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Ekman boundary layer interactions in a numerical model of the general circulation

✍ Scribed by P. J. Everson; D. R. Davies

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
510 KB
Volume
98
Category
Article
ISSN
0035-9009

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✦ Synopsis

Abstract

A representation of an ‘Ekman’ type of boundary layer (assumed to extend from 1,000 mb to 900 mb) is inserted into a two‐level, quasi‐geostrophic, general circulation numerical model. An approximate time‐dependent analytic solution of this boundary layer is matched to the ‘free atmosphere’ régime of the model through the vertical velocities produced at the grid points. By using this analytic solution the essential physical characteristic of the observed continuous increase with height of scale length of turbulence in the boundary layer is represented. By comparing time integrations of two models, only one of which contains an Ekman layer, it is shown that large‐scale flow characteristics, expressed in terms of growth rate of zonal and eddy kinetic energy, are sensitively dependent on the presence of such a layer in a numerical model.

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