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| Titel |
Formulation of an ocean model for global climate simulations |
| VerfasserIn |
S. M. Griffies, A. Gnanadesikan, K. W. Dixon, J. P. Dunne, R. Gerdes, M. J. Harrison, A. Rosati, J. L. Russell, B. L. Samuels, M. J. Spelman, M. Winton, R. Zhang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 1, no. 1 ; Nr. 1, no. 1 (2005-09-12), S.45-79 |
| Datensatznummer |
250000100
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| Publikation (Nr.) |
 copernicus.org/os-1-45-2005.pdf |
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| Zusammenfassung |
| This paper summarizes the formulation of the ocean component to the
Geophysical Fluid Dynamics Laboratory's (GFDL) climate model used for
the 4th IPCC Assessment (AR4) of global climate change. In
particular, it reviews the numerical schemes and physical
parameterizations that make up an ocean climate model and how these
schemes are pieced together for use in a state-of-the-art climate
model. Features of the model described here include the following:
(1) tripolar grid to resolve the Arctic Ocean without polar filtering,
(2) partial bottom step representation of topography to better
represent topographically influenced advective and wave processes, (3)
more accurate equation of state, (4) three-dimensional flux limited
tracer advection to reduce overshoots and undershoots, (5)
incorporation of regional climatological variability in shortwave
penetration, (6) neutral physics parameterization for representation
of the pathways of tracer transport, (7) staggered time stepping for
tracer conservation and numerical efficiency, (8) anisotropic
horizontal viscosities for representation of equatorial currents, (9)
parameterization of exchange with marginal seas, (10) incorporation of
a free surface that accomodates a dynamic ice model and wave
propagation, (11) transport of water across the ocean free surface to
eliminate unphysical ``virtual tracer flux" methods, (12)
parameterization of tidal mixing on continental shelves. We also
present preliminary analyses of two particularly important
sensitivities isolated during the development process, namely the
details of how parameterized subgridscale eddies transport momentum
and tracers. |
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