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. We here disentangle t...
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2022
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ftarchimer:oai:archimer.ifremer.fr:90144 2023-05-15T18:17:46+02:00 Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean Hayatte Akhoudas, Camille Sallée, Jean-baptiste Reverdin, Gilles Haumann, Alexander F. Pauthenet, Etienne Chapman, Christopher Margirier, Félix Lo Monaco, Claire Metzl, Nicolas Meilland, Julie Stranne, Christian 2022-08-24 application/pdf https://archimer.ifremer.fr/doc/00789/90144/95727.pdf https://archimer.ifremer.fr/doc/00789/90144/95728.pdf https://doi.org/10.21203/rs.3.rs-1952513/v1 https://archimer.ifremer.fr/doc/00789/90144/ eng eng Research Square Platform LLC https://archimer.ifremer.fr/doc/00789/90144/95727.pdf https://archimer.ifremer.fr/doc/00789/90144/95728.pdf doi:10.21203/rs.3.rs-1952513/v1 https://archimer.ifremer.fr/doc/00789/90144/ info:eu-repo/semantics/openAccess restricted use Under review Natureportfolio (Research Square Platform LLC) In Press text Publication info:eu-repo/semantics/article 2022 ftarchimer https://doi.org/10.21203/rs.3.rs-1952513/v1 2022-09-27T22:50:26Z 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. We here disentangle these signals using a unique 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 0.07 g kg-1 per decade, and decreasing it in subpolar surface waters by -0.028 g kg-1 per decade. In the subpolar region, this salinity decrease is countered by a salinity increase of 0.008 g kg-1 per decade from reduced sea ice melt, and enhanced by a salinity decrease of -0.005 g kg-1 per decade from increased glacial melt. These changes extend the growing evidence for an acceleration of the atmospheric water cycle and a melting cryosphere that can be expected from global warming. Article in Journal/Newspaper Sea ice Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Indian Southern Ocean |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
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. We here disentangle these signals using a unique 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 0.07 g kg-1 per decade, and decreasing it in subpolar surface waters by -0.028 g kg-1 per decade. In the subpolar region, this salinity decrease is countered by a salinity increase of 0.008 g kg-1 per decade from reduced sea ice melt, and enhanced by a salinity decrease of -0.005 g kg-1 per decade from increased glacial melt. These changes extend the growing evidence for an acceleration of the atmospheric water cycle and a melting cryosphere that can be expected from global warming. |
format |
Article in Journal/Newspaper |
author |
Hayatte Akhoudas, Camille Sallée, Jean-baptiste Reverdin, Gilles Haumann, Alexander F. Pauthenet, Etienne Chapman, Christopher Margirier, Félix Lo Monaco, Claire Metzl, Nicolas Meilland, Julie Stranne, Christian |
spellingShingle |
Hayatte Akhoudas, Camille Sallée, Jean-baptiste Reverdin, Gilles Haumann, Alexander F. Pauthenet, Etienne Chapman, Christopher 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 |
author_facet |
Hayatte Akhoudas, Camille Sallée, Jean-baptiste Reverdin, Gilles Haumann, Alexander F. Pauthenet, Etienne Chapman, Christopher Margirier, Félix Lo Monaco, Claire Metzl, Nicolas Meilland, Julie Stranne, Christian |
author_sort |
Hayatte Akhoudas, Camille |
title |
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_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_sort |
isotopic evidence for an intensified hydrological cycle in the indian sector of the southern ocean |
publisher |
Research Square Platform LLC |
publishDate |
2022 |
url |
https://archimer.ifremer.fr/doc/00789/90144/95727.pdf https://archimer.ifremer.fr/doc/00789/90144/95728.pdf https://doi.org/10.21203/rs.3.rs-1952513/v1 https://archimer.ifremer.fr/doc/00789/90144/ |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
Under review Natureportfolio (Research Square Platform LLC) In Press |
op_relation |
https://archimer.ifremer.fr/doc/00789/90144/95727.pdf https://archimer.ifremer.fr/doc/00789/90144/95728.pdf doi:10.21203/rs.3.rs-1952513/v1 https://archimer.ifremer.fr/doc/00789/90144/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.21203/rs.3.rs-1952513/v1 |
_version_ |
1766192938509926400 |