North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study
The extratropical large-scale atmospheric circulation is often described in terms of a few preferred and recurrent patterns referred to as weather regimes. Here, we investigate the influence of the observed Indian and western Pacific Ocean (IP) warming over the last decades, on the frequency of occu...
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ftoceanrep:oai:oceanrep.geomar.de:7321 2023-05-15T16:29:19+02:00 North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study SanchezGomez, E. Cassou, C. Hodson, D. L. R. Keenlyside, Noel Okmura, Y. Zhou, T. 2008 text https://oceanrep.geomar.de/id/eprint/7321/ https://oceanrep.geomar.de/id/eprint/7321/1/SanchezGomez_et_al-2008-Geophysical_Research_Letters.pdf https://doi.org/10.1029/2008GL034345 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/7321/1/SanchezGomez_et_al-2008-Geophysical_Research_Letters.pdf SanchezGomez, E., Cassou, C., Hodson, D. L. R., Keenlyside, N., Okmura, Y. and Zhou, T. (2008) North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study. Open Access Geophysical Research Letters, 35 (15). L15706. DOI 10.1029/2008GL034345 <https://doi.org/10.1029/2008GL034345>. doi:10.1029/2008GL034345 info:eu-repo/semantics/openAccess Article PeerReviewed 2008 ftoceanrep https://doi.org/10.1029/2008GL034345 2023-04-07T14:54:32Z The extratropical large-scale atmospheric circulation is often described in terms of a few preferred and recurrent patterns referred to as weather regimes. Here, we investigate the influence of the observed Indian and western Pacific Ocean (IP) warming over the last decades, on the frequency of occurrence of North Atlantic weather regimes. A multi-model approach is adopted in which five different atmospheric general circulation models are forced with idealized sea surface temperature patterns mimicking the IP warming. Despite some discrepancies, three models suggest a stronger occurrence of the Zonal regime when IP is warm, compensated by less frequent Greenland Anticyclone regimes, consistently with the observed positive trend of the North Atlantic Oscillation. The other two models simulate instead an increase in the frequency of occurrence of the Atlantic Ridge regime. Variance decomposition into stationary and transient waves suggest two mechanisms at work in the individual models. The AR regime favoured occurrence is associated with a strong transient wave activity along the wave guide in the North Pacific and downstream in the North Atlantic. The Zonal favoured excitation is interpreted as an indirect response to changes in the Tropical Atlantic associated with a global alteration of the Walker cell. Article in Journal/Newspaper Greenland North Atlantic North Atlantic oscillation OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Greenland Indian Pacific Geophysical Research Letters 35 15 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
The extratropical large-scale atmospheric circulation is often described in terms of a few preferred and recurrent patterns referred to as weather regimes. Here, we investigate the influence of the observed Indian and western Pacific Ocean (IP) warming over the last decades, on the frequency of occurrence of North Atlantic weather regimes. A multi-model approach is adopted in which five different atmospheric general circulation models are forced with idealized sea surface temperature patterns mimicking the IP warming. Despite some discrepancies, three models suggest a stronger occurrence of the Zonal regime when IP is warm, compensated by less frequent Greenland Anticyclone regimes, consistently with the observed positive trend of the North Atlantic Oscillation. The other two models simulate instead an increase in the frequency of occurrence of the Atlantic Ridge regime. Variance decomposition into stationary and transient waves suggest two mechanisms at work in the individual models. The AR regime favoured occurrence is associated with a strong transient wave activity along the wave guide in the North Pacific and downstream in the North Atlantic. The Zonal favoured excitation is interpreted as an indirect response to changes in the Tropical Atlantic associated with a global alteration of the Walker cell. |
format |
Article in Journal/Newspaper |
author |
SanchezGomez, E. Cassou, C. Hodson, D. L. R. Keenlyside, Noel Okmura, Y. Zhou, T. |
spellingShingle |
SanchezGomez, E. Cassou, C. Hodson, D. L. R. Keenlyside, Noel Okmura, Y. Zhou, T. North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study |
author_facet |
SanchezGomez, E. Cassou, C. Hodson, D. L. R. Keenlyside, Noel Okmura, Y. Zhou, T. |
author_sort |
SanchezGomez, E. |
title |
North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study |
title_short |
North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study |
title_full |
North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study |
title_fullStr |
North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study |
title_full_unstemmed |
North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study |
title_sort |
north atlantic weather regimes response to indian-western pacific ocean warming: a multi-model study |
publisher |
AGU (American Geophysical Union) |
publishDate |
2008 |
url |
https://oceanrep.geomar.de/id/eprint/7321/ https://oceanrep.geomar.de/id/eprint/7321/1/SanchezGomez_et_al-2008-Geophysical_Research_Letters.pdf https://doi.org/10.1029/2008GL034345 |
geographic |
Greenland Indian Pacific |
geographic_facet |
Greenland Indian Pacific |
genre |
Greenland North Atlantic North Atlantic oscillation |
genre_facet |
Greenland North Atlantic North Atlantic oscillation |
op_relation |
https://oceanrep.geomar.de/id/eprint/7321/1/SanchezGomez_et_al-2008-Geophysical_Research_Letters.pdf SanchezGomez, E., Cassou, C., Hodson, D. L. R., Keenlyside, N., Okmura, Y. and Zhou, T. (2008) North Atlantic weather regimes response to Indian-western Pacific Ocean warming: A multi-model study. Open Access Geophysical Research Letters, 35 (15). L15706. DOI 10.1029/2008GL034345 <https://doi.org/10.1029/2008GL034345>. doi:10.1029/2008GL034345 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2008GL034345 |
container_title |
Geophysical Research Letters |
container_volume |
35 |
container_issue |
15 |
_version_ |
1766019010603778048 |