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Southern Ocean response to relative velocity wind stress forcing

Southern Ocean response to relative velocity wind stress forcing
Southern Ocean response to relative velocity wind stress forcing
An eddy-resolving quasigeostrophic model of the Southern Ocean coupled to a dynamic atmospheric mixed layer is used to compare the performance of two different wind stress parameterization schemes. The first is the standard quadratic drag law, based on atmospheric velocity alone, whereas the second (more exact) formulation is based on the difference between ocean and atmosphere velocities. The two different schemes give very similar magnitudes of mean stress; however, the relative velocity scheme has substantially lower power input, resulting in a weaker eddy field, and consequently, greater circumpolar transport. These results are explored in terms of the existing theories of the Antarctic Circumpolar Current (including eddy saturation and eddy damping) and the implications for modeling the Southern Ocean are discussed.
0022-3670
326-339
Hutchinson, David K.
9db108b8-88f0-4c3a-a61b-0af71ab97501
Hogg, Andrew McC.
b7d9aa01-9dae-4cfa-ab16-6a1ded2d6575
Blundell, Jeffrey R.
88114f32-6b76-46b2-b2d8-d6ef64a82b0d
Hutchinson, David K.
9db108b8-88f0-4c3a-a61b-0af71ab97501
Hogg, Andrew McC.
b7d9aa01-9dae-4cfa-ab16-6a1ded2d6575
Blundell, Jeffrey R.
88114f32-6b76-46b2-b2d8-d6ef64a82b0d

Hutchinson, David K., Hogg, Andrew McC. and Blundell, Jeffrey R. (2010) Southern Ocean response to relative velocity wind stress forcing. Journal of Physical Oceanography, 40 (2), 326-339. (doi:10.1175/2009JPO4240.1).

Record type: Article

Abstract

An eddy-resolving quasigeostrophic model of the Southern Ocean coupled to a dynamic atmospheric mixed layer is used to compare the performance of two different wind stress parameterization schemes. The first is the standard quadratic drag law, based on atmospheric velocity alone, whereas the second (more exact) formulation is based on the difference between ocean and atmosphere velocities. The two different schemes give very similar magnitudes of mean stress; however, the relative velocity scheme has substantially lower power input, resulting in a weaker eddy field, and consequently, greater circumpolar transport. These results are explored in terms of the existing theories of the Antarctic Circumpolar Current (including eddy saturation and eddy damping) and the implications for modeling the Southern Ocean are discussed.

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Published date: February 2010
Organisations: Marine Systems Modelling

Identifiers

Local EPrints ID: 73158
URI: http://eprints.soton.ac.uk/id/eprint/73158
ISSN: 0022-3670
PURE UUID: 8cc5afab-3fa7-42c8-b5b6-d47aba19ba6f

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Date deposited: 02 Mar 2010
Last modified: 13 Mar 2024 21:55

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Contributors

Author: David K. Hutchinson
Author: Andrew McC. Hogg

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