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- Publisher
- American Meteorological Society
- Copyright
- Copyright © 2002 American Meteorological Society
- ISSN
- 1520-0485
- DOI
- 10.1175/1520-0485(2004)034<2057:FIAIWF>2.0.CO;2
- Publisher site
- See Article on Publisher Site
Abstract
The effect of the parameterization of lateral friction on the separation of western boundary currents is addressed in an idealized context. The study is motivated by a puzzling issue that arises from the nonlinear theory of the wind-driven double-gyre circulation in shallow-water models. Subtle changes in the representation of the lateral friction in these models have a substantial effect on both steady-state and transient flows. The aim of this paper is to explain how lateral friction introduces a north––south asymmetry in the steady double-gyre flows and why the degree of this asymmetry depends on the type of frictional parameterization. A more conceptual model of a zonal jet in a channel turns out to be very useful to determine the dynamical processes behind the asymmetries. It is also shown that the north––south asymmetries have an impact on the low-frequency variability of the time-dependent flows. This is caused by changes in stability behavior of the steady-state flows.
Journal
Journal of Physical Oceanography – American Meteorological Society
Published: Jun 14, 2002