Impact of Labrador sea‐ice extent on the North Atlantic oscillation
Abstract The wintertime atmospheric response to imposed sea‐surface temperature and sea‐ice extent changes in the Labrador Sea has been investigated by means of ensemble simulations with an atmospheric general circulation model. Low temperatures and heavy ice conditions in the Labrador Sea produce a...
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crwiley:10.1002/joc.1015 2024-09-15T18:17:11+00:00 Impact of Labrador sea‐ice extent on the North Atlantic oscillation Kvamstø, Nils Gunnar Skeie, Paul Stephenson, David B. 2004 http://dx.doi.org/10.1002/joc.1015 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.1015 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.1015 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 24, issue 5, page 603-612 ISSN 0899-8418 1097-0088 journal-article 2004 crwiley https://doi.org/10.1002/joc.1015 2024-08-27T04:30:52Z Abstract The wintertime atmospheric response to imposed sea‐surface temperature and sea‐ice extent changes in the Labrador Sea has been investigated by means of ensemble simulations with an atmospheric general circulation model. Low temperatures and heavy ice conditions in the Labrador Sea produce a statistically significant (at 95% confidence) negative North Atlantic oscillation–Arctic oscillation (NAO–AO) response. Conversely, reduced sea‐ice extent in the Labrador Sea produces a positive NAO–AO response. The two simulations with opposite sea‐ice conditions in the Labrador Sea exhibit a maximum mean wintertime difference of 4–5 hPa in sea‐level pressure corresponding to a substantial and statistically significant change in the NAO–AO index of 0.7 standard deviations. The large‐scale response to a local perturbation of sea‐ice conditions is associated with marked changes in the transient eddies (synoptic storms). Changes in the sea‐ice cover cause changes in low‐level baroclinicity that perturb the travelling baroclinic disturbances, which then bring the signal downstream to manifest a non‐local Atlantic‐wide response. The atmospheric response suggests that the sea ice in the Labrador Sea is able to provide an important negative feedback on long‐term NAO–AO variations. Copyright © 2004 Royal Meteorological Society Article in Journal/Newspaper Labrador Sea North Atlantic North Atlantic oscillation Sea ice Wiley Online Library International Journal of Climatology 24 5 603 612 |
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English |
description |
Abstract The wintertime atmospheric response to imposed sea‐surface temperature and sea‐ice extent changes in the Labrador Sea has been investigated by means of ensemble simulations with an atmospheric general circulation model. Low temperatures and heavy ice conditions in the Labrador Sea produce a statistically significant (at 95% confidence) negative North Atlantic oscillation–Arctic oscillation (NAO–AO) response. Conversely, reduced sea‐ice extent in the Labrador Sea produces a positive NAO–AO response. The two simulations with opposite sea‐ice conditions in the Labrador Sea exhibit a maximum mean wintertime difference of 4–5 hPa in sea‐level pressure corresponding to a substantial and statistically significant change in the NAO–AO index of 0.7 standard deviations. The large‐scale response to a local perturbation of sea‐ice conditions is associated with marked changes in the transient eddies (synoptic storms). Changes in the sea‐ice cover cause changes in low‐level baroclinicity that perturb the travelling baroclinic disturbances, which then bring the signal downstream to manifest a non‐local Atlantic‐wide response. The atmospheric response suggests that the sea ice in the Labrador Sea is able to provide an important negative feedback on long‐term NAO–AO variations. Copyright © 2004 Royal Meteorological Society |
format |
Article in Journal/Newspaper |
author |
Kvamstø, Nils Gunnar Skeie, Paul Stephenson, David B. |
spellingShingle |
Kvamstø, Nils Gunnar Skeie, Paul Stephenson, David B. Impact of Labrador sea‐ice extent on the North Atlantic oscillation |
author_facet |
Kvamstø, Nils Gunnar Skeie, Paul Stephenson, David B. |
author_sort |
Kvamstø, Nils Gunnar |
title |
Impact of Labrador sea‐ice extent on the North Atlantic oscillation |
title_short |
Impact of Labrador sea‐ice extent on the North Atlantic oscillation |
title_full |
Impact of Labrador sea‐ice extent on the North Atlantic oscillation |
title_fullStr |
Impact of Labrador sea‐ice extent on the North Atlantic oscillation |
title_full_unstemmed |
Impact of Labrador sea‐ice extent on the North Atlantic oscillation |
title_sort |
impact of labrador sea‐ice extent on the north atlantic oscillation |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1002/joc.1015 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.1015 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.1015 |
genre |
Labrador Sea North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
Labrador Sea North Atlantic North Atlantic oscillation Sea ice |
op_source |
International Journal of Climatology volume 24, issue 5, page 603-612 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.1015 |
container_title |
International Journal of Climatology |
container_volume |
24 |
container_issue |
5 |
container_start_page |
603 |
op_container_end_page |
612 |
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1810455177324396544 |