Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter
The modulation of the winter impacts of Arctic sea-ice loss by the Pacific Decadal Oscillation (PDO) is investigated in the IPSL-CM6A-LR ocean–atmosphere general circulation model. Ensembles of simulations are performed with constrained sea-ice concentration following the Polar Amplification Model I...
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ftdoajarticles:oai:doaj.org/article:edff74405f34461691f84a6d7c661011 2023-05-15T13:15:05+02:00 Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter A. Simon G. Gastineau C. Frankignoul V. Lapin P. Ortega 2022-08-01T00:00:00Z https://doi.org/10.5194/wcd-3-845-2022 https://doaj.org/article/edff74405f34461691f84a6d7c661011 EN eng Copernicus Publications https://wcd.copernicus.org/articles/3/845/2022/wcd-3-845-2022.pdf https://doaj.org/toc/2698-4016 doi:10.5194/wcd-3-845-2022 2698-4016 https://doaj.org/article/edff74405f34461691f84a6d7c661011 Weather and Climate Dynamics, Vol 3, Pp 845-861 (2022) Meteorology. Climatology QC851-999 article 2022 ftdoajarticles https://doi.org/10.5194/wcd-3-845-2022 2022-12-30T22:45:28Z The modulation of the winter impacts of Arctic sea-ice loss by the Pacific Decadal Oscillation (PDO) is investigated in the IPSL-CM6A-LR ocean–atmosphere general circulation model. Ensembles of simulations are performed with constrained sea-ice concentration following the Polar Amplification Model Intercomparison Project (PAMIP) and initial conditions sampling warm and cold phases of the PDO. Using a general linear model, we estimate the simulated winter impact of sea-ice loss, PDO and their combined effects. On the one hand, a negative North Atlantic Oscillation (NAO)-like pattern appears in response to sea-ice loss together with a modest deepening of the Aleutian Low. On the other hand, a warm PDO phase induces a large positive Pacific–North America pattern, as well as a small negative Arctic Oscillation pattern. Both sea-ice loss and warm PDO responses are associated with a weakening of the poleward flank of the eddy-driven jet, an intensification of the subtropical jet and a weakening of the stratospheric polar vortex. These effects are partly additive; the warm PDO phase therefore enhances the response to sea-ice loss, while the cold PDO phase reduces it. However, the effects of PDO and sea-ice loss are also partly non-additive, with the interaction between both signals being slightly destructive. This results in small damping of the PDO teleconnections under sea-ice loss conditions, especially in the stratosphere. The sea-ice loss responses are compared to those obtained with the same model in atmosphere-only simulations, where sea-ice loss does not significantly alter the stratospheric polar vortex. Article in Journal/Newspaper aleutian low Arctic North Atlantic North Atlantic oscillation Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Pacific Weather and Climate Dynamics 3 3 845 861 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Meteorology. Climatology QC851-999 |
spellingShingle |
Meteorology. Climatology QC851-999 A. Simon G. Gastineau C. Frankignoul V. Lapin P. Ortega Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter |
topic_facet |
Meteorology. Climatology QC851-999 |
description |
The modulation of the winter impacts of Arctic sea-ice loss by the Pacific Decadal Oscillation (PDO) is investigated in the IPSL-CM6A-LR ocean–atmosphere general circulation model. Ensembles of simulations are performed with constrained sea-ice concentration following the Polar Amplification Model Intercomparison Project (PAMIP) and initial conditions sampling warm and cold phases of the PDO. Using a general linear model, we estimate the simulated winter impact of sea-ice loss, PDO and their combined effects. On the one hand, a negative North Atlantic Oscillation (NAO)-like pattern appears in response to sea-ice loss together with a modest deepening of the Aleutian Low. On the other hand, a warm PDO phase induces a large positive Pacific–North America pattern, as well as a small negative Arctic Oscillation pattern. Both sea-ice loss and warm PDO responses are associated with a weakening of the poleward flank of the eddy-driven jet, an intensification of the subtropical jet and a weakening of the stratospheric polar vortex. These effects are partly additive; the warm PDO phase therefore enhances the response to sea-ice loss, while the cold PDO phase reduces it. However, the effects of PDO and sea-ice loss are also partly non-additive, with the interaction between both signals being slightly destructive. This results in small damping of the PDO teleconnections under sea-ice loss conditions, especially in the stratosphere. The sea-ice loss responses are compared to those obtained with the same model in atmosphere-only simulations, where sea-ice loss does not significantly alter the stratospheric polar vortex. |
format |
Article in Journal/Newspaper |
author |
A. Simon G. Gastineau C. Frankignoul V. Lapin P. Ortega |
author_facet |
A. Simon G. Gastineau C. Frankignoul V. Lapin P. Ortega |
author_sort |
A. Simon |
title |
Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter |
title_short |
Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter |
title_full |
Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter |
title_fullStr |
Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter |
title_full_unstemmed |
Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter |
title_sort |
pacific decadal oscillation modulates the arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/wcd-3-845-2022 https://doaj.org/article/edff74405f34461691f84a6d7c661011 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
aleutian low Arctic North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
aleutian low Arctic North Atlantic North Atlantic oscillation Sea ice |
op_source |
Weather and Climate Dynamics, Vol 3, Pp 845-861 (2022) |
op_relation |
https://wcd.copernicus.org/articles/3/845/2022/wcd-3-845-2022.pdf https://doaj.org/toc/2698-4016 doi:10.5194/wcd-3-845-2022 2698-4016 https://doaj.org/article/edff74405f34461691f84a6d7c661011 |
op_doi |
https://doi.org/10.5194/wcd-3-845-2022 |
container_title |
Weather and Climate Dynamics |
container_volume |
3 |
container_issue |
3 |
container_start_page |
845 |
op_container_end_page |
861 |
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1766266846061789184 |