Imperfections of the North Atlantic wind-driven ocean circulation: Continental geometry and windstress shape
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ID: 298708
1999
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Abstract
Multiple equilibria of the wind-driven gyres have been found in idealized quasi-
geostrophic and shallow water models.In this paper we demonstrate that multiple
equilibria persist within a reduced gravity shallow water model under quite realis-
tic continental geometry and windstress orcing for the North-Atlantic.Multiple
mean flow patterns of the Gulf Stream exist and differ with respect to their separation behavior along the North-American coast.The origin of these equilibria
is investigated by determining the structure of steady solutions within a hierarchy of equivalent barotropic ocean models using continuation techniques.Within
each model,the magnitude of lateral riction is used as a control parameter.It is
shown that symmetry breaking, found in a quasi-geostrophic model for a rectan-
gular ocean basin with idealized wind forcing is at the origin of two different mean
states of the Gul Stream.The steady states ound become unstable only to a
small number of oscillatory modes,which either have intermonthly or interannual
periods.The modes of variability remain strongly related through the hierarchy
of models indicating that their physics is not strongly dependent on the shape of
the continents but is controlled by internal ocean dynamics.
| Reference Key |
openalex_W1976091340
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|---|---|
| Authors | Henk A. Dijkstra, M. Jeroen Molemaker |
| Journal | journal of marine research |
| Year | 1999 |
| DOI |
10.1357/002224099765038544
|
| URL | |
| Keywords | Keywords not found |
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