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Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean
The hydrological cycle is expected to intensify in a warming climate. However, observational evidence of such changes in the Southern Ocean is difficult to obtain due to sparse measurements and a complex superposition of changes in precipitation, sea ice, and glacial meltwater. Here we disentangle t...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10183002/ https://www.ncbi.nlm.nih.gov/pubmed/37179409 http://dx.doi.org/10.1038/s41467-023-38425-5 |
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author | Akhoudas, Camille Hayatte Sallée, Jean-Baptiste Reverdin, Gilles Haumann, F. Alexander Pauthenet, Etienne Chapman, Christopher C. Margirier, Félix Lo Monaco, Claire Metzl, Nicolas Meilland, Julie Stranne, Christian |
author_facet | Akhoudas, Camille Hayatte Sallée, Jean-Baptiste Reverdin, Gilles Haumann, F. Alexander Pauthenet, Etienne Chapman, Christopher C. Margirier, Félix Lo Monaco, Claire Metzl, Nicolas Meilland, Julie Stranne, Christian |
author_sort | Akhoudas, Camille Hayatte |
collection | PubMed |
description | The hydrological cycle is expected to intensify in a warming climate. However, observational evidence of such changes in the Southern Ocean is difficult to obtain due to sparse measurements and a complex superposition of changes in precipitation, sea ice, and glacial meltwater. Here we disentangle these signals using a dataset of salinity and seawater oxygen isotope observations collected in the Indian sector of the Southern Ocean. Our results show that the atmospheric water cycle has intensified in this region between 1993 and 2021, increasing the salinity in subtropical surface waters by 0.06 ± 0.07 g kg(−1) per decade, and decreasing the salinity in subpolar surface waters by -0.02 ± 0.01 g kg(−1) per decade. The oxygen isotope data allow to discriminate the different freshwater processes showing that in the subpolar region, the freshening is largely driven by the increase in net precipitation (by a factor two) while the decrease in sea ice melt is largely balanced by the contribution of glacial meltwater at these latitudes. These changes extend the growing evidence for an acceleration of the hydrological cycle and a melting cryosphere that can be expected from global warming. |
format | Online Article Text |
id | pubmed-10183002 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-101830022023-05-15 Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean Akhoudas, Camille Hayatte Sallée, Jean-Baptiste Reverdin, Gilles Haumann, F. Alexander Pauthenet, Etienne Chapman, Christopher C. Margirier, Félix Lo Monaco, Claire Metzl, Nicolas Meilland, Julie Stranne, Christian Nat Commun Article The hydrological cycle is expected to intensify in a warming climate. However, observational evidence of such changes in the Southern Ocean is difficult to obtain due to sparse measurements and a complex superposition of changes in precipitation, sea ice, and glacial meltwater. Here we disentangle these signals using a dataset of salinity and seawater oxygen isotope observations collected in the Indian sector of the Southern Ocean. Our results show that the atmospheric water cycle has intensified in this region between 1993 and 2021, increasing the salinity in subtropical surface waters by 0.06 ± 0.07 g kg(−1) per decade, and decreasing the salinity in subpolar surface waters by -0.02 ± 0.01 g kg(−1) per decade. The oxygen isotope data allow to discriminate the different freshwater processes showing that in the subpolar region, the freshening is largely driven by the increase in net precipitation (by a factor two) while the decrease in sea ice melt is largely balanced by the contribution of glacial meltwater at these latitudes. These changes extend the growing evidence for an acceleration of the hydrological cycle and a melting cryosphere that can be expected from global warming. Nature Publishing Group UK 2023-05-13 /pmc/articles/PMC10183002/ /pubmed/37179409 http://dx.doi.org/10.1038/s41467-023-38425-5 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Akhoudas, Camille Hayatte Sallée, Jean-Baptiste Reverdin, Gilles Haumann, F. Alexander Pauthenet, Etienne Chapman, Christopher C. Margirier, Félix Lo Monaco, Claire Metzl, Nicolas Meilland, Julie Stranne, Christian Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean |
title | Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean |
title_full | Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean |
title_fullStr | Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean |
title_full_unstemmed | Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean |
title_short | Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean |
title_sort | isotopic evidence for an intensified hydrological cycle in the indian sector of the southern ocean |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10183002/ https://www.ncbi.nlm.nih.gov/pubmed/37179409 http://dx.doi.org/10.1038/s41467-023-38425-5 |
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