Wind Stress Parameterisation in the Southern Ocean
Wind stress is often parameterised in ocean-atmosphere coupled models by a quadratic function of atmosphere velocity. Strictly speaking, this drag law should be a quadratic function of the difference between the ocean and atmosphere velocities. The two schemes give very similar magnitudes of stress,...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/47691 2023-05-15T13:35:18+02:00 Wind Stress Parameterisation in the Southern Ocean Hutchinson, David Karel 2008-11-18T04:56:23Z http://hdl.handle.net/1885/47691 http://digitalcollections.anu.edu.au/handle/1885/47691 en eng http://hdl.handle.net/1885/47691 http://digitalcollections.anu.edu.au/handle/1885/47691 wind stress eddies Antarctic Circumpolar Current sea surface temperature temperature coupling velocity difference power input transport ocean atmosphere Thesis (Honours) 2008 ftanucanberra 2016-02-29T23:17:43Z Wind stress is often parameterised in ocean-atmosphere coupled models by a quadratic function of atmosphere velocity. Strictly speaking, this drag law should be a quadratic function of the difference between the ocean and atmosphere velocities. The two schemes give very similar magnitudes of stress, however the power input is significantly reduced under the velocity difference stress. This work is the first to model this effect in the Southern Ocean. The velocity difference stress is found to reduce power input, but paradoxically the circumpolar transport is increased. The increase in transport is a consequence of two main factors: eddy saturation of the Antarctic Circumpolar Current, and eddy damping under the velocity difference stress. ¶ The wind stress parameterisation is also modified, by coupling the quadratic drag law to the temperature difference between the ocean and atmosphere. This simple representation is shown to be consistent with scatterometer observations, and the coupling constant is calibrated using known correlations between gradients of stress and sea surface temperature. Unlike the velocity difference stress, the temperature coupled stress is found to have a negligible effect on the mean flow in this model. Other/Unknown Material Antarc* Antarctic Southern Ocean Australian National University: ANU Digital Collections Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
English |
topic |
wind stress eddies Antarctic Circumpolar Current sea surface temperature temperature coupling velocity difference power input transport ocean atmosphere |
spellingShingle |
wind stress eddies Antarctic Circumpolar Current sea surface temperature temperature coupling velocity difference power input transport ocean atmosphere Hutchinson, David Karel Wind Stress Parameterisation in the Southern Ocean |
topic_facet |
wind stress eddies Antarctic Circumpolar Current sea surface temperature temperature coupling velocity difference power input transport ocean atmosphere |
description |
Wind stress is often parameterised in ocean-atmosphere coupled models by a quadratic function of atmosphere velocity. Strictly speaking, this drag law should be a quadratic function of the difference between the ocean and atmosphere velocities. The two schemes give very similar magnitudes of stress, however the power input is significantly reduced under the velocity difference stress. This work is the first to model this effect in the Southern Ocean. The velocity difference stress is found to reduce power input, but paradoxically the circumpolar transport is increased. The increase in transport is a consequence of two main factors: eddy saturation of the Antarctic Circumpolar Current, and eddy damping under the velocity difference stress. ¶ The wind stress parameterisation is also modified, by coupling the quadratic drag law to the temperature difference between the ocean and atmosphere. This simple representation is shown to be consistent with scatterometer observations, and the coupling constant is calibrated using known correlations between gradients of stress and sea surface temperature. Unlike the velocity difference stress, the temperature coupled stress is found to have a negligible effect on the mean flow in this model. |
format |
Other/Unknown Material |
author |
Hutchinson, David Karel |
author_facet |
Hutchinson, David Karel |
author_sort |
Hutchinson, David Karel |
title |
Wind Stress Parameterisation in the Southern Ocean |
title_short |
Wind Stress Parameterisation in the Southern Ocean |
title_full |
Wind Stress Parameterisation in the Southern Ocean |
title_fullStr |
Wind Stress Parameterisation in the Southern Ocean |
title_full_unstemmed |
Wind Stress Parameterisation in the Southern Ocean |
title_sort |
wind stress parameterisation in the southern ocean |
publishDate |
2008 |
url |
http://hdl.handle.net/1885/47691 http://digitalcollections.anu.edu.au/handle/1885/47691 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
http://hdl.handle.net/1885/47691 http://digitalcollections.anu.edu.au/handle/1885/47691 |
_version_ |
1766064041203073024 |