Eigenfrequencies and Horizontal Structure of Divergent Barotropic Instability Originating in Tropical Latitudes

摘要: Abstract Instabilities arising on a latitudinally sheared mean flow fall into one of at least two classes: inertial instabilities associated with reversed potential vorticity and barotropic meridional gradient vorticity. Both types instability are described by the generalized Laplace tidal equation, horizontal structure equation that explicitly includes effect divergence disturbances. The has not been extensively studied. A systematic investigation eigenfunctions for monotonic zonal wind profiles having single, narrow region in tropical latitudes reveals that, limit low planetary wavenumber, modes bifurcate weakly divergent hemispheric scale, strongly divergent, “internal” trapped about source region, i.e....