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9 results on '"Muller, Sofia"'

1. Nitrous oxide dynamics in the Kara Sea, Arctic Ocean.

Author

Muller, Sofia, Fripiat, François, Jaccard, Samuel L., Ponsoni, Leandro, Hölemann, Jens A., Martínez-García, Alfredo, and Delille, Bruno

Subjects
SEA ice, ARCTIC exploration, NITROGEN cycle, NITROUS oxide, CONTINENTAL shelf
Abstract

Previous studies have reported an accumulation of nitrous oxide (N2O) on shallow continental shelves of the western Arctic Ocean. In this study, we sampled seawater profiles for N2O measurements in the eastern Arctic shelves, in the North Kara Sea, in the context of the Arctic Century Expedition. Despite some variability in the vertical distribution, we typically observe an accumulation of N2O in shelf bottom waters, which correlates with a fixed nitrogen (N) deficit. Longer residence times on the shelf promote greater N2O enrichment and a larger fixed N deficit. These observations point towards N2O production at depth, linked to benthic denitrification processes that are intensified on productive shelve areas. However, in surface waters, physical processes – i.e. temperature-dependent solubility and air-sea exchange – emerge as the main factor controlling N2O concentrations. We observe low saturations of 80% at the surface of open ocean stations influenced by water that has previously flowed beneath sea ice. Arctic surface water becomes undersaturated due to cooling and remains undersaturated due to limited air-sea exchange. River supply does not exert a discernable influence on N2O concentrations of the studied area. This study reveals the potential of the Arctic Siberian shelves as a sink of atmospheric N2O during the summer. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Nitrous oxide dynamics in the Arctic Siberian shelves of the North Kara Sea during summer 2021

Author

EGU General Assembly 2024 (14-19 April 2024: Vienna), Muller, Sofia, Fripiat, François, Martínez-García, Alfredo, Jaccard, Samuel L., Jens A. Hölemann, Delille, Bruno, EGU General Assembly 2024 (14-19 April 2024: Vienna), Muller, Sofia, Fripiat, François, Martínez-García, Alfredo, Jaccard, Samuel L., Jens A. Hölemann, and Delille, Bruno

Abstract

info:eu-repo/semantics/nonPublished

Published
2024

4. Glacier meltwater, a potential source of methane in West Antarctica Peninsula

Author

EGU General Assembly (14-19 April 2024: Vienna), Axelle, Brusselman, Crabeck, Odile, Muller, Sofia, Pablo Alejandro, Araujo, Martin, Dogniez, Lepoint, Gilles, Loïc, Michel, Danis, Bruno, Manuel, Dall'Osto, Fripiat, François, Delille, Bruno, EGU General Assembly (14-19 April 2024: Vienna), Axelle, Brusselman, Crabeck, Odile, Muller, Sofia, Pablo Alejandro, Araujo, Martin, Dogniez, Lepoint, Gilles, Loïc, Michel, Danis, Bruno, Manuel, Dall'Osto, Fripiat, François, and Delille, Bruno

Abstract

info:eu-repo/semantics/nonPublished

Published
2024

5. Thin and transient meltwater layers and false bottoms in the Arctic sea ice pack—Recent insights on these historically overlooked features

Author

Smith, Madison M, Angot, Hélène, Chamberlain, Emelia J, Droste, Elise S, Karam, Salar, Muilwijk, Morven, Webb, Alison L, Archer, Stephen D, Beck, Ivo, Blomquist, Byron W, Bowman, Jeff, Boyer, Matthew, Bozzato, Deborah, Chierici, Melissa, Creamean, Jessie, D’Angelo, Alessandra, Delille, Bruno, Fer, Ilker, Fong, Allison A, Fransson, Agneta, Fuchs, Niels, Gardner, Jessie, Granskog, Mats A, Hoppe, Clara JM, Hoppema, Mario, Hoppmann, Mario, Mock, Thomas, Muller, Sofia, Müller, Oliver, Nicolaus, Marcel, Nomura, Daiki, Petäjä, Tuukka, Salganik, Evgenii, Schmale, Julia, Schmidt, Katrin, Schulz, Kirstin M, Shupe, Matthew D, Stefels, Jacqueline, Thielke, Linda, Tippenhauer, Sandra, Ulfsbo, Adam, van Leeuwe, Maria, Webster, Melinda, Yoshimura, Masaki, Zhan, Liyang, Smith, Madison M, Angot, Hélène, Chamberlain, Emelia J, Droste, Elise S, Karam, Salar, Muilwijk, Morven, Webb, Alison L, Archer, Stephen D, Beck, Ivo, Blomquist, Byron W, Bowman, Jeff, Boyer, Matthew, Bozzato, Deborah, Chierici, Melissa, Creamean, Jessie, D’Angelo, Alessandra, Delille, Bruno, Fer, Ilker, Fong, Allison A, Fransson, Agneta, Fuchs, Niels, Gardner, Jessie, Granskog, Mats A, Hoppe, Clara JM, Hoppema, Mario, Hoppmann, Mario, Mock, Thomas, Muller, Sofia, Müller, Oliver, Nicolaus, Marcel, Nomura, Daiki, Petäjä, Tuukka, Salganik, Evgenii, Schmale, Julia, Schmidt, Katrin, Schulz, Kirstin M, Shupe, Matthew D, Stefels, Jacqueline, Thielke, Linda, Tippenhauer, Sandra, Ulfsbo, Adam, van Leeuwe, Maria, Webster, Melinda, Yoshimura, Masaki, and Zhan, Liyang

Abstract

The rapid melt of snow and sea ice during the Arctic summer provides a significant source of low-salinity meltwater to the surface ocean on the local scale. The accumulation of this meltwater on, under, and around sea ice floes can result in relatively thin meltwater layers in the upper ocean. Due to the small-scale nature of these upper-ocean features, typically on the order of 1 m thick or less, they are rarely detected by standard methods, but are nevertheless pervasive and critically important in Arctic summer. Observations during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition in summer 2020 focused on the evolution of such layers and made significant advancements in understanding their role in the coupled Arctic system. Here we provide a review of thin meltwater layers in the Arctic, with emphasis on the new findings from MOSAiC. Both prior and recent observational datasets indicate an intermittent yet longlasting (weeks to months) meltwater layer in the upper ocean on the order of 0.1 m to 1.0 m in thickness, with a large spatial range. The presence of meltwater layers impacts the physical system by reducing bottom ice melt and allowing new ice formation via false bottom growth. Collectively, the meltwater layer and false bottoms reduce atmosphere-ocean exchanges of momentum, energy, and material.The impacts on the coupled Arctic system are far-reaching, including acting as a barrier for nutrient and gas exchange and impacting ecosystem diversity and productivity.

Published
2023

6. The role of sea ice in the carbon cycle of polar oceans

Author

Southern Ocean Observing System Symposium (14-18 August 2023: Hobart, Australia), Moreau, Sébastien, Vancoppenolle, Martin, Crabeck, Odile, Delille, B., Brown, Karina, Campbell, Karley, Chierici, Melissa M.C., Else, Brent, Fransson, Agneta A.F., Fripiat, François, Geilfus, Nicolas Xavier, Jones, Elisabeth, Lannuzel, Delphine, Laenger, J, Meiners, K., Miller, L., Muller, Sofia, Nomura, Daïki, Rysgaard, Søren, Steiner, Nadja, Thomas, D., Tison, Jean-Louis, Southern Ocean Observing System Symposium (14-18 August 2023: Hobart, Australia), Moreau, Sébastien, Vancoppenolle, Martin, Crabeck, Odile, Delille, B., Brown, Karina, Campbell, Karley, Chierici, Melissa M.C., Else, Brent, Fransson, Agneta A.F., Fripiat, François, Geilfus, Nicolas Xavier, Jones, Elisabeth, Lannuzel, Delphine, Laenger, J, Meiners, K., Miller, L., Muller, Sofia, Nomura, Daïki, Rysgaard, Søren, Steiner, Nadja, Thomas, D., and Tison, Jean-Louis

Abstract

info:eu-repo/semantics/nonPublished

Published
2023

7. Critically important, yet forgotten: thin and transient meltwater layers and false bottoms in the Arctic sea ice pack

Author

Smith, Madison M., Angot, Helene, Chamberlain, Emelia J., Droste, Elise, Karam, Salar, Muilwijk, Morven, Webb, Alison, Archer, Stephen, Beck, Ivo, Blomquist, Byron, Bowman, Jeff, Boyer, Matthew, Bozzato, Deborah, Chierici, Melissa, Creamean, Jessie, D'Angelo, Alessandra, Delille, Bruno, Fer, Ilker, Fong, Allison A., Fransson, Agneta, Fuchs, Niels, Gardner, Jessie, Granskog, Mats A., Hoppe, Clara J. M., Hoppema, Mario, Hoppmann, Mario, Mock, Thomas, Muller, Sofia, Müller, Oliver, Nicolaus, Marcel, Nomura, Daiki, Petäjä, Tuukka, Salganik, Evgenii, Schmale, Julia, Schmidt, Katrin, Schulz, Kirstin, Shupe, Matthew D., Stefels, Jacqueline, Thielke, Linda, Tippenhauer, Sandra, Ulfsbo, Adam, van Leeuwe, Maria, Webster, Melinda, Yoshimura, Masaki, and Zhan, Liyang

Subjects
Arctic, meltwater, interdisciplinary science, sea ice
Abstract

The rapid melt of snow and sea ice during the Arctic summer provides a significant source of low-salinity meltwater to the surface ocean on the local scale. The accumulation of this meltwater on, under, and around sea ice floes can result in relatively thin meltwater layers in the upper ocean. Due to the small-scale nature of these upper-ocean features, typically on the order of 1 m thick or less, they are rarely detected by standard methods, but are nevertheless pervasive and critically important in Arctic summer. Observations during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition in summer 2020 focused on the evolution of such layers and made significant advancements in understanding their role in the coupled Arctic system. Here we provide a review of thin meltwater layers in the Arctic, with emphasis on the new findings from MOSAiC. Both prior and recent observational datasets indicate an intermittent yet long-lasting (weeks to months) meltwater layer in the upper ocean on the order of 0.1 to 1.0 m in thickness, with a large spatial range. The presence of meltwater layers impacts the physical system by reducing bottom ice melt and allowing new ice formation via false bottom growth. Collectively, the meltwater layer and false bottoms reduce atmosphere-ocean exchanges of momentum, energy, and material. The impacts on the coupled Arctic system are far-reaching, including acting as a barrier for nutrient and gas exchange and impacting ecosystem diversity and productivity.

Published
2023
Full Text
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8. Thin and transient meltwater layers and false bottoms in the Arctic sea ice pack—Recent insights on these historically overlooked features

Author

Smith, Madison M., primary, Angot, Hélène, additional, Chamberlain, Emelia J., additional, Droste, Elise S., additional, Karam, Salar, additional, Muilwijk, Morven, additional, Webb, Alison L., additional, Archer, Stephen D., additional, Beck, Ivo, additional, Blomquist, Byron W., additional, Bowman, Jeff, additional, Boyer, Matthew, additional, Bozzato, Deborah, additional, Chierici, Melissa, additional, Creamean, Jessie, additional, D’Angelo, Alessandra, additional, Delille, Bruno, additional, Fer, Ilker, additional, Fong, Allison A., additional, Fransson, Agneta, additional, Fuchs, Niels, additional, Gardner, Jessie, additional, Granskog, Mats A., additional, Hoppe, Clara J. M., additional, Hoppema, Mario, additional, Hoppmann, Mario, additional, Mock, Thomas, additional, Muller, Sofia, additional, Müller, Oliver, additional, Nicolaus, Marcel, additional, Nomura, Daiki, additional, Petäjä, Tuukka, additional, Salganik, Evgenii, additional, Schmale, Julia, additional, Schmidt, Katrin, additional, Schulz, Kirstin M., additional, Shupe, Matthew D., additional, Stefels, Jacqueline, additional, Thielke, Linda, additional, Tippenhauer, Sandra, additional, Ulfsbo, Adam, additional, van Leeuwe, Maria, additional, Webster, Melinda, additional, Yoshimura, Masaki, additional, and Zhan, Liyang, additional

Published
2023
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9. Seasonal dynamics of nitrous oxide in sea ice of the Central Arctic: insights from the MOSAiC Expedition

Author

International MOSAiC Science Conference and Workshop (25 April 2022 - 29 April 2022: Bremerhaven), Muller, Sofia, Abrahamsson, K, Angelopoulos, M, Bauch, D, Crabeck, Odile, Damm, Ellen, D'Angelo, A., Fripiat, François, Nomura, Daïki, Van Hanja, J, Zhan, Liyang L.Z., Delille, B., International MOSAiC Science Conference and Workshop (25 April 2022 - 29 April 2022: Bremerhaven), Muller, Sofia, Abrahamsson, K, Angelopoulos, M, Bauch, D, Crabeck, Odile, Damm, Ellen, D'Angelo, A., Fripiat, François, Nomura, Daïki, Van Hanja, J, Zhan, Liyang L.Z., and Delille, B.

Abstract

info:eu-repo/semantics/nonPublished

Published
2022

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