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Air-sea fluxes based on observed annual cycle surface climatology and ocean model internal dynamics: a precise, non-damping zero-phase-lag approach applied to the Mediterranean Sea

Air-sea fluxes based on observed annual cycle surface climatology and ocean model internal dynamics: a precise, non-damping zero-phase-lag approach applied to the Mediterranean Sea
Air-sea fluxes based on observed annual cycle surface climatology and ocean model internal dynamics: a precise, non-damping zero-phase-lag approach applied to the Mediterranean Sea
A new model-based method of determining the surface fluxes of heat and freshwater that are needed to force ocean models is presented. In contrast to deriving the fluxes from a simulation with a restoring surface boundary condition, the new method determines the fluxes as a residual within the framework of physically realistic and natural boundary conditions on the sea surface temperature (SST) and sea surface salinity (SSS). The fluxes are computed (diagnosed) in such a way that an ensemble average of the model-simulated annual cycles of SST and SSS match the observed climatological annual cycles of SST and SSS, respectively. The surface boundary condition on the SST implicitly includes a net radiative flux (diagnosed) and a physically realistic heat exchange with the atmosphere (restoring flux), while the boundary condition on the SSS is the real freshwater flux (diagnosed) as proposed by Huang (J. Phys. Oceanogr., 33 (1993) 2428). Apart from being based on physically realistic surface boundary conditions, the advantage of the method is that it results in a realistic model simulation of the observed annual cycle of SST and SSS with no artificial damping of surface watermass fronts. The resulting heat fluxes and freshwater sources are realistic if the observed climatological data and model internal physics are accurate. The performance of the method is demonstrated using the DieCAST ocean model adapted to the Mediterranean Sea where the obtained model fluxes are compared with observations.
Ocean modeling, surface buoyancy fluxes, Mediterranean Sea
0924-7963
145-165
Dietrich, D.E.
1b28efb2-9b2f-4514-b113-b59f74b5b5c3
Haney, R.L.
fc1ae21c-534b-405e-8216-c8028ac4b9c4
Fernandez, V.
eee262a8-0ec7-4866-98a7-fe8597314fe5
Josey, S.A.
2252ab7f-5cd2-49fd-a951-aece44553d93
Tintore, J.
dc80d290-ed84-42fe-b5a8-b4531a138c53
Dietrich, D.E.
1b28efb2-9b2f-4514-b113-b59f74b5b5c3
Haney, R.L.
fc1ae21c-534b-405e-8216-c8028ac4b9c4
Fernandez, V.
eee262a8-0ec7-4866-98a7-fe8597314fe5
Josey, S.A.
2252ab7f-5cd2-49fd-a951-aece44553d93
Tintore, J.
dc80d290-ed84-42fe-b5a8-b4531a138c53

Dietrich, D.E., Haney, R.L., Fernandez, V., Josey, S.A. and Tintore, J. (2004) Air-sea fluxes based on observed annual cycle surface climatology and ocean model internal dynamics: a precise, non-damping zero-phase-lag approach applied to the Mediterranean Sea. Journal of Marine Systems, 52 (1-4), 145-165. (doi:10.1016/j.jmarsys.2004.01.006).

Record type: Article

Abstract

A new model-based method of determining the surface fluxes of heat and freshwater that are needed to force ocean models is presented. In contrast to deriving the fluxes from a simulation with a restoring surface boundary condition, the new method determines the fluxes as a residual within the framework of physically realistic and natural boundary conditions on the sea surface temperature (SST) and sea surface salinity (SSS). The fluxes are computed (diagnosed) in such a way that an ensemble average of the model-simulated annual cycles of SST and SSS match the observed climatological annual cycles of SST and SSS, respectively. The surface boundary condition on the SST implicitly includes a net radiative flux (diagnosed) and a physically realistic heat exchange with the atmosphere (restoring flux), while the boundary condition on the SSS is the real freshwater flux (diagnosed) as proposed by Huang (J. Phys. Oceanogr., 33 (1993) 2428). Apart from being based on physically realistic surface boundary conditions, the advantage of the method is that it results in a realistic model simulation of the observed annual cycle of SST and SSS with no artificial damping of surface watermass fronts. The resulting heat fluxes and freshwater sources are realistic if the observed climatological data and model internal physics are accurate. The performance of the method is demonstrated using the DieCAST ocean model adapted to the Mediterranean Sea where the obtained model fluxes are compared with observations.

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Published date: 2004
Keywords: Ocean modeling, surface buoyancy fluxes, Mediterranean Sea

Identifiers

Local EPrints ID: 14894
URI: https://eprints.soton.ac.uk/id/eprint/14894
ISSN: 0924-7963
PURE UUID: 18b0b94b-6069-4777-a957-87531bfac3d5

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Date deposited: 17 Mar 2005
Last modified: 15 Jul 2019 19:32

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Contributors

Author: D.E. Dietrich
Author: R.L. Haney
Author: V. Fernandez
Author: S.A. Josey
Author: J. Tintore

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