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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2009
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:24483 2023-06-06T11:59:31+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 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/24483/ https://ueaeprints.uea.ac.uk/id/eprint/24483/1/DS_47.pdf https://doi.org/10.1175/2008JCLI2416.1 en eng https://ueaeprints.uea.ac.uk/id/eprint/24483/1/DS_47.pdf Screen, James A., Gillett, Nathan P., Stevens, David P., Marshall, Gareth J. and Roscoe, Howard K. (2009) The role of eddies in the Southern Ocean temperature response to the southern annular mode. Journal of Climate, 22 (3). pp. 806-818. ISSN 1520-0442 doi:10.1175/2008JCLI2416.1 Article PeerReviewed 2009 ftuniveastangl https://doi.org/10.1175/2008JCLI2416.1 2023-04-13T22:31:25Z 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°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 University of East Anglia: UEA Digital Repository Southern Ocean Journal of Climate 22 3 806 818 |
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Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
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°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. |
spellingShingle |
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 |
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 |
publishDate |
2009 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/24483/ https://ueaeprints.uea.ac.uk/id/eprint/24483/1/DS_47.pdf https://doi.org/10.1175/2008JCLI2416.1 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/24483/1/DS_47.pdf Screen, James A., Gillett, Nathan P., Stevens, David P., Marshall, Gareth J. and Roscoe, Howard K. (2009) The role of eddies in the Southern Ocean temperature response to the southern annular mode. Journal of Climate, 22 (3). pp. 806-818. ISSN 1520-0442 doi: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 |
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1767949528739086336 |