Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability
Abstract Despite playing a major role in global ocean heat storage, the Southern Ocean remains the most sparsely measured region of the global ocean. Here, a unique 25-year temperature time-series of the upper 800 m, repeated several times a year across the Southern Ocean, allows us to document the...
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2021
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Online Access: | http://dx.doi.org/10.1038/s41467-020-20781-1 http://www.nature.com/articles/s41467-020-20781-1.pdf http://www.nature.com/articles/s41467-020-20781-1 |
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crspringernat:10.1038/s41467-020-20781-1 2023-05-15T14:09:40+02:00 Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability Auger, Matthis Morrow, Rosemary Kestenare, Elodie Sallée, Jean-Baptiste Cowley, Rebecca Centre National d'Etudes Spatiales Centre National de la Recherche Scientifique Centre National d'Etudes Spatiales 2021 http://dx.doi.org/10.1038/s41467-020-20781-1 http://www.nature.com/articles/s41467-020-20781-1.pdf http://www.nature.com/articles/s41467-020-20781-1 en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Nature Communications volume 12, issue 1 ISSN 2041-1723 General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry journal-article 2021 crspringernat https://doi.org/10.1038/s41467-020-20781-1 2022-01-04T16:52:01Z Abstract Despite playing a major role in global ocean heat storage, the Southern Ocean remains the most sparsely measured region of the global ocean. Here, a unique 25-year temperature time-series of the upper 800 m, repeated several times a year across the Southern Ocean, allows us to document the long-term change within water-masses and how it compares to the interannual variability. Three regions stand out as having strong trends that dominate over interannual variability: warming of the subantarctic waters (0.29 ± 0.09 °C per decade); cooling of the near-surface subpolar waters (−0.07 ± 0.04 °C per decade); and warming of the subsurface subpolar deep waters (0.04 ± 0.01 °C per decade). Although this subsurface warming of subpolar deep waters is small, it is the most robust long-term trend of our section, being in a region with weak interannual variability. This robust warming is associated with a large shoaling of the maximum temperature core in the subpolar deep water (39 ± 09 m per decade), which has been significantly underestimated by a factor of 3 to 10 in past studies. We find temperature changes of comparable magnitude to those reported in Amundsen–Bellingshausen Seas, which calls for a reconsideration of current ocean changes with important consequences for our understanding of future Antarctic ice-sheet mass loss. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Southern Ocean Springer Nature (via Crossref) Antarctic Southern Ocean Nature Communications 12 1 |
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Open Polar |
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Springer Nature (via Crossref) |
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language |
English |
topic |
General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry |
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General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry Auger, Matthis Morrow, Rosemary Kestenare, Elodie Sallée, Jean-Baptiste Cowley, Rebecca Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability |
topic_facet |
General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry |
description |
Abstract Despite playing a major role in global ocean heat storage, the Southern Ocean remains the most sparsely measured region of the global ocean. Here, a unique 25-year temperature time-series of the upper 800 m, repeated several times a year across the Southern Ocean, allows us to document the long-term change within water-masses and how it compares to the interannual variability. Three regions stand out as having strong trends that dominate over interannual variability: warming of the subantarctic waters (0.29 ± 0.09 °C per decade); cooling of the near-surface subpolar waters (−0.07 ± 0.04 °C per decade); and warming of the subsurface subpolar deep waters (0.04 ± 0.01 °C per decade). Although this subsurface warming of subpolar deep waters is small, it is the most robust long-term trend of our section, being in a region with weak interannual variability. This robust warming is associated with a large shoaling of the maximum temperature core in the subpolar deep water (39 ± 09 m per decade), which has been significantly underestimated by a factor of 3 to 10 in past studies. We find temperature changes of comparable magnitude to those reported in Amundsen–Bellingshausen Seas, which calls for a reconsideration of current ocean changes with important consequences for our understanding of future Antarctic ice-sheet mass loss. |
author2 |
Centre National d'Etudes Spatiales Centre National de la Recherche Scientifique Centre National d'Etudes Spatiales |
format |
Article in Journal/Newspaper |
author |
Auger, Matthis Morrow, Rosemary Kestenare, Elodie Sallée, Jean-Baptiste Cowley, Rebecca |
author_facet |
Auger, Matthis Morrow, Rosemary Kestenare, Elodie Sallée, Jean-Baptiste Cowley, Rebecca |
author_sort |
Auger, Matthis |
title |
Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability |
title_short |
Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability |
title_full |
Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability |
title_fullStr |
Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability |
title_full_unstemmed |
Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability |
title_sort |
southern ocean in-situ temperature trends over 25 years emerge from interannual variability |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1038/s41467-020-20781-1 http://www.nature.com/articles/s41467-020-20781-1.pdf http://www.nature.com/articles/s41467-020-20781-1 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Southern Ocean |
op_source |
Nature Communications volume 12, issue 1 ISSN 2041-1723 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41467-020-20781-1 |
container_title |
Nature Communications |
container_volume |
12 |
container_issue |
1 |
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1766281692430991360 |