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Global tidal residual mean circulation: does it affect a climate OGCM?

Global tidal residual mean circulation: does it affect a climate OGCM?
Global tidal residual mean circulation: does it affect a climate OGCM?
A global description of the ocean tidal residual mean circulation (TRMC) is provided and its effect on a global ocean climate model is evaluated. The TRMC is computed from a global barotropic tidal model based on pure hydrodynamical equations and forced by the major tidal constituents. It thus includes both Stokes drift and non-linear tidal dynamics. The TRMC map exhibits remarkable basin scale structures in the Indonesian archipelago-Australian region and on the Malvinas shelf. Regions of largest transport are characterized by sites of high tidal amplitudes, abrupt topography and western boundaries. Yet transport magnitudes remain at a few tenths of a Sverdrup. This TRMC is introduced as an external forcing in an ocean climate model. At equilibrium, the thermohaline structure and the poleward heat transport of the ocean are almost insensitive to the TRMC. It is concluded that the TRMC is negligible for climate purposes in an ocean climate model.
tidal residual circulation, baratropic stream function, climate OGCM
0094-8276
L03609
Bessières, Laurent
0062fc16-9a9a-4e51-aee0-49282404b8e9
Madec, Gurvan
ffb28deb-4bbd-4a4c-914f-492f813e4864
Lyard, Florent
2f332ab7-d361-4c9e-a9a6-489c14c9eac1
Bessières, Laurent
0062fc16-9a9a-4e51-aee0-49282404b8e9
Madec, Gurvan
ffb28deb-4bbd-4a4c-914f-492f813e4864
Lyard, Florent
2f332ab7-d361-4c9e-a9a6-489c14c9eac1

Bessières, Laurent, Madec, Gurvan and Lyard, Florent (2008) Global tidal residual mean circulation: does it affect a climate OGCM? Geophysical Research Letters, 35, L03609. (doi:10.1029/2007GL032644).

Record type: Article

Abstract

A global description of the ocean tidal residual mean circulation (TRMC) is provided and its effect on a global ocean climate model is evaluated. The TRMC is computed from a global barotropic tidal model based on pure hydrodynamical equations and forced by the major tidal constituents. It thus includes both Stokes drift and non-linear tidal dynamics. The TRMC map exhibits remarkable basin scale structures in the Indonesian archipelago-Australian region and on the Malvinas shelf. Regions of largest transport are characterized by sites of high tidal amplitudes, abrupt topography and western boundaries. Yet transport magnitudes remain at a few tenths of a Sverdrup. This TRMC is introduced as an external forcing in an ocean climate model. At equilibrium, the thermohaline structure and the poleward heat transport of the ocean are almost insensitive to the TRMC. It is concluded that the TRMC is negligible for climate purposes in an ocean climate model.

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More information

Published date: 2008
Keywords: tidal residual circulation, baratropic stream function, climate OGCM
Organisations: National Oceanography Centre,Southampton

Identifiers

Local EPrints ID: 64323
URI: https://eprints.soton.ac.uk/id/eprint/64323
ISSN: 0094-8276
PURE UUID: 1eb65ec6-b08e-48f2-b8c7-1894304da52a

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Date deposited: 09 Dec 2008
Last modified: 13 Mar 2019 20:22

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Contributors

Author: Laurent Bessières
Author: Gurvan Madec
Author: Florent Lyard

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