Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability
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...
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ftpubmed:oai:pubmedcentral.nih.gov:7819991 2023-05-15T13:47:52+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 2021-01-21 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7819991/ http://www.ncbi.nlm.nih.gov/pubmed/33479205 https://doi.org/10.1038/s41467-020-20781-1 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7819991/ http://www.ncbi.nlm.nih.gov/pubmed/33479205 http://dx.doi.org/10.1038/s41467-020-20781-1 © The Author(s) 2021 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/. CC-BY Nat Commun Article Text 2021 ftpubmed https://doi.org/10.1038/s41467-020-20781-1 2021-01-31T01:32:59Z 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. Text Antarc* Antarctic Ice Sheet Southern Ocean PubMed Central (PMC) Antarctic Southern Ocean Nature Communications 12 1 |
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Article Auger, Matthis Morrow, Rosemary Kestenare, Elodie Sallée, Jean-Baptiste Cowley, Rebecca Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability |
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Article |
description |
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. |
format |
Text |
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 |
Nature Publishing Group UK |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7819991/ http://www.ncbi.nlm.nih.gov/pubmed/33479205 https://doi.org/10.1038/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 |
Nat Commun |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7819991/ http://www.ncbi.nlm.nih.gov/pubmed/33479205 http://dx.doi.org/10.1038/s41467-020-20781-1 |
op_rights |
© The Author(s) 2021 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/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41467-020-20781-1 |
container_title |
Nature Communications |
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12 |
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1 |
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