The effects of vertical shear and stratification on stationary rossby waves
作者:
C.B. Fandry,
L.M. Leslie,
期刊:
Geophysical & Astrophysical Fluid Dynamics
(Taylor Available online 1984)
卷期:
Volume 29,
issue 1-4
页码: 305-332
ISSN:0309-1929
年代: 1984
DOI:10.1080/03091928408248193
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The generation of stationary Rossby waves by sources of potential vorticity in a westerly flow is examined here in the context of a two-layer, quasi-geostrophic, β-plane model. The response in each layer consists of a combination of a barotropic Rossby wave disturbance that extends far downstream of the source, and a baroclinic disturbance which is evanescent or wave-like in character, depending on the shear and degree of stratification. Contributions from each of these modes in each layer are strongly dependent on the basic flows in each layer; the degree of stratification; and the depths of the two layers. The lower layer response is dominated by an evanescent baroclinic mode when the upper layer westerlies are much larger than those in the lower layer. In this case, weak stationary Rossby waves of large wavelengths are confined to the upper layer and the disturbance in the lower layer is confined to the source region.
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