Observed mechanisms activating the recent subpolar North Atlantic Warming since 2016
The overturning circulation of the subpolar North Atlantic (SPNA) plays a fundamental role in Earth’s climate variability and change. Here, we show from observations that the recent warming period since about 2016 in the eastern SPNA involves increased western boundary density at the intergyre bound...
Published in: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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crroyalsociety:10.1098/rsta.2022.0183 2024-06-02T08:10:53+00:00 Observed mechanisms activating the recent subpolar North Atlantic Warming since 2016 Chafik, Léon Penny Holliday, N. Bacon, Sheldon Baker, Jonathan A. Desbruyères, Damien Frajka-Williams, Eleanor Jackson, Laura C. National Centre for Earth Observation HORIZON EUROPE Framework Programme Swedish National Space Agency Natural Environment Research Council Agence Nationale de la Recherche 2023 http://dx.doi.org/10.1098/rsta.2022.0183 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2022.0183 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2022.0183 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 381, issue 2262 ISSN 1364-503X 1471-2962 journal-article 2023 crroyalsociety https://doi.org/10.1098/rsta.2022.0183 2024-05-07T14:16:48Z The overturning circulation of the subpolar North Atlantic (SPNA) plays a fundamental role in Earth’s climate variability and change. Here, we show from observations that the recent warming period since about 2016 in the eastern SPNA involves increased western boundary density at the intergyre boundary, likely due to enhanced buoyancy forcing as a response to the strong increase in the North Atlantic Oscillation since the early 2010s. As these deep positive density anomalies spread southward along the western boundary, they enhance the North Atlantic Current and associated meridional heat transport at the intergyre region, leading to increased influx of subtropical heat into the eastern SPNA. Based on the timing of this chain of events, we conclude that this recent warming phase since about 2016 is primarily associated with this observed mechanism of changes in deep western boundary density, an essential element in these interactions. This article is part of a discussion meeting issue ‘Atlantic overturning: new observations and challenges’. Article in Journal/Newspaper north atlantic current North Atlantic North Atlantic oscillation The Royal Society Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 381 2262 |
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Open Polar |
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The Royal Society |
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crroyalsociety |
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English |
description |
The overturning circulation of the subpolar North Atlantic (SPNA) plays a fundamental role in Earth’s climate variability and change. Here, we show from observations that the recent warming period since about 2016 in the eastern SPNA involves increased western boundary density at the intergyre boundary, likely due to enhanced buoyancy forcing as a response to the strong increase in the North Atlantic Oscillation since the early 2010s. As these deep positive density anomalies spread southward along the western boundary, they enhance the North Atlantic Current and associated meridional heat transport at the intergyre region, leading to increased influx of subtropical heat into the eastern SPNA. Based on the timing of this chain of events, we conclude that this recent warming phase since about 2016 is primarily associated with this observed mechanism of changes in deep western boundary density, an essential element in these interactions. This article is part of a discussion meeting issue ‘Atlantic overturning: new observations and challenges’. |
author2 |
National Centre for Earth Observation HORIZON EUROPE Framework Programme Swedish National Space Agency Natural Environment Research Council Agence Nationale de la Recherche |
format |
Article in Journal/Newspaper |
author |
Chafik, Léon Penny Holliday, N. Bacon, Sheldon Baker, Jonathan A. Desbruyères, Damien Frajka-Williams, Eleanor Jackson, Laura C. |
spellingShingle |
Chafik, Léon Penny Holliday, N. Bacon, Sheldon Baker, Jonathan A. Desbruyères, Damien Frajka-Williams, Eleanor Jackson, Laura C. Observed mechanisms activating the recent subpolar North Atlantic Warming since 2016 |
author_facet |
Chafik, Léon Penny Holliday, N. Bacon, Sheldon Baker, Jonathan A. Desbruyères, Damien Frajka-Williams, Eleanor Jackson, Laura C. |
author_sort |
Chafik, Léon |
title |
Observed mechanisms activating the recent subpolar North Atlantic Warming since 2016 |
title_short |
Observed mechanisms activating the recent subpolar North Atlantic Warming since 2016 |
title_full |
Observed mechanisms activating the recent subpolar North Atlantic Warming since 2016 |
title_fullStr |
Observed mechanisms activating the recent subpolar North Atlantic Warming since 2016 |
title_full_unstemmed |
Observed mechanisms activating the recent subpolar North Atlantic Warming since 2016 |
title_sort |
observed mechanisms activating the recent subpolar north atlantic warming since 2016 |
publisher |
The Royal Society |
publishDate |
2023 |
url |
http://dx.doi.org/10.1098/rsta.2022.0183 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2022.0183 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsta.2022.0183 |
genre |
north atlantic current North Atlantic North Atlantic oscillation |
genre_facet |
north atlantic current North Atlantic North Atlantic oscillation |
op_source |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences volume 381, issue 2262 ISSN 1364-503X 1471-2962 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rsta.2022.0183 |
container_title |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
381 |
container_issue |
2262 |
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1800756810384146432 |