Physics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..452k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, May 1986, p. 452-455.
Physics
Atmospheric Circulation, Geostrophic Wind, Mesoscale Phenomena, Mixing Length Flow Theory, Atmospheric Models, Flow Distribution
Scientific paper
The influence of horizontal geostrophic shears HGS on mixed layer (ML) deepening was investigated using two types of mesoscale structures: jets and eddies. The windstress was assumed to be constant and spatially homogeneous so that the influence of mean-flow shear could be discerned. Mean-flow divergence was neglected, and initial ML depth was assumed to be horizontally homogeneous. Numerical simulations revealed that the influence of HGS on ML deepening is directly related to the perturbation of the inertial frequency by a geostrophic vorticity field. ML deepening was found to be enhanced in negative vorticity regions, indicating that negative vorticity mesoscale structures should have a significant thermal signature within the ML. It is concluded that horizontal geostrophic shears significantly influence ML deepening and that this influence contributes to the irregular character of ML evolution.
Klein Phil
Le Saos J.-P.
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