Eddy saturation in a reduced two-level model of the atmosphere
Eddy saturation in a reduced two-level model of the atmosphere
复制标题
大气两级简化模型中的涡饱和
DOI:
10.1080/03091929.2021.1990912
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发表时间:
2021
影响因子:
1.3
通讯作者:
Kobras M
中科院分区:
文献类型:
--
作者:
Kobras M
Eddy saturation describes the nonlinear mechanism in geophysical flows whereby, when average conditions are considered, direct forcing of the zonal flow increases the eddy kinetic energy, while the energy associated with the zonal flow does not increase. Here, we present a minimal baroclinic model that exhibits complete eddy saturation. Starting from Phillips' classical quasi-geostrophic two-level model on the beta channel of the mid-latitudes, we derive a reduced order model comprising of six ordinary differential equations including parameterised eddies. This model features two physically realisable steady state solutions, one a purely zonal flow and one where, additionally, finite eddy motions are present. As the baroclinic forcing in the form of diabatic heating is increased, the zonal solution loses stability and the eddy solution becomes attracting. After this bifurcation, the zonal components of the solution are independent of the baroclinic forcing, and the excess of heat in the low latitudes is efficiently transported northwards by finite eddies, in the spirit of baroclinic adjustment.
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DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
V. Lucarini;A. Speranza;R. Vitolo
通讯作者:
R. Vitolo
影响因子:
3.1
作者:
Harvey B
通讯作者:
Harvey B
DOI:
--
发表时间:
1983
期刊:
影响因子:
--
作者:
B. Sawford;J. Frederiksen
通讯作者:
J. Frederiksen
DOI:
10.48550/arxiv.1610.00621
发表时间:
2016
期刊:
--
影响因子:
--
作者:
Mak J
通讯作者:
Mak J
影响因子:
3.5
作者:
Nadeau, Louis-Philippe;Ferrari, Raffaele
通讯作者:
Ferrari, Raffaele