Effects of an asymmetric friction on the nonlinear equilibration of a baroclinic system

Type Article
Date 1997-06
Language English
Author(s) Riviere Pascal1, Klein Patrice1, 2
Affiliation(s) 1 : IFREMER,LPO,F-28280 PLOUZANE,FRANCE.
Source Journal Of The Atmospheric Sciences (0022-4928) (Amer Meteorological Soc), 1997-06 , Vol. 54 , N. 12 , P. 1610-1627
DOI 10.1175/1520-0469(1997)054<1610:EOAAFO>2.0.CO;2
WOS© Times Cited 6
Abstract Following some recent linear and nonlinear studies the authors examine, using numerical simulations of a classical two-layer model, the effect of an asymmetric friction on the nonlinear equilibrium of moderately unstable baroclinic systems, The results show that the presence of an asymmetric friction leads to a significant wave scale selection: ''long'' waves (in terms of their zonal wavelengths) emerge with a traditional asymmetric friction (with the upper layer less viscous than the lower layer), while only ''short'' waves dominate with a nontraditional asymmetric friction (with the lower layer less viscous than the upper layer). The role of the nonlinear interactions and. more precisely, the effects of an asymmetric friction on the wave-mean flow and wave-wave interactions; and their consequences on the wave scale selection are examined.
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