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202 results on '"Roy-Barman, Matthieu"'

3. A global scavenging and circulation ocean model of thorium-230 and protactinium-231 with realistic particle dynamics (NEMO-ProThorP 0.1)

Author

van Hulten, Marco, Dutay, Jean-Claude, and Roy-Barman, Matthieu

Subjects
Physics - Atmospheric and Oceanic Physics, Computer Science - Computational Engineering, Finance, and Science
Abstract

In this paper, we set forth a 3-D ocean model of the radioactive trace isotopes Th-230 and Pa-231. The interest arises from the fact that these isotopes are extensively used for investigating particle transport in the ocean and reconstructing past ocean circulation. The tracers are reversibly scavenged by biogenic and lithogenic particles. Our simulations of Th-230 and Pa-231 are based on the NEMO-PISCES ocean biogeochemistry general circulation model, which includes biogenic particles, namely small and big particulate organic carbon, calcium carbonate and biogenic silica. Small and big lithogenic particles from dust deposition are included in our model as well. Their distributions generally compare well with the small and big lithogenic particle concentrations from recent observations from the GEOTRACES programme, except for boundary nepheloid layers for which, as up to today, there are no non-trivial, prognostic models available on a global scale. Our simulations reproduce Th-230 and Pa-231 dissolved concentrations: they compare well with recent GEOTRACES observations in many parts of the ocean. Particulate Th-230 and Pa-231 concentrations are significantly improved compared to previous studies, but they are still too low because of missing particles from nepheloid layers. Our simulation reproduces the main characteristics of the Pa-231/Th-230 ratio observed in the sediments, and supports a moderate affinity of Pa-231 to biogenic silica as suggested by recent observations, relative to Th-230. Future model development may further improve understanding, especially when this will include a more complete representation of all particles, including different size classes, manganese hydroxides and nepheloid layers. This can be done based on our model, as its source code is readily available., Comment: submitted to Geoscientific Model Development

Published
2017
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8. The large-scale evolution of neodymium isotopic composition in the global modern and Holocene ocean revealed from seawater and archive data

Author

Tachikawa, Kazuyo, Arsouze, Thomas, Bayon, Germain, Bory, Aloys, Colin, Christophe, Dutay, Jean-Claude, Frank, Norbert, Giraud, Xavier, Gourlan, Alexandra T., Jeandel, Catherine, Lacan, François, Meynadier, Laure, Montagna, Paolo, Piotrowski, Alexander M., Plancherel, Yves, Pucéat, Emmanuelle, Roy-Barman, Matthieu, and Waelbroeck, Claire

Published
2017
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9. 230Th Normalization: New Insights on an Essential Tool for Quantifying Sedimentary Fluxes in the Modern and Quaternary Ocean

Author

Costa, Kassandra M, Hayes, Christopher T, Hillaire‐Marcel, Claude, Hoffmann, Sharon, Jaccard, Samuel L, Jacobel, Allison W, Kienast, Stephanie S, Kipp, Lauren, Lerner, Paul, Lippold, Jörg, Lund, David, Marcantonio, Franco, Anderson, Robert F, McGee, David, McManus, Jerry F, Mekik, Figen, Middleton, Jennifer L, Missiaen, Lise, Not, Christelle, Pichat, Sylvain, Robinson, Laura F, Rowland, George H, Roy‐Barman, Matthieu, Pavia, Frank J, Tagliabue, Alessandro, Torfstein, Adi, Winckler, Gisela, Zhou, Yuxin, Bausch, Alexandra, Deng, Feifei, Dutay, Jean‐Claude, Geibert, Walter, Heinze, Christoph, and Henderson, Gideon

Subjects
Geosciences (General)
Published
2020
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15. Amélioration de l’information spatiale concernant des infrastructures hydrauliques historiques de la Ville de Paris

Author

Fernandez, Mathieu, Dumont, Emmanuel, Branchu, Philippe, Guillerme, André, Lestel, Laurence, Pons-Branchu, Edwige, Ramier, David, Roy-Barman, Matthieu, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Histoire des technosciences en société (HT2S), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement (Cerema), Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols (METIS), École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Géochimie Des Impacts (GEDI), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Union internationale de spéléologie, and ANR-18-CE22-0009,HUNIWERS,Impact historique de l'urbanisation sur la qualité de l'eau: étude diachronique en région parisienne(2018)

Subjects
[SHS]Humanities and Social Sciences
Abstract

International audience; A research project aims to contribute to a historical repository of the quality of surface water in dense urban areas for about two centuries. A section of the project is dedicated to formalizing the link between physico-chemical analyzes of calcareous concretions taken from urban cavities (aqueducts, quarries) and urban archives with the aim of reconstructing the conditions of formation of concretions: topographic, geological, hydrogeological, anthropic (various contaminations). To this end, a large variety of environmental archives are mobilized and processed using tools offered by the digital humanities (from GIS to web data visualization). This communication proposes to expose the methodologies implemented and the results obtained concerning the topographic reconstruction of the aqueduct of Belleville and Rungis on the basis of first-hand archives.; Un projet de recherches (Huniwers – ANR 18-CE22-0009) vise à contribuer à un référentiel historique concernant la qualité des eaux superficielles en milieu urbain dense depuis environ deux siècles. Une section du projet se consacre à formaliser le lien entre analyses physico-chimiques de concrétions calcaires prélevées dans des cavités urbaines (aqueducs, carrières) et archives urbaines dans le but de reconstituer les conditions de formations des concrétions : topographiques, géologiques, hydrogéologiques, anthropiques (contaminations diverses). Dans cet objectif, une importante variété d'archives environnementales est mobilisée et traitée à l'aide d'outils proposés par les humanités numériques (des SIG à la datavisualisation web). Cette communication propose d'exposer les méthodologies mises en œuvre et les résultats obtenus concernant la reconstitution topographique des aqueducs de Belleville et de Rungis sur la base d’archives de première main.

Published
2022

28. Tracer les plombs de Notre-Dame de Paris à l’aide de leurs signatures isotopique et élémentaire

Author

Briard, Justine, Ayrault, Sophie, Roy-Barman, Matthieu, Bordier, Louise, L'Héritier, Maxime, Azema, Aurélia, Syvilay, Delphine, Baron, Sandrine, Géochimie Des Impacts (GEDI), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université Paris 8 Vincennes-Saint-Denis (UP8), Archéologies et Sciences de l'Antiquité (ArScAn), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Institut national de recherches archéologiques préventives (Inrap)-Centre National de la Recherche Scientifique (CNRS), Archéologie de la Gaule : structures économiques et sociales (GAMA), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Institut national de recherches archéologiques préventives (Inrap)-Centre National de la Recherche Scientifique (CNRS)-Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Institut national de recherches archéologiques préventives (Inrap)-Centre National de la Recherche Scientifique (CNRS), Travaux et recherches archéologiques sur les cultures, les espaces et les sociétés (TRACES), École des hautes études en sciences sociales (EHESS)-Université Toulouse - Jean Jaurès (UT2J)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Fondation de la Maison de la Chimie, Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), École des hautes études en sciences sociales (EHESS)-Université Toulouse - Jean Jaurès (UT2J), and Université de Toulouse (UT)-Université de Toulouse (UT)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM]Chemical Sciences
Published
2022

29. 230 Th Normalization: New Insights on an Essential Tool for Quantifying Sedimentary Fluxes in the Modern and Quaternary Ocean

Author

Costa, Kassandra M., Hayes, Christopher T., Anderson, Robert F., Pavia, Frank J., Bausch, Alexandra, Deng, Feifei, Dutay, Jean‐Claude, Geibert, Walter, Heinze, Christoph, Henderson, Gideon, Hillaire‐Marcel, Claude, Hoffmann, Sharon, Jaccard, Samuel L., Jacobel, Allison W., Kienast, Stephanie S., Kipp, Lauren, Lerner, Paul, Lippold, Jörg, Lund, David, Marcantonio, Franco, McGee, David, McManus, Jerry F., Mekik, Figen, Middleton, Jennifer L., Missiaen, Lise, Not, Christelle, Pichat, Sylvain, Robinson, Laura F., Rowland, George H., Roy‐Barman, Matthieu, Tagliabue, Alessandro, Torfstein, Adi, Winckler, Gisela, Zhou, Yuxin, Costa, Kassandra M., Hayes, Christopher T., Anderson, Robert F., Pavia, Frank J., Bausch, Alexandra, Deng, Feifei, Dutay, Jean‐Claude, Geibert, Walter, Heinze, Christoph, Henderson, Gideon, Hillaire‐Marcel, Claude, Hoffmann, Sharon, Jaccard, Samuel L., Jacobel, Allison W., Kienast, Stephanie S., Kipp, Lauren, Lerner, Paul, Lippold, Jörg, Lund, David, Marcantonio, Franco, McGee, David, McManus, Jerry F., Mekik, Figen, Middleton, Jennifer L., Missiaen, Lise, Not, Christelle, Pichat, Sylvain, Robinson, Laura F., Rowland, George H., Roy‐Barman, Matthieu, Tagliabue, Alessandro, Torfstein, Adi, Winckler, Gisela, and Zhou, Yuxin

Abstract

© 2020. The Authors. 230Th normalization is a valuable paleoceanographic tool for reconstructing high-resolution sediment fluxes during the late Pleistocene (last ~500,000 years). As its application has expanded to ever more diverse marine environments, the nuances of 230Th systematics, with regard to particle type, particle size, lateral advective/diffusive redistribution, and other processes, have emerged. We synthesized over 1000 sedimentary records of 230Th from across the global ocean at two time slices, the late Holocene (0–5,000 years ago, or 0–5 ka) and the Last Glacial Maximum (18.5–23.5 ka), and investigated the spatial structure of 230Th-normalized mass fluxes. On a global scale, sedimentary mass fluxes were significantly higher during the Last Glacial Maximum (1.79–2.17 g/cm2kyr, 95% confidence) relative to the Holocene (1.48–1.68 g/cm2kyr, 95% confidence). We then examined the potential confounding influences of boundary scavenging, nepheloid layers, hydrothermal scavenging, size-dependent sediment fractionation, and carbonate dissolution on the efficacy of 230Th as a constant flux proxy. Anomalous 230Th behavior is sometimes observed proximal to hydrothermal ridges and in continental margins where high particle fluxes and steep continental slopes can lead to the combined effects of boundary scavenging and nepheloid interference. Notwithstanding these limitations, we found that 230Th normalization is a robust tool for determining sediment mass accumulation rates in the majority of pelagic marine settings (>1,000 m water depth).

Published
2022

30. The Transpolar Drift as a Source of Riverine and Shelf‐Derived Trace Elements to the Central Arctic Ocean

Author

Massachusetts Institute of Technology. Center for Global Change Science, Charette, Matthew A., Kipp, Lauren E., Jensen, Laramie T., Dabrowski, Jessica S., Whitmore, Laura M., Fitzsimmons, Jessica N., Williford, Tatiana, Ulfsbo, Adam, Jones, Elizabeth, Bundy, Randelle M., Vivancos, Sebastian M., Pahnke, Katharina, John, Seth G., Xiang, Yang, Hatta, Mariko, Petrova, Mariia V., Heimbürger‐Boavida, Lars‐Eric, Bauch, Dorothea, Newton, Robert, Pasqualini, Angelica, Agather, Alison M., Amon, Rainer M. W., Anderson, Robert F., Andersson, Per S., Benner, Ronald, Bowman, Katlin L., Edwards, R. Lawrence, Gdaniec, Sandra, Gerringa, Loes J. A., González, Aridane G., Granskog, Mats, Haley, Brian, Hammerschmidt, Chad R., Hansell, Dennis A., Henderson, Paul B., Kadko, David C., Kaiser, Karl, Laan, Patrick, Lam, Phoebe J., Lamborg, Carl H., Levier, Martin, Li, Xianglei, Margolin, Andrew R., Measures, Chris, Middag, Rob, Millero, Frank J., Moore, Willard S., Paffrath, Ronja, Planquette, Hélène, Rabe, Benjamin, Reader, Heather, Rember, Robert, Rijkenberg, Micha J. A., Roy‐Barman, Matthieu, Rutgers van der Loeff, Michiel, Saito, Mak, Schauer, Ursula, Schlosser, Peter, Sherrell, Robert M., Shiller, Alan M., Slagter, Hans, Sonke, Jeroen E., Stedmon, Colin, Woosley, Ryan J., Valk, Ole, Ooijen, Jan, Zhang, Ruifeng, Massachusetts Institute of Technology. Center for Global Change Science, Charette, Matthew A., Kipp, Lauren E., Jensen, Laramie T., Dabrowski, Jessica S., Whitmore, Laura M., Fitzsimmons, Jessica N., Williford, Tatiana, Ulfsbo, Adam, Jones, Elizabeth, Bundy, Randelle M., Vivancos, Sebastian M., Pahnke, Katharina, John, Seth G., Xiang, Yang, Hatta, Mariko, Petrova, Mariia V., Heimbürger‐Boavida, Lars‐Eric, Bauch, Dorothea, Newton, Robert, Pasqualini, Angelica, Agather, Alison M., Amon, Rainer M. W., Anderson, Robert F., Andersson, Per S., Benner, Ronald, Bowman, Katlin L., Edwards, R. Lawrence, Gdaniec, Sandra, Gerringa, Loes J. A., González, Aridane G., Granskog, Mats, Haley, Brian, Hammerschmidt, Chad R., Hansell, Dennis A., Henderson, Paul B., Kadko, David C., Kaiser, Karl, Laan, Patrick, Lam, Phoebe J., Lamborg, Carl H., Levier, Martin, Li, Xianglei, Margolin, Andrew R., Measures, Chris, Middag, Rob, Millero, Frank J., Moore, Willard S., Paffrath, Ronja, Planquette, Hélène, Rabe, Benjamin, Reader, Heather, Rember, Robert, Rijkenberg, Micha J. A., Roy‐Barman, Matthieu, Rutgers van der Loeff, Michiel, Saito, Mak, Schauer, Ursula, Schlosser, Peter, Sherrell, Robert M., Shiller, Alan M., Slagter, Hans, Sonke, Jeroen E., Stedmon, Colin, Woosley, Ryan J., Valk, Ole, Ooijen, Jan, and Zhang, Ruifeng

Published
2022

31. Contrasted release of insoluble elements (Fe, Al, rare earth elements, Th, Pa) after dust deposition in seawater: a tank experiment approach

Author

Roy-Barman, Matthieu, Foliot, Lorna, Douville, Eric, Leblond, Nathalie, Gazeau, Frédéric, Bressac, Matthieu, Wagener, Thibaut, Ridame, Céline, Desboeufs, Karine, Guieu, Cécile, Géochimie Des Impacts (GEDI), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Géochrononologie Traceurs Archéométrie (GEOTRAC), Institut de la Mer de Villefranche (IMEV), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'océanographie de Villefranche (LOV), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), University of Tasmania [Hobart, Australia] (UTAS), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Cycles biogéochimiques marins : processus et perturbations (CYBIOM), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN), Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)

Subjects
[SDE]Environmental Sciences
Abstract

Lithogenic elements such as aluminum (Al), iron (Fe), rare earth elements (REEs), thorium (232Th and 230Th, given as Th) and protactinium (Pa) are often assumed to be insoluble. In this study, their dissolution from Saharan dust reaching Mediterranean seawater was studied through tank experiments over 3 to 4 d under controlled conditions including controls without dust addition as well as dust seeding under present and future climate conditions (+3 ∘C and −0.3 pH). Unfiltered surface seawater from three oligotrophic regions (Tyrrhenian Sea, Ionian Sea and Algerian Basin) were used. The maximum dissolution was low for all seeding experiments: less than 0.3 % for Fe, 1 % for 232Th and Al, about 2 %–5 % for REEs and less than 6 % for Pa. Different behaviors were observed: dissolved Al increased until the end of the experiments, Fe did not dissolve significantly, and Th and light REEs were scavenged back on particles after a fast initial release. The constant 230Th/232Th ratio during the scavenging phase suggests that there is little or no further dissolution after the initial Th release. Quite unexpectedly, comparison of present and future conditions indicates that changes in temperature and/or pH influence the release of Th and REEs in seawater, leading to lower Th release and a higher light REE release under increased greenhouse conditions.

Published
2021
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32. Improved radiocesium purification in low-level radioactive soil and sediment samples prior to 135Cs/137Cs ratio measurement by ICP-MS/MS.

Author

Magre, Anaelle, Boulet, Beatrice, Pourcelot, Laurent, Roy-Barman, Matthieu, de Vismes Ott, Anne, and Ardois, Christophe

Subjects
SEDIMENT sampling, SOIL sampling, POLLUTION, RADIOACTIVE contamination, CESIUM, ANDOSOLS, ANTIMONY
Abstract

The 135Cs/137Cs isotopic ratio allows to characterize the potential sources of radioactive contamination in the environment. This ratio is usually determined in highly contaminated environmental samples by combining selective radiochemistry with mass spectrometry measurement. In contrast, few data are available at the environmental level of 137Cs (< 1 kBq.kg−1) due to the occurrence of interferents (Ba, Mo, Sb and Sn) in the mass range of interest and due to the very few radiocesium atoms. To obtain enough radiocesium from an environmental material with low levels of radioactivity, a large sample must be analyzed. In the present work, a new method of Cs extraction and purification has been developed allowing for the first time to analyze 100 g of ash of soil or sediment in only one week. The achieved chemical performances are excellent with a 137Cs recovery yield from soil and sediment samples, deduced from gamma spectrometry, above 80% and decontamination factors of 1.4 × 107, 5.7 × 104, 2.3 × 105 and 1.5 × 104 for Ba, Mo, Sb and Sn respectively. [ABSTRACT FROM AUTHOR]

Published
2022
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33. Quelle contribution de l’incendie de Notre-Dame à la pollution parisienne ? Tracer les plombs par leur signature isotopique

Author

Ayrault, Sophie, Bordier, Louise, Roy-Barman, Matthieu, Lestel, Laurence, Le Roux, Gaël, Syvilay, Delphine, Azema, Aurélia, L'Héritier, Maxime, Géochimie Des Impacts (GEDI), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols (METIS), École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Paris 8 Vincennes-Saint-Denis (UP8), Archéologies et Sciences de l'Antiquité (ArScAn), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Archéologie de la Gaule : structures économiques et sociales (GAMA), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), École pratique des hautes études (EPHE), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Institut national de recherches archéologiques préventives (Inrap)-Centre National de la Recherche Scientifique (CNRS), and Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Institut national de recherches archéologiques préventives (Inrap)-Centre National de la Recherche Scientifique (CNRS)-Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Institut national de recherches archéologiques préventives (Inrap)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDE]Environmental Sciences, [CHIM]Chemical Sciences, [SHS]Humanities and Social Sciences
Published
2020

34. Global ocean sediment composition and burial flux in the deep sea

Author

Hayes, Christopher T., Costa, Kassandra M., Anderson, Robert F., Calvo, Eva, Chase, Zanna, Demina, Ludmila L., Dutay, Jean-Claude, German, Christopher R., Heimbürger, Lars-Eric, Jaccard, Samuel L., Jacobel, Allison W., Kohfeld, Karen E., Kravchishina, Marina, Lippold, Jörg, Mekik, Figen, Missiaen, Lise, Pavia, Frank, Paytan, Adina, Pedrosa-Pamies, Rut, Petrova, Mariia V., Rahman, Shaily, Robinson, Laura F., Roy-Barman, Matthieu, Sanchez-Vidal, Anna, Shiller, Alan M., Tagliabue, Alessandro, Tessin, Allyson C., van Hulten, Marco, Zhang, Jing, Hayes, Christopher T., Costa, Kassandra M., Anderson, Robert F., Calvo, Eva, Chase, Zanna, Demina, Ludmila L., Dutay, Jean-Claude, German, Christopher R., Heimbürger, Lars-Eric, Jaccard, Samuel L., Jacobel, Allison W., Kohfeld, Karen E., Kravchishina, Marina, Lippold, Jörg, Mekik, Figen, Missiaen, Lise, Pavia, Frank, Paytan, Adina, Pedrosa-Pamies, Rut, Petrova, Mariia V., Rahman, Shaily, Robinson, Laura F., Roy-Barman, Matthieu, Sanchez-Vidal, Anna, Shiller, Alan M., Tagliabue, Alessandro, Tessin, Allyson C., van Hulten, Marco, and Zhang, Jing

Abstract

© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Hayes, C. T., Costa, K. M., Anderson, R. F., Calvo, E., Chase, Z., Demina, L. L., Dutay, J., German, C. R., Heimburger-Boavida, L., Jaccard, S. L., Jacobel, A., Kohfeld, K. E., Kravchishina, M. D., Lippold, J., Mekik, F., Missiaen, L., Pavia, F. J., Paytan, A., Pedrosa-Pamies, R., Petrova, M., V., Rahman, S., Robinson, L. F., Roy-Barman, M., Sanchez-Vidal, A., Shiller, A., Tagliabue, A., Tessin, A. C., van Hulten, M., & Zhang, J. Global ocean sediment composition and burial flux in the deep sea. Global Biogeochemical Cycles, 35(4), (2021): e2020GB006769, https://doi.org/10.1029/2020GB006769., Quantitative knowledge about the burial of sedimentary components at the seafloor has wide-ranging implications in ocean science, from global climate to continental weathering. The use of 230Th-normalized fluxes reduces uncertainties that many prior studies faced by accounting for the effects of sediment redistribution by bottom currents and minimizing the impact of age model uncertainty. Here we employ a recently compiled global data set of 230Th-normalized fluxes with an updated database of seafloor surface sediment composition to derive atlases of the deep-sea burial flux of calcium carbonate, biogenic opal, total organic carbon (TOC), nonbiogenic material, iron, mercury, and excess barium (Baxs). The spatial patterns of major component burial are mainly consistent with prior work, but the new quantitative estimates allow evaluations of deep-sea budgets. Our integrated deep-sea burial fluxes are 136 Tg C/yr CaCO3, 153 Tg Si/yr opal, 20Tg C/yr TOC, 220 Mg Hg/yr, and 2.6 Tg Baxs/yr. This opal flux is roughly a factor of 2 increase over previous estimates, with important implications for the global Si cycle. Sedimentary Fe fluxes reflect a mixture of sources including lithogenic material, hydrothermal inputs and authigenic phases. The fluxes of some commonly used paleo-productivity proxies (TOC, biogenic opal, and Baxs) are not well-correlated geographically with satellite-based productivity estimates. Our new compilation of sedimentary fluxes provides detailed regional and global information, which will help refine the understanding of sediment preservation., This study was supported by the Past Global Changes (PAGES) project, which in turn received support from the Swiss Academy of Sciences and the US-NSF. The work grew out of a 2018 workshop in Aix-Marseille, France, funded by PAGES, GEOTRACES, SCOR, US-NSF, Aix Marseille Université, and John Cantle Scientific, and the authors would like to acknowledge all attendees of this meeting. The authors acknowledge the participants of the 68th cruise of RV Akademik Mstislav Keldysh for helping acquire samples. Christopher T. Hayes acknowledges support from US-NSF awards 1658445 and 1737023. Some data compilation on Arctic shelf seas was supported by the Russian Science Foundation, grant number 20-17-00157. This work was also supported through project CRESCENDO (grant no. 641816, European Commission). Zanna Chase acknowledges support from the Australian Research Council’s Discovery Projects funding scheme (project DP180102357). Christopher R. German acknowledges US-NSF awards 1235248 and 1234827. Some colorbars used in the figures were designed by Kristen Thyng et al. (2016) and Patrick Rafter.

Published
2021

35. Global Ocean Sediment Composition and Burial Flux in the Deep Sea

Author

Swiss Academy of Sciences, National Science Foundation (US), Russian Science Foundation, European Commission, Australian Research Council, Agencia Estatal de Investigación (España), Hayes, Christopher T., Costa, Kassandra M., Anderson, Robert F., Calvo, Eva María, Chase, Zanna, Demina, Ludmila L., Dutay, Jean-Claude, German, Christopher R., Heimbürger-Boavida, Lars-Eric, Jaccard, Samuel L., Jacobel, Allison, Kohfeld, Karen E., Kravchishina, Marina D., Lippold, Jörg, Mekik, Figen, Missiaen, Lise, Pavia, Frank, Paytan, Adina, Pedrosa-Pàmies, Rut, Petrova, Mariia V., Rahman, Shaily, Robinson, Laura F., Roy-Barman, Matthieu, Sánchez-Vidal, Anna, Shiller, Alan M., Tagliabue, Alessandro, Tessin, Allyson C., Hulten, Marco van, Zhang, Jing, Swiss Academy of Sciences, National Science Foundation (US), Russian Science Foundation, European Commission, Australian Research Council, Agencia Estatal de Investigación (España), Hayes, Christopher T., Costa, Kassandra M., Anderson, Robert F., Calvo, Eva María, Chase, Zanna, Demina, Ludmila L., Dutay, Jean-Claude, German, Christopher R., Heimbürger-Boavida, Lars-Eric, Jaccard, Samuel L., Jacobel, Allison, Kohfeld, Karen E., Kravchishina, Marina D., Lippold, Jörg, Mekik, Figen, Missiaen, Lise, Pavia, Frank, Paytan, Adina, Pedrosa-Pàmies, Rut, Petrova, Mariia V., Rahman, Shaily, Robinson, Laura F., Roy-Barman, Matthieu, Sánchez-Vidal, Anna, Shiller, Alan M., Tagliabue, Alessandro, Tessin, Allyson C., Hulten, Marco van, and Zhang, Jing

Abstract

Quantitative knowledge about the burial of sedimentary components at the seafloor has wide‐ranging implications in ocean science, from global climate to continental weathering. The use of 230Th‐normalized fluxes reduces uncertainties that many prior studies faced by accounting for the effects of sediment redistribution by bottom currents and minimizing the impact of age model uncertainty. Here we employ a recently compiled global data set of 230Th‐normalized fluxes with an updated database of seafloor surface sediment composition to derive atlases of the deep‐sea burial flux of calcium carbonate, biogenic opal, total organic carbon (TOC), nonbiogenic material, iron, mercury, and excess barium (Baxs). The spatial patterns of major component burial are mainly consistent with prior work, but the new quantitative estimates allow evaluations of deep‐sea budgets. Our integrated deep‐sea burial fluxes are 136 Tg C/yr CaCO3, 153 Tg Si/yr opal, 20Tg C/yr TOC, 220 Mg Hg/yr, and 2.6 Tg Baxs/yr. This opal flux is roughly a factor of 2 increase over previous estimates, with important implications for the global Si cycle. Sedimentary Fe fluxes reflect a mixture of sources including lithogenic material, hydrothermal inputs and authigenic phases. The fluxes of some commonly used paleo‐productivity proxies (TOC, biogenic opal, and Baxs) are not well‐correlated geographically with satellite‐based productivity estimates. Our new compilation of sedimentary fluxes provides detailed regional and global information, which will help refine the understanding of sediment preservation

Published
2021

36. Global Ocean Sediment Composition and Burial Flux in the Deep Sea

Author

Hayes, Christopher T., primary, Costa, Kassandra M., additional, Anderson, Robert F., additional, Calvo, Eva, additional, Chase, Zanna, additional, Demina, Ludmila L., additional, Dutay, Jean‐Claude, additional, German, Christopher R., additional, Heimbürger‐Boavida, Lars‐Eric, additional, Jaccard, Samuel L., additional, Jacobel, Allison, additional, Kohfeld, Karen E., additional, Kravchishina, Marina D., additional, Lippold, Jörg, additional, Mekik, Figen, additional, Missiaen, Lise, additional, Pavia, Frank J., additional, Paytan, Adina, additional, Pedrosa‐Pamies, Rut, additional, Petrova, Mariia V., additional, Rahman, Shaily, additional, Robinson, Laura F., additional, Roy‐Barman, Matthieu, additional, Sanchez‐Vidal, Anna, additional, Shiller, Alan, additional, Tagliabue, Alessandro, additional, Tessin, Allyson C., additional, van Hulten, Marco, additional, and Zhang, Jing, additional

Published
2021
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37. Global Ocean Sediment Composition and Burial Flux in the Deep Sea

Author

Hayes, Christopher, primary, Costa, Kassandra M, additional, Anderson, Robert F, additional, Calvo, Eva, additional, Chase, Zanna, additional, Demina, Ludmila L, additional, Dutay, Jean-Claude, additional, German, Christopher R, additional, Heimbürger-Boavida, Lars-Eric, additional, Jaccard, Samuel L, additional, Jacobel, Allison, additional, Kohfeld, Karen E, additional, Kravchishina, Marina D, additional, Lippold, Jörg, additional, Mekik, Figen, additional, Missiaen, Lise, additional, Pavia, Frank J, additional, Paytan, Adina, additional, Pedrosa-Pamies, Rut, additional, Petrova, Mariia V, additional, Rahman, Shaily, additional, Robinson, Laura F, additional, Roy-Barman, Matthieu, additional, Sanchez-Vidal, Anna, additional, Shiller, Alan, additional, Tagliabue, Alessandro, additional, Tessin, Allyson C, additional, Van Hulten, Marco, additional, and Zhang, Jing, additional

Published
2021
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41. Supplementary material to &quot;Contrasted release of insoluble elements (Fe, Al, REE, Th, Pa) after dust deposition in seawater: a tank experiment approach&quot;

Author

Roy-Barman, Matthieu, primary, Folio, Lorna, additional, Douville, Eric, additional, Leblond, Nathalie, additional, Gazeau, Fréderic, additional, Bressac, Matthieu, additional, Wagener, Thibaut, additional, Ridame, Céline, additional, Desboeufs, Karine, additional, and Guieu, Cécile, additional

Published
2020
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42. The Transpolar Drift as a Source of Riverine and Shelf‐Derived Trace Elements to the Central Arctic Ocean

Author

Charette, Matthew A., primary, Kipp, Lauren E., additional, Jensen, Laramie T., additional, Dabrowski, Jessica S., additional, Whitmore, Laura M., additional, Fitzsimmons, Jessica N., additional, Williford, Tatiana, additional, Ulfsbo, Adam, additional, Jones, Elizabeth, additional, Bundy, Randelle M., additional, Vivancos, Sebastian M., additional, Pahnke, Katharina, additional, John, Seth G., additional, Xiang, Yang, additional, Hatta, Mariko, additional, Petrova, Mariia V., additional, Heimbürger‐Boavida, Lars‐Eric, additional, Bauch, Dorothea, additional, Newton, Robert, additional, Pasqualini, Angelica, additional, Agather, Alison M., additional, Amon, Rainer M. W., additional, Anderson, Robert F., additional, Andersson, Per S., additional, Benner, Ronald, additional, Bowman, Katlin L., additional, Edwards, R. Lawrence, additional, Gdaniec, Sandra, additional, Gerringa, Loes J. A., additional, González, Aridane G., additional, Granskog, Mats, additional, Haley, Brian, additional, Hammerschmidt, Chad R., additional, Hansell, Dennis A., additional, Henderson, Paul B., additional, Kadko, David C., additional, Kaiser, Karl, additional, Laan, Patrick, additional, Lam, Phoebe J., additional, Lamborg, Carl H., additional, Levier, Martin, additional, Li, Xianglei, additional, Margolin, Andrew R., additional, Measures, Chris, additional, Middag, Rob, additional, Millero, Frank J., additional, Moore, Willard S., additional, Paffrath, Ronja, additional, Planquette, Hélène, additional, Rabe, Benjamin, additional, Reader, Heather, additional, Rember, Robert, additional, Rijkenberg, Micha J. A., additional, Roy‐Barman, Matthieu, additional, Rutgers van der Loeff, Michiel, additional, Saito, Mak, additional, Schauer, Ursula, additional, Schlosser, Peter, additional, Sherrell, Robert M., additional, Shiller, Alan M., additional, Slagter, Hans, additional, Sonke, Jeroen E., additional, Stedmon, Colin, additional, Woosley, Ryan J., additional, Valk, Ole, additional, van Ooijen, Jan, additional, and Zhang, Ruifeng, additional

Published
2020
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43. Decrease in &lt;sup&gt;230&lt;/sup&gt;Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf?

Author

Valk, Ole, primary, Rutgers van der Loeff, Michiel M., additional, Geibert, Walter, additional, Gdaniec, Sandra, additional, Moran, S. Bradley, additional, Lepore, Kate, additional, Edwards, Robert Lawrence, additional, Lu, Yanbin, additional, Puigcorbé, Viena, additional, Casacuberta, Nuria, additional, Paffrath, Ronja, additional, Smethie, William, additional, and Roy-Barman, Matthieu, additional

Published
2020
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44. 230 Th Normalization: New Insights on an Essential Tool for Quantifying Sedimentary Fluxes in the Modern and Quaternary Ocean

Author

Costa, Kassandra M., primary, Hayes, Christopher T., additional, Anderson, Robert F., additional, Pavia, Frank J., additional, Bausch, Alexandra, additional, Deng, Feifei, additional, Dutay, Jean‐Claude, additional, Geibert, Walter, additional, Heinze, Christoph, additional, Henderson, Gideon, additional, Hillaire‐Marcel, Claude, additional, Hoffmann, Sharon, additional, Jaccard, Samuel L., additional, Jacobel, Allison W., additional, Kienast, Stephanie S., additional, Kipp, Lauren, additional, Lerner, Paul, additional, Lippold, Jörg, additional, Lund, David, additional, Marcantonio, Franco, additional, McGee, David, additional, McManus, Jerry F., additional, Mekik, Figen, additional, Middleton, Jennifer L., additional, Missiaen, Lise, additional, Not, Christelle, additional, Pichat, Sylvain, additional, Robinson, Laura F., additional, Rowland, George H., additional, Roy‐Barman, Matthieu, additional, Tagliabue, Alessandro, additional, Torfstein, Adi, additional, Winckler, Gisela, additional, and Zhou, Yuxin, additional

Published
2020
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45. The Composition and Flux of Seafloor Sediments in the Global Ocean

Author

Hayes, Christopher T., Costa, Kassandra M., Calvo, Eva María, Chase, Zanna, Demina, Ludmila L., Dutay, Jean-Claude, German, Christopher R., Heimbürger-Boavida, Lars-Eric, Jaccard, Samuel L., Jacobel, Allison, Kohfeld, Karen E., Kravchishina, Marina D., Lippold, Jörg, Mekik, Figen, Missiaen, Lise, Pavia, Frank, Paytan, Adina, Petrova, Mariia V., Pedrosa-Pàmies, Rut, Rahman, Shaily, Robinson, Laura F., Roy-Barman, Matthieu, Sánchez-Vidal, Anna, Shiller, Alan M., Tagliabue, Alessandro, Tessin, Allyson C., Hulten, Marco van, and Zhang, Jing

Abstract

American Geophysical Union (AGU) Fall Meeting, 13-17 December 2021, New Orleans, Quantitative knowledge about the burial of sedimentary components at the seafloor has wide-ranging implications in ocean science, from global climate to continental weathering. The use of 230Th-normalized fluxes reduces uncertainties that many prior studies faced by accounting for the effects of sediment redistribution by bottom currents and minimizing the impact of age model uncertainty. Here we employ a recently compiled global dataset of 230Th-normalized fluxes with an updated database of seafloor surface sediment composition to derive global maps of the burial flux of calcium carbonate, biogenic opal, total organic carbon (TOC), non-biogenic material, iron, mercury, and excess barium (Ba xs). The spatial patterns of burial of the major components are consistent with prior work, but the new quantitative estimates allow evaluations of global elemental budgets including many marginal seas that were previous data gaps. Our globally-integrated marine burial fluxes are 139 Tg C/yr CaCO3, 179 Tg Si/yr opal, 21Tg C/yr TOC, and 220 Mg Hg/yr. Sedimentary Fe fluxes reflect a mixture of sources including lithogenic material, hydrothermal inputs and authigenic phases. The fluxes of some commonly used paleo-productivity proxies (TOC, biogenic opal, and Ba xs) are not well-correlated geographically with satellite-based productivity estimates on the global scale. Our new compilation of sedimentary fluxes provides more detailed information on burial fluxes, which should lead to substantial improvements in the understanding of how preservation affects these paleoproxies

Published
2020

46. Decrease in 230Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf?

Author

Valk, Ole, Rutgers Van Der Loeff, Michiel, Geibert, Walter, Gdaniec, Sandra, Moran, S. Bradley, Lepore, Kate, Edwards, Robert Lawrence, Lu, Yanbin, Puigcorbe, Viena, Casacuberta, Nuria, Paffrath, Ronja, Smethie, William, Roy-Barman, Matthieu, Alfred Wegener Institute for Polar and Marine Research (AWI), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Stockholm University, University of Alaska [Fairbanks] (UAF), Mount Holyoke College, University of Minnesota System, Nanyang Technological University [Singapour], Edith Cowan University (ECU), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), University of Oldenburg, Lamont-Doherty Earth Observatory (LDEO), Columbia University [New York], Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Géochimie Des Impacts (GEDI), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO)-Planning and Transport Research Centre (PATREC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Panoply, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Abstract

This study provides dissolved and particulate 230Th and 232Th results as well as particulate 234Th data collected during expeditions to the central Arctic Ocean (GEOTRACES, an international project to identify processes and quantify fluxes that control the distributions of trace elements; sections GN04 and GIPY11). Constructing a time series of dissolved 230Th from 1991 to 2015 enables the identification of processes that control the temporal development of 230Th distributions in the Amundsen Basin. After 2007, 230Th concentrations decreased significantly over the entire water column, particularly between 300 and 1500 m. This decrease is accompanied by a circulation change, evidenced by a concomitant increase in salinity. A potentially increased inflow of water of Atlantic origin with low dissolved 230Th concentrations leads to the observed depletion in dissolved 230Th in the central Arctic. Because atmospherically derived tracers (chlorofluorocarbon (CFC), sulfur hexafluoride (SF6)) do not reveal an increase in ventilation rate, it is suggested that these interior waters have undergone enhanced scavenging of Th during transit from Fram Strait and the Barents Sea to the central Amundsen Basin. The 230Th depletion propagates downward in the water column by settling particles and reversible scavenging.

Published
2020
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47. Circulation changes in the Amundsen Basin from 1991 to 2015 revealed from distributions of dissolved 230Th

Author

Valk, Ole, Rutgers van der Loeff, Michiel M., Geibert, Walter, Gdaniec, Sandra, Moran, S. Bradley, Lepore, Kate, Edwards, Robert Lawrence, Lu, Yanbin, Puigcorbé, Viena, Casacuberta, Nuria, Paffrath, Ronja, Smethie, William, and Roy-Barman, Matthieu

Abstract

This study provides dissolved and particulate 230Th and 232Th results as well as particulate 234Th data collected during expeditions to the central Arctic Ocean on ARK-XXIX/3 (2015) and ARK-XXII/2 (2007) (GEOTRACES sections GN04 and GIPY11, respectively). Constructing a time-series of dissolved 230Th from 1991 to 2015 enables the identification of processes that control the temporal development of 230Th distributions in the Amundsen Basin. After 2007, 230Th concentrations decreased significantly over the entire water column, particularly between 300 m and 1500 m. This decrease is accompanied by a circulation change, evidenced by a concomitant increase in salinity. Potentially increased inflow of water of Atlantic origin with low dissolved 230Th concentrations leads to the observed depletion in dissolved 230Th in the central Arctic. Because atmospherically derived tracers (CFC, 3He/3H) do not reveal an increase in ventilation rate, it is suggested that these interior waters have undergone enhanced scavenging of Th during transit from the Fram Strait and the Barents Sea to the central Amundsen Basin. The 230Th depletion propagates downward in the water column by settling particles and reversible scavenging. Taken together, the temporal evolution of Th distributions point to significant changes in the large-scale circulation of the Amundsen Basin.

Published
2019

48. The Transpolar Drift as a Source of Riverine and Shelf-Derived Trace Elements to the Central Arctic Ocean

Author

Charette, Matthew A., Kipp, Lauren E., Jensen, Laramie T., Dabrowski, Jessica S., Whitmore, Laura M., Fitzsimmons, Jessica N., Williford, Tatiana, Ulfsbo, Adam, Jones, Elizabeth, Bundy, Randelle M., Vivancos, Sebastian M., Pahnke, Katharina, John, Seth G., Xiang, Yang, Hatta, Mariko, Petrova, Mariia V., Heimbürger-boavida, Lars-eric, Bauch, Dorothea, Newton, Robert, Pasqualini, Angelica, Agather, Alison M., Amon, Rainer M.w., Anderson, Robert F., Andersson, Per S., Benner, Ronald, Bowman, Katlin L., Edwards, R. Lawrence, Gdaniec, Sandra, Gerringa, Loes J.a., González, Aridane G., Granskog, Mats, Haley, Brian, Hammerschmidt, Chad R., Hansell, Dennis A., Henderson, Paul B., Kadko, David C., Kaiser, Karl, Laan, Patrick, Lam, Phoebe J., Lamborg, Carl H., Levier, Martin, Li, Xianglei, Margolin, Andrew R., Measures, Chris, Middag, Rob, Millero, Frank J., Moore, Willard S., Paffrath, Ronja, Planquette, Helene, Rabe, Benjamin, Reader, Heather, Rember, Robert, Rijkenberg, Micha J.a., Roy-barman, Matthieu, Rutgers Van Der Loeff, Michiel, Saito, Mak, Schauer, Ursula, Schlosser, Peter, Sherrell, Robert M., Shiller, Alan M., Slagter, Hans, Sonke, Jeroen E., Stedmon, Colin, Woosley, Ryan J., Valk, Ole, Van Ooijen, Jan, Zhang, Ruifeng, Charette, Matthew A., Kipp, Lauren E., Jensen, Laramie T., Dabrowski, Jessica S., Whitmore, Laura M., Fitzsimmons, Jessica N., Williford, Tatiana, Ulfsbo, Adam, Jones, Elizabeth, Bundy, Randelle M., Vivancos, Sebastian M., Pahnke, Katharina, John, Seth G., Xiang, Yang, Hatta, Mariko, Petrova, Mariia V., Heimbürger-boavida, Lars-eric, Bauch, Dorothea, Newton, Robert, Pasqualini, Angelica, Agather, Alison M., Amon, Rainer M.w., Anderson, Robert F., Andersson, Per S., Benner, Ronald, Bowman, Katlin L., Edwards, R. Lawrence, Gdaniec, Sandra, Gerringa, Loes J.a., González, Aridane G., Granskog, Mats, Haley, Brian, Hammerschmidt, Chad R., Hansell, Dennis A., Henderson, Paul B., Kadko, David C., Kaiser, Karl, Laan, Patrick, Lam, Phoebe J., Lamborg, Carl H., Levier, Martin, Li, Xianglei, Margolin, Andrew R., Measures, Chris, Middag, Rob, Millero, Frank J., Moore, Willard S., Paffrath, Ronja, Planquette, Helene, Rabe, Benjamin, Reader, Heather, Rember, Robert, Rijkenberg, Micha J.a., Roy-barman, Matthieu, Rutgers Van Der Loeff, Michiel, Saito, Mak, Schauer, Ursula, Schlosser, Peter, Sherrell, Robert M., Shiller, Alan M., Slagter, Hans, Sonke, Jeroen E., Stedmon, Colin, Woosley, Ryan J., Valk, Ole, Van Ooijen, Jan, and Zhang, Ruifeng

Abstract

A major surface circulation feature of the Arctic Ocean is the Transpolar Drift (TPD), a current that transports river‐influenced shelf water from the Laptev and East Siberian Seas toward the center of the basin and Fram Strait. In 2015, the international GEOTRACES program included a high‐resolution pan‐Arctic survey of carbon, nutrients, and a suite of trace elements and isotopes (TEIs). The cruises bisected the TPD at two locations in the central basin, which were defined by maxima in meteoric water and dissolved organic carbon concentrations that spanned 600 km horizontally and ~25‐50 m vertically. Dissolved TEIs such as Fe, Co, Ni, Cu, Hg, Nd, and Th, which are generally particle‐reactive but can be complexed by organic matter, were observed at concentrations much higher than expected for the open ocean setting. Other trace element concentrations such as Al, V, Ga, and Pb were lower than expected due to scavenging over the productive East Siberian and Laptev shelf seas. Using a combination of radionuclide tracers and ice drift modeling, the transport rate for the core of the TPD was estimated at 0.9 ± 0.4 Sv (106 m3 s‐1). This rate was used to derive the mass flux for TEIs that were enriched in the TPD, revealing the importance of lateral transport in supplying materials beneath the ice to the central Arctic Ocean and potentially to the North Atlantic Ocean via Fram Strait. Continued intensification of the Arctic hydrologic cycle and permafrost degradation will likely lead to an increase in the flux of TEIs into the Arctic Ocean.

Published
2020
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49. Contrasted release of insoluble elements (Fe, Al, rare earth elements, Th, Pa) after dust deposition in seawater: a tank experiment approach

Author

Roy-barman, Matthieu, Foliot, Lorna, Douville, Eric, Leblond, Nathalie, Gazeau, Frédéric, Bressac, Matthieu, Wagener, Thibaut, Ridame, Céline, Desboeufs, Karine, Guieu, Cécile, Roy-barman, Matthieu, Foliot, Lorna, Douville, Eric, Leblond, Nathalie, Gazeau, Frédéric, Bressac, Matthieu, Wagener, Thibaut, Ridame, Céline, Desboeufs, Karine, and Guieu, Cécile

Abstract

The release of lithogenic elements (which are often assumed to be insoluble) such as Aluminum (Al), Iron (Fe), Rare Earth Elements (REE), Thorium (Th) and Protactinium (Pa) by Saharan dust reaching Mediterranean seawater was studied through tank experiments over 3 to 4 days under controlled conditions including control without dust addition and dust seeding under present and future climate conditions (+3 °C and −0.3 pH unit). Unfiltered surface seawater from 3 oligotrophic regions (Tyrrhenian Sea, Ionian Sea and Algerian Basin) were used. The maximum dissolution fractions were low for all seeding experiments: less than 0.3 % for Fe, 1 % for 232Th and Al, about 2–5 % for REE and less than 6 % for Pa. Different behaviors were observed: dissolved Al increased until the end of the experiments, Fe did not dissolve significantly and Th and light REE were scavenged back on the particles after a fast initial release. The constant 230Th/232Th ratio during the scavenging phase suggests that there is little or no further dissolution after the initial Th release. Quite unexpectedly, comparison of present and future conditions indicates that changes in temperature and/or pH influence the release of thorium and REE in seawater, leading to a lower Th release and a higher light REE release under increased greenhouse conditions.

Published
2020
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50. 231Pa and 230Th in the Arctic Ocean : Implications for boundary scavenging and 231Pa-230Th fractionation in the Eurasian Basin

Author

Gdaniec, Sandra, Roy-Barman, Matthieu, Levier, Martin, Valk, Ole, van der Loeff, Michiel Rutgers, Foliot, Lorna, Dapoigny, Arnaud, Missiaen, Lise, Mörth, Carl-Magnus, Andersson, Per S., Gdaniec, Sandra, Roy-Barman, Matthieu, Levier, Martin, Valk, Ole, van der Loeff, Michiel Rutgers, Foliot, Lorna, Dapoigny, Arnaud, Missiaen, Lise, Mörth, Carl-Magnus, and Andersson, Per S.

Abstract

231Pa, 230Th and 232Th were analyzed in filtered seawater (n=70) and suspended particles (n=39) collectedalong a shelf-basin transect from the Barents shelf to the Makarov Basin in the Arctic Ocean during GEOTRACESsection GN04 in 2015. The distribution of dissolved 231Pa and 230Th in the Arctic Ocean deviates from the linearincrease expected from reversible scavenging. Higher 232Th concentrations were observed at the shelf, slope andin surface waters in the deep basin, pointing at lithogenic sources. Fractionation factors (FTh/Pa) observed at theNansen margin were higher compared to FTh/Pa in the central Nansen Basin, possibly due to the residual occurrenceof hydrothermal particles in the deep central Nansen Basin. Application of a boundary scavengingmodel quantitatively accounts for the dissolved and particulate 230Th distributions in the Nansen Basin.Modelled dissolved 231Pa distributions were largely overestimated, which was attributed to the absence of incorporation of water exchange with the Atlantic Ocean in the model. 231Pa/230Th ratios of the suspended particlesof the Nansen Basin were below the 231Pa/230Th production ratio, but top-core sediments of the Nansenmargin and slope have high 231Pa/230Th-ratios, suggesting that scavenging along the Nansen margin partly actsas a sink for the missing Arctic 231Pa., GEOTRACES

Published
2020
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