller comparison domains. Due to this more constraint collocation, we observe improved agreement between space-borne10and ground-based XCO2 in all three comparison domains. For the first time, XCO2 gradients within one OCO-2 target field-of-view are evaluated against ground-based measurements. We compare XCO2 gradients in the OCO-2 target observations to gradients captured by collocated MUCCnet sites. Generally, OCO-2 detects elevated XCO2 in the same regions as the ground-based monitoring network. More than 90 % of the observed space-borne gradients have the same orientation as the XCO2 gradients measured by MUCCnet. During our study, urban-rural enhancements are found to be in the range of 0.1 to 1 ppm. The low urban-rural gradients of typically well below 1 ppm in Munich during our study allow us to test OCO-2's lower detection limits for intra-urban XCO2 gradients. Urban XCO2 gradients recorded by the OCO-2 instruments and MUCCnet are strongly correlated (R2 = 0.6752) with each other and have an RMSD of 0.32 ppm. A case study, which includes a comparison of one OCO-2 target overpass to WRF-GHG modeled XCO2, reveals a similar distribution of enhanced CO2 column abundances in Munich. In this study, we address OCO-2's capability of detecting small-scale spatial XCO2 differences within one target observation. Our results suggest OCO-2's potential of assessing anthropogenic emissions from space. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

206. Retrieval of greenhouse gases from GOSAT and greenhouse gases and carbon monoxide from GOSAT-2 using the FOCAL algorithm.

Author

Noë, Stefan, Reuter, Maximilian, Buchwitz, Michael, Borchardt, Jakob, Hilker, Michael, Schneising, Oliver, Bovensmann, Heinrich, Burrows, John P., Di Noia, Antonio, Parker, Robert J., Hiroshi Suto, Yukio Yoshida, Buschmann, Matthias, Deutscher, Nicholas M., Feist, Dietrich G., Griffith, David W. T., Hase, Frank, Kivi, Rigel, Cheng Liu, and Morino, Isamu

Subjects
GREENHOUSE gases, CARBON monoxide, TRACE gases, WATER vapor, CARBON dioxide, NITROUS oxide, LATITUDE
Abstract

Recently, the Fast atmOspheric traCe gAs retrievaL (FOCAL) algorithm has been applied to measurements of the Greenhouse gases Observing SATellite (GOSAT) and its successor GOSAT-2. FOCAL has been originally developed for Orbiting Carbon Observatory-2 (OCO-2) retrievals with the focus on the derivation of carbon dioxide (XCO2). However, depending on the available spectral windows, FOCAL also successfully retrieves total column amounts for other atmospheric species. Here, we show new results from updated GOSAT and GOSAT-2 FOCAL retrievals. The main focus is placed on methane (XCH4; full physics and proxy product), water vapour (XH2O) and the relative ratio of semi-heavy water (HDO) to water vapour (δD). Due to the extended spectral range of GOSAT-2 it is also possible to derive information on carbon monoxide (XCO) and nitrous oxide (XN2O) for which we also show first results. We also present an update on XCO2 from both instruments. Compared to the previous product version (v1), the number of valid XCO2 data could be significantly increased in the updated version (v3.0) by 50% for GOSAT and about a factor of two for GOSAT-2. All FOCAL data products show reasonable spatial distribution and temporal variations. Comparisons with TCCON (Total Carbon Column Observing Network) result in station-to-station biases which are generally in line with the reported TCCON uncertainties. With this updated version of the GOSAT-2 FOCAL data, we provide a first total column average XN2O product. Global XN2O maps show a gradient from the tropics to higher latitudes in the order of 15 ppb, which can be explained by variations in tropopause height. The new GOSAT-2 XN2O product compares well with TCCON. Its station-to-station variability is lower than 2 ppb, which is about the magnitude of the typical N2O variations close to the surface. However, both GOSAT-2 and TCCON measurements show that the seasonal variations in the total column average XN2O are in the order of 8 ppb peak-topeak, which can be easily resolved by the GOSAT-2 FOCAL data. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

208. The Adaptable 4A Inversion (5AI): Description and first XCO2 retrievals from OCO-2 observations

Author

Dogniaux, Matthieu, primary, Crevoisier, Cyril, additional, Armante, Raymond, additional, Capelle, Virginie, additional, Delahaye, Thibault, additional, Cassé, Vincent, additional, De Mazière, Martine, additional, Deutscher, Nicholas M., additional, Feist, Dietrich G., additional, Garcia, Omaira E., additional, Griffith, David W. T., additional, Hase, Frank, additional, Iraci, Laura T., additional, Kivi, Rigel, additional, Morino, Isamu, additional, Notholt, Justus, additional, Pollard, David F., additional, Roehl, Coleen M., additional, Shiomi, Kei, additional, Strong, Kimberly, additional, Té, Yao, additional, Velazco, Voltaire A., additional, and Warneke, Thorsten, additional

Published
2020
Full Text
View/download PDF

209. Detection and attribution of wildfire pollution in the Arctic and northern midlatitudes using a network of Fourier-transform infrared spectrometers and GEOS-Chem

Author

Lutsch, Erik, primary, Strong, Kimberly, additional, Jones, Dylan B. A., additional, Blumenstock, Thomas, additional, Conway, Stephanie, additional, Fisher, Jenny A., additional, Hannigan, James W., additional, Hase, Frank, additional, Kasai, Yasuko, additional, Mahieu, Emmanuel, additional, Makarova, Maria, additional, Morino, Isamu, additional, Nagahama, Tomoo, additional, Notholt, Justus, additional, Ortega, Ivan, additional, Palm, Mathias, additional, Poberovskii, Anatoly V., additional, Sussmann, Ralf, additional, and Warneke, Thorsten, additional

Published
2020
Full Text
View/download PDF

210. Validation of Carbon Trace Gas Profile Retrievals from the NOAA-Unique Combined Atmospheric Processing System for the Cross-Track Infrared Sounder

Author

Nalli, Nicholas R., primary, Tan, Changyi, additional, Warner, Juying, additional, Divakarla, Murty, additional, Gambacorta, Antonia, additional, Wilson, Michael, additional, Zhu, Tong, additional, Wang, Tianyuan, additional, Wei, Zigang, additional, Pryor, Ken, additional, Kalluri, Satya, additional, Zhou, Lihang, additional, Sweeney, Colm, additional, Baier, Bianca C., additional, McKain, Kathryn, additional, Wunch, Debra, additional, Deutscher, Nicholas M., additional, Hase, Frank, additional, Iraci, Laura T., additional, Kivi, Rigel, additional, Morino, Isamu, additional, Notholt, Justus, additional, Ohyama, Hirofumi, additional, Pollard, David F., additional, Té, Yao, additional, Velazco, Voltaire A., additional, Warneke, Thorsten, additional, Sussmann, Ralf, additional, and Rettinger, Markus, additional

Published
2020
Full Text
View/download PDF

211. Intercomparison of Arctic ground-based XH2O observations from COCCON, TCCON and NDACC, and application of COCCON XH2O for IASI and TROPOMI validation

Author

Tu, Qiansi, primary, Hase, Frank, additional, Blumenstock, Thomas, additional, Schneider, Matthias, additional, Schneider, Andreas, additional, Kivi, Rigel, additional, Heikkinen, Pauli, additional, Ertl, Benjamin, additional, Diekmann, Christopher, additional, Khosrawi, Farahnaz, additional, Sommer, Michael, additional, Borsdorff, Tobias, additional, and Raffalski, Uwe, additional

Published
2020
Full Text
View/download PDF

212. Quality controls, bias, and seasonality of CO<sub>2</sub> columns in the boreal forest with Orbiting Carbon Observatory-2, Total Carbon Column Observing Network, and EM27/SUN measurements

Author

Jacobs, Nicole, primary, Simpson, William R., additional, Wunch, Debra, additional, O'Dell, Christopher W., additional, Osterman, Gregory B., additional, Hase, Frank, additional, Blumenstock, Thomas, additional, Tu, Qiansi, additional, Frey, Matthias, additional, Dubey, Manvendra K., additional, Parker, Harrison A., additional, Kivi, Rigel, additional, and Heikkinen, Pauli, additional

Published
2020
Full Text
View/download PDF

213. Bias Correction of the Ratio of Total Column CH4 to CO2 Retrieved from GOSAT Spectra

Author

Oshio, Haruki, primary, Yoshida, Yukio, additional, Matsunaga, Tsuneo, additional, Deutscher, Nicholas M., additional, Dubey, Manvendra, additional, Griffith, David W. T., additional, Hase, Frank, additional, Iraci, Laura T., additional, Kivi, Rigel, additional, Liu, Cheng, additional, Morino, Isamu, additional, Notholt, Justus, additional, Oh, Young-Suk, additional, Ohyama, Hirofumi, additional, Petri, Christof, additional, Pollard, David F., additional, Roehl, Coleen, additional, Shiomi, Kei, additional, Sussmann, Ralf, additional, Té, Yao, additional, Velazco, Voltaire A., additional, Warneke, Thorsten, additional, and Wunch, Debra, additional

Published
2020
Full Text
View/download PDF

215. Characterisation and potential for reducing optical resonances in FTIR spectrometers of the Network for the Detection of Atmospheric Composition Change (NDACC)

Author

Blumenstock, Thomas, primary, Hase, Frank, additional, Keens, Axel, additional, Czurlok, Denis, additional, Colebatch, Orfeo, additional, Garcia, Omaira, additional, Griffith, David W. T., additional, Grutter, Michel, additional, Hannigan, James W., additional, Heikkinen, Pauli, additional, Jeseck, Pascal, additional, Jones, Nicholas, additional, Kivi, Rigel, additional, Lutsch, Erik, additional, Makarova, Maria, additional, Imhasin, Hamud Kh., additional, Mellqvist, Johan, additional, Morino, Isamu, additional, Nagahama, Tomoo, additional, Notholt, Justus, additional, Ortega, Ivan, additional, Palm, Mathias, additional, Raffalski, Uwe, additional, Rettinger, Markus, additional, Robinson, John, additional, Schneider, Matthias, additional, Servais, Christian, additional, Smale, Dan, additional, Stremme, Wolfgang, additional, Strong, Kimberly, additional, Sussmann, Ralf, additional, Té, Yao, additional, and Velazco, Voltaire A., additional

Published
2020
Full Text
View/download PDF

216. Formaldehyde total column densities over Mexico City: comparison between MAX-DOAS and solar absorption FTIR measurements

Author

Rivera Cárdenas, Claudia, primary, Guarín, Cesar, additional, Stremme, Wolfgang, additional, Friedrich, Martina M., additional, Bezanilla, Alejandro, additional, Rivera Ramos, Diana, additional, Mendoza-Rodríguez, Cristina A., additional, Grutter, Michel, additional, Blumenstock, Thomas, additional, and Hase, Frank, additional

Published
2020
Full Text
View/download PDF

217. Characterizing model errors in chemical transport modeling of methane: impact of model resolution in versions v9-02 of GEOS-Chem and v35j of its adjoint model

Author

Stanevich, Ilya, primary, Jones, Dylan B. A., additional, Strong, Kimberly, additional, Parker, Robert J., additional, Boesch, Hartmut, additional, Wunch, Debra, additional, Notholt, Justus, additional, Petri, Christof, additional, Warneke, Thorsten, additional, Sussmann, Ralf, additional, Schneider, Matthias, additional, Hase, Frank, additional, Kivi, Rigel, additional, Deutscher, Nicholas M., additional, Velazco, Voltaire A., additional, Walker, Kaley A., additional, and Deng, Feng, additional

Published
2020
Full Text
View/download PDF

218. Observed Hemispheric Asymmetry in Stratospheric Transport Trends From 1994 to 2018

Author

Strahan, Susan E., primary, Smale, Dan, additional, Douglass, Anne R., additional, Blumenstock, Thomas, additional, Hannigan, James W., additional, Hase, Frank, additional, Jones, Nicholas B., additional, Mahieu, Emmanuel, additional, Notholt, Justus, additional, Oman, Luke D., additional, Ortega, Ivan, additional, Palm, Mathias, additional, Prignon, Maxime, additional, Robinson, John, additional, Schneider, Matthias, additional, Sussmann, Ralf, additional, and Velazco, Voltaire A., additional

Published
2020
Full Text
View/download PDF

219. Ship-borne measurements of XCO<sub>2</sub>, XCH<sub>4</sub>, and XCO above the Pacific Ocean and comparison to CAMS atmospheric analyses and S5P/TROPOMI

Author

Knapp, Marvin, primary, Kleinschek, Ralph, additional, Hase, Frank, additional, Agustí-Panareda, Anna, additional, Inness, Antje, additional, Barré, Jérôme, additional, Landgraf, Jochen, additional, Borsdorff, Tobias, additional, Kinne, Stefan, additional, and Butz, André, additional

Published
2020
Full Text
View/download PDF

220. Methane retrieved from TROPOMI: improvement of the data product and validation of the first two years of measurements

Author

Lorente, Alba, primary, Borsdorff, Tobias, additional, Butz, Andre, additional, Hasekamp, Otto, additional, aan de Brugh, Joost, additional, Schneider, Andreas, additional, Hase, Frank, additional, Kivi, Rigel, additional, Wunch, Debra, additional, Pollard, David F., additional, Shiomi, Kei, additional, Deutscher, Nicholas M., additional, Velazco, Voltaire A., additional, Roehl, Coleen M., additional, Wennberg, Paul O., additional, Warneke, Thorsten, additional, and Landgraf, Jochen, additional

Published
2020
Full Text
View/download PDF

223. Toward High Precision XCO2 Retrievals from TanSat Observations: Retrieval Improvement and Validation against TCCON Measurements

Author

Yang, Dongxu, primary, Boesch, Hartmut, additional, Liu, Yi, additional, Somkuti, Peter, additional, Cai, Zhaonan, additional, Chen, Xi, additional, Di Noia, Antonio, additional, Lin, Chao, additional, Lu, Naimen, additional, Lyu, Daren, additional, Parker, Robert, additional, Tian, Longfei, additional, Wang, Maohua, additional, Webb, Alex J., additional, Yao, Lu, additional, Yin, Zengshan, additional, Zheng, Yuquan, additional, Deutscher, Nicholas Michael, additional, Griffith, David W.T, additional, Hase, Frank, additional, Kivi, Rigel, additional, Morino, Isamu, additional, Notholt, Justus, additional, Ohyama, Hirofumi, additional, Pollard, David Frank, additional, Sussmann, Ralf, additional, Shiomi, Kei, additional, Té, Yao, additional, Velazco, Voltaire Almario, additional, Warneke, Thorsten, additional, and Wunch, Debra, additional

Published
2020
Full Text
View/download PDF

224. Emission Monitoring Mobile Experiment (EMME): an overview and first results of the St. Petersburg megacity campaign-2019

Author

Makarova, Maria V., primary, Alberti, Carlos, additional, Ionov, Dmitry V., additional, Hase, Frank, additional, Foka, Stefani C., additional, Blumenstock, Thomas, additional, Warneke, Thorsten, additional, Virolainen, Yana A., additional, Kostsov, Vladimir S., additional, Frey, Matthias, additional, Poberovskii, Anatoly V., additional, Timofeyev, Yuri M., additional, Paramonova, Nina N., additional, Volkova, Kristina A., additional, Zaitsev, Nikita A., additional, Biryukov, Egor Y., additional, Osipov, Sergey I., additional, Makarov, Boris K., additional, Polyakov, Alexander V., additional, Ivakhov, Viktor M., additional, Imhasin, Hamud Kh., additional, and Mikhailov, Eugene F., additional

Published
2020
Full Text
View/download PDF

226. Supplementary material to "Quality controls, bias, and seasonality of CO2 columns in the Boreal Forest with OCO-2, TCCON, and EM27/SUN measurements"

Author

Jacobs, Nicole, primary, Simpson, William R., additional, Wunch, Debra, additional, O'Dell, Christopher W., additional, Osterman, Gregory B., additional, Hase, Frank, additional, Blumenstock, Thomas, additional, Tu, Qiansi, additional, Frey, Matthias, additional, Dubey, Manvendra K., additional, Parker, Harrison A., additional, Kivi, Rigel, additional, and Heikkinen, Pauli, additional

Published
2020
Full Text
View/download PDF

227. Quality controls, bias, and seasonality of CO2 columns in the Boreal Forest with OCO-2, TCCON, and EM27/SUN measurements

Author

Jacobs, Nicole, primary, Simpson, William R., additional, Wunch, Debra, additional, O'Dell, Christopher W., additional, Osterman, Gregory B., additional, Hase, Frank, additional, Blumenstock, Thomas, additional, Tu, Qiansi, additional, Frey, Matthias, additional, Dubey, Manvendra K., additional, Parker, Harrison A., additional, Kivi, Rigel, additional, and Heikkinen, Pauli, additional

Published
2020
Full Text
View/download PDF

235. Long-term column-averaged greenhouse gas observations using a COCCON spectrometer at a high surface albedo site in Namibia

Author

Frey, Matthias, primary, Blumenstock, Thomas, additional, Dubravica, Darko, additional, Hase, Frank, additional, Goettsche, Frank, additional, Gross, Jochen, additional, Olesen, Folke, additional, Amadhila, Petrus, additional, Handjaba, Martin, additional, Maggs-Koelling, Gillian, additional, Marais, Eugene, additional, Mushi, Roland, additional, Morino, Isamu, additional, Shiomi, Kei, additional, de Maziere, Martine, additional, and Sha, Mahesh Kumar, additional

Published
2020
Full Text
View/download PDF

236. The Sentinel-5 Precursor VAlidatioN and calibraTion Experiment (SVANTE)

Author

Van Roozendael, Michel, primary, Tack, Frederik, additional, Merlaud, Alexis, additional, Schuettemeyer, Dirk, additional, Hase, Frank, additional, Richter, Andreas, additional, Meier, Andreas, additional, Sha, Mahesh Kumar, additional, De Mazière, Martine, additional, Apituley, Arnoud, additional, Nicolae, Doina, additional, Calcan, Andreaa, additional, Ruhtz, Thomas, additional, Crévoisier, Cyril, additional, Roiger, Anke, additional, Dehn, Angelika, additional, and Zehner, Claus, additional

Published
2020
Full Text
View/download PDF

240. Ensemble-based satellite-derived carbon dioxide and methane column-averaged dry-air mole fraction data sets (2003–2018) for carbon and climate applications

Author

Reuter, Maximilian, primary, Buchwitz, Michael, additional, Schneising, Oliver, additional, Noël, Stefan, additional, Bovensmann, Heinrich, additional, Burrows, John P., additional, Boesch, Hartmut, additional, Di Noia, Antonio, additional, Anand, Jasdeep, additional, Parker, Robert J., additional, Somkuti, Peter, additional, Wu, Lianghai, additional, Hasekamp, Otto P., additional, Aben, Ilse, additional, Kuze, Akihiko, additional, Suto, Hiroshi, additional, Shiomi, Kei, additional, Yoshida, Yukio, additional, Morino, Isamu, additional, Crisp, David, additional, O'Dell, Christopher W., additional, Notholt, Justus, additional, Petri, Christof, additional, Warneke, Thorsten, additional, Velazco, Voltaire A., additional, Deutscher, Nicholas M., additional, Griffith, David W. T., additional, Kivi, Rigel, additional, Pollard, David F., additional, Hase, Frank, additional, Sussmann, Ralf, additional, Té, Yao V., additional, Strong, Kimberly, additional, Roche, Sébastien, additional, Sha, Mahesh K., additional, De Mazière, Martine, additional, Feist, Dietrich G., additional, Iraci, Laura T., additional, Roehl, Coleen M., additional, Retscher, Christian, additional, and Schepers, Dinand, additional

Published
2020
Full Text
View/download PDF

241. Spectral sizing of a coarse-spectral-resolution satellite sensor for XCO<sub>2</sub>

Author

Wilzewski, Jonas Simon, primary, Roiger, Anke, additional, Strandgren, Johan, additional, Landgraf, Jochen, additional, Feist, Dietrich G., additional, Velazco, Voltaire A., additional, Deutscher, Nicholas M., additional, Morino, Isamu, additional, Ohyama, Hirofumi, additional, Té, Yao, additional, Kivi, Rigel, additional, Warneke, Thorsten, additional, Notholt, Justus, additional, Dubey, Manvendra, additional, Sussmann, Ralf, additional, Rettinger, Markus, additional, Hase, Frank, additional, Shiomi, Kei, additional, and Butz, André, additional

Published
2020
Full Text
View/download PDF

242. Atmospheric CO2 and CH4 abundances on regional scales in boreal areas using CAMS reanalysis, COCCON spectrometers and Sentinel-5 Precursor satellite observations

Author

Tu, Qiansi, primary, Hase, Frank, additional, Blumenstock, Thomas, additional, Kivi, Rigel, additional, Heikkinen, Pauli, additional, Sha, Mahesh Kumar, additional, Raffalski, Uwe, additional, Landgraf, Jochen, additional, Lorente, Alba, additional, Borsdorff, Tobias, additional, and Chen, Huilin, additional

Published
2020
Full Text
View/download PDF

244. A scientific algorithm to simultaneously retrieve carbon monoxide and methane from TROPOMI onboard Sentinel-5 Precursor

Author

Schneising, Oliver, primary, Buchwitz, Michael, additional, Reuter, Maximilian, additional, Bovensmann, Heinrich, additional, Burrows, John P., additional, Borsdorff, Tobias, additional, Deutscher, Nicholas M., additional, Feist, Dietrich G., additional, Griffith, David W. T., additional, Hase, Frank, additional, Hermans, Christian, additional, Iraci, Laura T., additional, Kivi, Rigel, additional, Landgraf, Jochen, additional, Morino, Isamu, additional, Notholt, Justus, additional, Petri, Christof, additional, Pollard, David F., additional, Roche, Sébastien, additional, Shiomi, Kei, additional, Strong, Kimberly, additional, Sussmann, Ralf, additional, Velazco, Voltaire A., additional, Warneke, Thorsten, additional, and Wunch, Debra, additional

Published
2019
Full Text
View/download PDF

245. Analysis of the instrumental line shape of high-resolution Fourier transform IR spectrometers with gas cell measurements and new retrieval software

Author

Hase, Frank, Blumenstock, Thomas, and Paton-Walsh, Clare

Subjects
Fourier transform infrared spectroscopy -- Equipment and supplies, Optical spectrometers -- Research, Gas lasers -- Research, Meteorological optics -- Research, Software -- Research, Astronomy, Physics
Abstract

The instrumental line shape (ILS) of two commercial high-resolution Fourier transform IR spectrometers has been analysed with gas cell measurements and a new ILS retrieval software LINEFIT. The instruments are used for atmospheric remote sounding, and the compatibility of the ILS deduced from laboratory gas cell measurements with the ILS in the atmospheric measurement itself is examined.

Published
1999

246. Atmospheric ray path modeling for radiative transfer algorithms

Author

Hase, Frank and Hopfner, Michael

Subjects
Meteorological optics -- Models, Radiative transfer -- Models, Infrared spectra -- Models, Astronomy, Physics
Abstract

A new method for the determination of ray paths as well as resulting path segments and partial gas columns within a layered atmosphere is presented. Any singularity at the tangent point is avoided. No use is made of the gross spherical symmetry of the Earth's atmosphere. Using this approach we examine the impact of the Earth's oblate shape and horizontal atmospheric inhomogeneities on infrared limb spectra.

Published
1999

247. Quantifying hard coal mines CH4 emissions from TROPOMI and IASI observations using high-resolution CAMS forecast data and the wind-assigned anomaly method.

Author

Qiansi Tu, Schneider, Matthias, Hase, Frank, Khosrawi, Farahnaz, Ertl, Benjamin, Necki, Jaroslaw, Dubravica, Darko, Diekmann, Christopher J., Blumenstock, Thomas, and Dianjun Fang

Abstract

Intensive coal mining activities are in the Upper Silesian Coal Basin (USCB) in southern Poland, resulting in large amounts of methane (CH4) emissions. Annual CH4 emission reached to 448 kt according to the European Pollutant Release and Transfer Register (E-PRTR, 2017). As a CH4 emission hot spot in Europe, it is of importance to investigate its emission sources and accurate emission estimates. In this study, we use satellite-based column-averaged dry-air molar fraction observations of CH4 (XCH4) from the TROPOspheric Monitoring Instrument (TROPOMI) and tropospheric XCH4 (TXCH4) from the Infrared Atmospheric Sounding Interferometer (IASI), together with the high-resolution model forecast XCH4 and TXCH4 from the Copernicus Atmosphere Monitoring Service (CAMS) to estimate the CH4 emission rate averaged over three years in the USCB region (49.3° - 50.8° N and 18° - 20° E). Using the CAMS inventory as the a priori knowledge of the sources, together with ERA5 wind at 330 m, the wind-assigned XCH4 anomalies for two opposite wind directions are calculated, which yields an estimated CH4 emission of 9.6E26 ± 1.4E25 molec./s for CAMS XCH4 and 9.1E26 ± 1.2E25 molec./s for CAMS TXCH4. These values are very close to the total emission of the CAMS inventory (9.7E26 molec./s). Very good agreements between CAMS and the wind-assigned model results (R²=0.89 for XCH4 and TXCH4) indicate that our wind-assigned method is quite robust. The similar estimates of XCH4 and TXCH4 also imply that for a strong source, the dynamically induced variations of the CH4 mixing ratio in the upper troposphere and lower stratosphere region is of secondary importance. This wind-assigned method is further applied to the TROPOMI XCH4 and TROPOMI+IASI TXCH4 with using the Carbon dioxide and Methane (CoMet) inventory performed in 2018. The calculated averaged total CH4 emission over the USCB region is about 5.7E26 ± 4.9E24 molec./s for TROPOMI XCH4 and 5.2E26 ± 2.2E25 molec./s for TROPOMI+IASI TXCH4. These results are very close and thus in agreement to the emissions given in the E-PRTR inventory (5.33E26 molec./s) and the CoMet inventory (6.6E26 molec./s). Since the wind speed is increasing with altitude, sensitivity tests show that higher CH4 emission strengths are yielded with increasing altitude and vice versa. About 23% lower and 13% higher estimates are obtained when using lower wind information at 10 m and higher wind information at 500 m instead of 330 m, respectively. When using different wind coverage and different wind segmentation, an uncertainty of 4.2% and -2.1% is obtained, respectively. These results suggest that our wind-assigned method is quite robust and might also serve as a simple method to estimate CH4 or CO2 emissions for other regions. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

248. Observational constraints on methane emissions from Polish coal mines using a ground-based remote sensing network.

Author

Luther, Andreas, Kostinek, Julian, Kleinschek, Ralph, Defratyka, Sara, Stanisavljevic, Mila, Forstmaier, Andreas, Dandocsi, Alexandra, Scheidweiler, Leon, Dubravica, Darko, Wildmann, Norman, Hase, Frank, Frey, Matthias M., Chen, Jia, Dietrich, Florian, Necki, Jaroslaw, Swolkien, Justyna, Knote, Christoph, Vardag, Sanam N., Roiger, Anke, and Butz, André

Abstract

Given its abundant coal mining activities, the Upper Silesian Coal Basin (USCB) in southern Poland is one of the largest sources for anthropogenic methane (CH4) emissions in Europe. Here, we report on CH4 emission estimates for coal mine ventilation facilities in the USCB. Our estimates are driven by pair-wise upwind-downwind observations of the column-average dry-air mole fractions of CH4 (XCH4) by a network of four portable, ground-based, sun-viewing Fourier Transform Spectrometers of the type EM27/SUN operated during the CoMet campaign in May/June 2018. The EM27/SUN were deployed in the four cardinal directions around the USCB in approx. 50 km distance to the center of the basin. We report on six case studies for which we inferred emissions by evaluating the mismatch between the observed downwind enhancements and simulations based on trajectory calculations releasing particles out of the ventilation shafts using the Lagrangian particle dispersion model FLEXPART. The latter was driven by wind fields calculated by WRF (Weather Research and Forecasting model) under assimilation of vertical wind profile measurements of three co-deployed wind lidars. For emission estimation, we use a Phillips-Tikhonov regularization scheme with the L-curve criterion. Diagnosed by the averaging kernels, we find that, depending on the catchment area of the downwind measurements, our ad-hoc network can resolve individual facilities or groups of ventilation facilities but that inspecting the averaging kernels is essential to detected correlated estimates. Generally, our instantaneous emission estimates range between 80 and 133kt CH4 a-1 for the south-eastern part of the USCB and between 414 and 790kt CH4 a-1 for various larger parts of the basin, suggesting higher emissions than expected from theannual emissions reported by the E-PRTR (European Pollutant Release and Transfer Register). Uncertainties range between 23 and 36% dominated by the error contribution from uncertain wind fields. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

249. Characterizing model errors in chemical transport modelling of methane: Using GOSAT XCH4 data with weak constraint four-dimensional variational data assimilation

Author

Stanevich, Ilya, Jones, Dylan B. A., Strong, Kimberly, Keller, Martin, Henze, Daven K., Parker, Robert J., Boesch, Hartmut, Wunch, Debra, Notholt, Justus, Petri, Christof, Warneke, Thorsten, Sussmann, Ralf, Schneider, Matthias, Hase, Frank, Kivi, Rigel, Deutscher, Nicholas M., Velazco, Voltaire A., Walker, Kaley A., and Deng, Feng

Abstract

We examined biases in the global GEOS-Chem chemical transport model for the period of February–May 2010 using weak constraint (WC) four-dimensional variational (4D-Var) data assimilation and dry-air mole fractions of CH4 (XCH4) from the Greenhouse gases Observing SATellite (GOSAT). The ability of the observations and the WC 4D-Var method to mitigate model errors in CH4 concentrations was first investigated in a set of observing system simulation experiments (OSSEs). We then assimilated the GOSAT XCH4 retrievals and found that they were capable of differentiating the vertical distribution of model errors and of removing a significant portion of biases in the modelled CH4 state. In the WC 4D-Var assimilation, corrections were added to the modeled CH4 state at each model time step to account for model errors and improve the model fit to the assimilated observations. Compared to the conventional strong constraint (SC) 4D-Var assimilation, the WC method was able to significantly improve the model fit to independent observations. Examination of the WC state corrections suggested that a significant source of the model errors was associated with discrepancies in the model CH4 in the stratosphere. The WC state corrections also suggested that the model vertical transport in the troposphere at mid- and high-latitudes is too weak. The problem was traced back to biases in the uplift of CH4 over the source regions in eastern China and North America. In the tropics, the WC assimilation pointed to the possibility of biased CH4 outflow from the African continent to the Atlantic in the mid-troposphere. The WC assimilation in this region would greatly benefit from glint observations over the ocean to provide additional constraints on the vertical structure of the model errors in the tropics. We also compared the WC assimilation at the 4° × 5° and 2° × 2.5° horizontal resolutions and found that the WC corrections to mitigate the model errors were significantly larger at 4° × 5° than at 2° × 2.5° resolution, indicating the presence of resolution-dependent model errors. Our results illustrate the potential utility of the WC 4D-Var approach for characterizing model errors. However, a major limitation of this approach is the need to better characterize the specified model error covariance in the assimilation scheme.

Published
2019

250. Intercomparison of low and high resolution infrared spectrometers for ground-based solar remote sensing measurements of total column concentrations of CO2, CH4 and CO

Author

Sha, Mahesh Kumar, Mazière, Martine, Notholt, Justus, Blumenstock, Thomas, Chen, Huilin, Dehn, Angelika, Griffith, David W T, Hase, Frank, Heikkinen, Pauli, Hermans, Christian, Hoffmann, Alex, Huebner, Marko, Jones, Nicholas, Kivi, Rigel, Langerock, Bavo, Petri, Christof, Scolas, Francis, Tu, Qiansi, and Weidmann, Damien

Abstract

The Total Carbon Column Observing Network (TCCON) has been the baseline network of instruments that record solar absorption spectra from which accurate and precise column-averaged dry air mole fractions of CO2 (XCO2), CH4 (XCH4), CO (XCO) and other gases are retrieved. The TCCON data have been widely used for carbon cycle science and validation of satellites measuring greenhouse gas concentrations globally. The number of stations in the network (currently about 25) is limited and the stations are distributed mostly in Northern America, Europe, Japan and Oceania leaving gaps in the global coverage. A denser distribution of ground-based solar absorption measurements is needed to cover various atmospheric conditions (humid, dry, polluted, presence of aerosol), various surface conditions (high and low albedo) and a larger latitudinal distribution. More stations in the southern hemisphere are also needed but a further expansion of the network is limited by its costs and logistical requirements. For this reason several groups are investigating supplemental portable low-cost instruments. The European Space Agency (ESA) funded campaign Fiducial Reference Measurements for Ground-Based Infrared Greenhouse Gas Observations (FRM4GHG) at the Sodankylä TCCON site in northern Finland aims at characterising the assessment of several low-cost portable instruments for precise solar absorption measurements of XCO2, XCH4 and XCO. The test instruments under investigation are three Fourier transform spectrometers (FTS): a Bruker EM27/SUN, a Bruker IRcube and a Bruker Vertex70; as well as a Laser Heterodyne spectro-Radiometer (LHR) developed by the UK Rutherford Appleton Laboratory. All four remote sensing instruments performed measurements simultaneously next to the reference TCCON instrument, a Bruker IFS 125HR, for a full year in 2017. The TCCON FTS was operated in its normal high-resolution mode (TCCON data set) and in a special low-resolution mode (HR125LR data set), similar to the portable spectrometers. The remote sensing measurements have been complemented by regular AirCore launches performed from the same site. They provide in-situ vertical profiles of the target gas concentrations as auxiliary reference data for the column retrievals which is traceable to the WMO SI standards. The timeseries, the bias relative to the reference instrument and its scatter and the seasonal and the day-to-day variations of the target gases are shown and discussed. The comparisons with the HR125LR data set gave useful analysis of the resolution dependent effects on the target gas retrieval. The solar zenith angle dependence of the retrievals is shown and discussed. The reference measurements performed with the Bruker IFS 125HR (TCCON and HR125LR data sets) were found to be affected by non-linearity. A non-linearity correction of the TCCON data was performed and compared with the test instruments and AirCore. The non-linearity corrected TCCON data show a better match with the test instruments and AirCore data as compared to the reference TCCON data. The intercomparison results show that the LHR data have a large scatter and biases with a strong diurnal variation relative to the TCCON and other FTS instruments. The LHR is a new instrument under development and these biases are being currently investigated and addressed. The campaign helped to characterise and identify the instrumental biases and possibly retrieval biases which are currently under investigation. Further improvements of the instrument are ongoing. The EM27/SUN, the IRcube, the modified Vertex70 and the HR125LR provided stable and precise measurements of the target gases during the campaign with quantified small biases. The bias dependence on the humidity along the measurement line-of-sight has been investigated and no dependence was found. These three portable low-resolution FTS instruments are suitable to be used for campaign deployment or long-term measurements from any site and offer the ability to complement the TCCON and expand the global coverage of ground-based reference measurements of the target gases.

Published
2019

Catalog

Books, media, physical & digital resources
See catalog results