The role of eddies in the Southern Ocean temperature response to the Southern Annular Mode
The role of eddies in modulating the Southern Ocean response to the southern annular mode (SAM) is examined, using an ocean model run at multiple resolutions from coarse to eddy resolving. The high-resolution versions of the model show an increase in eddy kinetic energy that peaks 2-3 yr after a pos...
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American Meteorological Society
2009
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Online Access: | http://nora.nerc.ac.uk/id/eprint/11205/ http://journals.ametsoc.org/doi/abs/10.1175/2008JCLI2416.1 |
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ftnerc:oai:nora.nerc.ac.uk:11205 2023-05-15T18:24:50+02:00 The role of eddies in the Southern Ocean temperature response to the Southern Annular Mode Screen, James A. Gillett, Nathan P. Stevens, David P. Marshall, Gareth J. Roscoe, Howard K. 2009 http://nora.nerc.ac.uk/id/eprint/11205/ http://journals.ametsoc.org/doi/abs/10.1175/2008JCLI2416.1 unknown American Meteorological Society Screen, James A.; Gillett, Nathan P.; Stevens, David P.; Marshall, Gareth J. orcid:0000-0001-8887-7314 Roscoe, Howard K. 2009 The role of eddies in the Southern Ocean temperature response to the Southern Annular Mode. Journal of Climate, 22 (3). 806-818. https://doi.org/10.1175/2008JCLI2416.1 <https://doi.org/10.1175/2008JCLI2416.1> Marine Sciences Meteorology and Climatology Earth Sciences Atmospheric Sciences Publication - Article PeerReviewed 2009 ftnerc https://doi.org/10.1175/2008JCLI2416.1 2023-02-04T19:27:12Z The role of eddies in modulating the Southern Ocean response to the southern annular mode (SAM) is examined, using an ocean model run at multiple resolutions from coarse to eddy resolving. The high-resolution versions of the model show an increase in eddy kinetic energy that peaks 2-3 yr after a positive anomaly in the SAM index. Previous work has shown that the instantaneous temperature response to the SAM is characterized by predominant cooling south of 45 degrees S and warming to the north. At all resolutions the model captures this temperature response. This response is also evident in the coarse-resolution implementation of the model with no eddy mixing parameterization, showing that eddies do not play an important role in the instantaneous response. On the longer time scales, an intensification of the mesoscale eddy field occurs, which causes enhanced poleward heat flux and drives warming south of the oceanic Polar Front. This warming is of greater magnitude and occurs for a longer period than the initial cooling response. The results demonstrate that this warming is surface intensified and strongest in the mixed layer. Non-eddy-resolving models are unable to capture the delayed eddy-driven temperature response to the SAM. The authors therefore question the ability of coarse-resolution models, such as those commonly used in climate simulations, to accurately represent the full impacts of the SAM on the Southern Ocean. Article in Journal/Newspaper Southern Ocean Natural Environment Research Council: NERC Open Research Archive Southern Ocean Journal of Climate 22 3 806 818 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Meteorology and Climatology Earth Sciences Atmospheric Sciences |
spellingShingle |
Marine Sciences Meteorology and Climatology Earth Sciences Atmospheric Sciences Screen, James A. Gillett, Nathan P. Stevens, David P. Marshall, Gareth J. Roscoe, Howard K. The role of eddies in the Southern Ocean temperature response to the Southern Annular Mode |
topic_facet |
Marine Sciences Meteorology and Climatology Earth Sciences Atmospheric Sciences |
description |
The role of eddies in modulating the Southern Ocean response to the southern annular mode (SAM) is examined, using an ocean model run at multiple resolutions from coarse to eddy resolving. The high-resolution versions of the model show an increase in eddy kinetic energy that peaks 2-3 yr after a positive anomaly in the SAM index. Previous work has shown that the instantaneous temperature response to the SAM is characterized by predominant cooling south of 45 degrees S and warming to the north. At all resolutions the model captures this temperature response. This response is also evident in the coarse-resolution implementation of the model with no eddy mixing parameterization, showing that eddies do not play an important role in the instantaneous response. On the longer time scales, an intensification of the mesoscale eddy field occurs, which causes enhanced poleward heat flux and drives warming south of the oceanic Polar Front. This warming is of greater magnitude and occurs for a longer period than the initial cooling response. The results demonstrate that this warming is surface intensified and strongest in the mixed layer. Non-eddy-resolving models are unable to capture the delayed eddy-driven temperature response to the SAM. The authors therefore question the ability of coarse-resolution models, such as those commonly used in climate simulations, to accurately represent the full impacts of the SAM on the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Screen, James A. Gillett, Nathan P. Stevens, David P. Marshall, Gareth J. Roscoe, Howard K. |
author_facet |
Screen, James A. Gillett, Nathan P. Stevens, David P. Marshall, Gareth J. Roscoe, Howard K. |
author_sort |
Screen, James A. |
title |
The role of eddies in the Southern Ocean temperature response to the Southern Annular Mode |
title_short |
The role of eddies in the Southern Ocean temperature response to the Southern Annular Mode |
title_full |
The role of eddies in the Southern Ocean temperature response to the Southern Annular Mode |
title_fullStr |
The role of eddies in the Southern Ocean temperature response to the Southern Annular Mode |
title_full_unstemmed |
The role of eddies in the Southern Ocean temperature response to the Southern Annular Mode |
title_sort |
role of eddies in the southern ocean temperature response to the southern annular mode |
publisher |
American Meteorological Society |
publishDate |
2009 |
url |
http://nora.nerc.ac.uk/id/eprint/11205/ http://journals.ametsoc.org/doi/abs/10.1175/2008JCLI2416.1 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Screen, James A.; Gillett, Nathan P.; Stevens, David P.; Marshall, Gareth J. orcid:0000-0001-8887-7314 Roscoe, Howard K. 2009 The role of eddies in the Southern Ocean temperature response to the Southern Annular Mode. Journal of Climate, 22 (3). 806-818. https://doi.org/10.1175/2008JCLI2416.1 <https://doi.org/10.1175/2008JCLI2416.1> |
op_doi |
https://doi.org/10.1175/2008JCLI2416.1 |
container_title |
Journal of Climate |
container_volume |
22 |
container_issue |
3 |
container_start_page |
806 |
op_container_end_page |
818 |
_version_ |
1766205792629817344 |