Coupled stratosphere-troposphere-Atlantic multidecadal oscillation and its importance for near-future climate projection
Northern Hemisphere (NH) climate has experienced various coherent wintertime multidecadal climate trends in stratosphere, troposphere, ocean, and cryosphere. However, the overall mechanistic framework linking these trends is not well established. Here we show, using long-term transient forced couple...
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ftpubman:oai:pure.mpg.de:item_3396744 2023-08-27T04:07:23+02:00 Coupled stratosphere-troposphere-Atlantic multidecadal oscillation and its importance for near-future climate projection Omrani, N. Keenlyside, N. Matthes, K. Boljka, L. Zanchettin, D. Jungclaus, J. Lubis, S. 2022-07-11 application/pdf http://hdl.handle.net/21.11116/0000-000A-C692-1 http://hdl.handle.net/21.11116/0000-000A-C6A4-D eng eng info:eu-repo/semantics/altIdentifier/doi/10.1038/s41612-022-00275-1 http://hdl.handle.net/21.11116/0000-000A-C692-1 http://hdl.handle.net/21.11116/0000-000A-C6A4-D info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ npj Climate and Atmospheric Science info:eu-repo/semantics/article 2022 ftpubman https://doi.org/10.1038/s41612-022-00275-1 2023-08-02T01:45:08Z Northern Hemisphere (NH) climate has experienced various coherent wintertime multidecadal climate trends in stratosphere, troposphere, ocean, and cryosphere. However, the overall mechanistic framework linking these trends is not well established. Here we show, using long-term transient forced coupled climate simulation, that large parts of the coherent NH-multidecadal changes can be understood within a damped coupled stratosphere/troposphere/ocean-oscillation framework. Wave-induced downward propagating positive stratosphere/troposphere-coupled Northern Annular Mode (NAM) and associated stratospheric cooling initiate delayed thermohaline strengthening of Atlantic overturning circulation and extratropical Atlantic-gyres. These increase the poleward oceanic heat transport leading to Arctic sea-ice melting, Arctic warming amplification, and large-scale Atlantic warming, which in turn initiates wave-induced downward propagating negative NAM and stratospheric warming and therefore reverse the oscillation phase. This coupled variability improves the performance of statistical models, which project further weakening of North Atlantic Oscillation, North Atlantic cooling and hiatus in wintertime North Atlantic-Arctic sea-ice and global surface temperature just like the 1950s-1970s. Article in Journal/Newspaper Arctic Atlantic Arctic Atlantic-Arctic North Atlantic North Atlantic oscillation Sea ice Max Planck Society: MPG.PuRe Arctic npj Climate and Atmospheric Science 5 1 |
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Max Planck Society: MPG.PuRe |
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ftpubman |
language |
English |
description |
Northern Hemisphere (NH) climate has experienced various coherent wintertime multidecadal climate trends in stratosphere, troposphere, ocean, and cryosphere. However, the overall mechanistic framework linking these trends is not well established. Here we show, using long-term transient forced coupled climate simulation, that large parts of the coherent NH-multidecadal changes can be understood within a damped coupled stratosphere/troposphere/ocean-oscillation framework. Wave-induced downward propagating positive stratosphere/troposphere-coupled Northern Annular Mode (NAM) and associated stratospheric cooling initiate delayed thermohaline strengthening of Atlantic overturning circulation and extratropical Atlantic-gyres. These increase the poleward oceanic heat transport leading to Arctic sea-ice melting, Arctic warming amplification, and large-scale Atlantic warming, which in turn initiates wave-induced downward propagating negative NAM and stratospheric warming and therefore reverse the oscillation phase. This coupled variability improves the performance of statistical models, which project further weakening of North Atlantic Oscillation, North Atlantic cooling and hiatus in wintertime North Atlantic-Arctic sea-ice and global surface temperature just like the 1950s-1970s. |
format |
Article in Journal/Newspaper |
author |
Omrani, N. Keenlyside, N. Matthes, K. Boljka, L. Zanchettin, D. Jungclaus, J. Lubis, S. |
spellingShingle |
Omrani, N. Keenlyside, N. Matthes, K. Boljka, L. Zanchettin, D. Jungclaus, J. Lubis, S. Coupled stratosphere-troposphere-Atlantic multidecadal oscillation and its importance for near-future climate projection |
author_facet |
Omrani, N. Keenlyside, N. Matthes, K. Boljka, L. Zanchettin, D. Jungclaus, J. Lubis, S. |
author_sort |
Omrani, N. |
title |
Coupled stratosphere-troposphere-Atlantic multidecadal oscillation and its importance for near-future climate projection |
title_short |
Coupled stratosphere-troposphere-Atlantic multidecadal oscillation and its importance for near-future climate projection |
title_full |
Coupled stratosphere-troposphere-Atlantic multidecadal oscillation and its importance for near-future climate projection |
title_fullStr |
Coupled stratosphere-troposphere-Atlantic multidecadal oscillation and its importance for near-future climate projection |
title_full_unstemmed |
Coupled stratosphere-troposphere-Atlantic multidecadal oscillation and its importance for near-future climate projection |
title_sort |
coupled stratosphere-troposphere-atlantic multidecadal oscillation and its importance for near-future climate projection |
publishDate |
2022 |
url |
http://hdl.handle.net/21.11116/0000-000A-C692-1 http://hdl.handle.net/21.11116/0000-000A-C6A4-D |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Atlantic Arctic Atlantic-Arctic North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
Arctic Atlantic Arctic Atlantic-Arctic North Atlantic North Atlantic oscillation Sea ice |
op_source |
npj Climate and Atmospheric Science |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41612-022-00275-1 http://hdl.handle.net/21.11116/0000-000A-C692-1 http://hdl.handle.net/21.11116/0000-000A-C6A4-D |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1038/s41612-022-00275-1 |
container_title |
npj Climate and Atmospheric Science |
container_volume |
5 |
container_issue |
1 |
_version_ |
1775348164782456832 |