Global structures of stationary planetary waves in the middle atmosphere

Mathematics – Logic

Scientific paper

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Atmospheric Models, Middle Atmosphere, Planetary Waves, Wind Profiles, Annual Variations, Atmospheric Boundary Layer, Geostrophic Wind, Primitive Equations, Zonal Flow (Meteorology)

Scientific paper

The linearized primitive equations in spherical coordinates are used to investigate global structures of stationary planetary waves in the middle atmosphere. The observed heights are imposed as the lower boundary condition under realistic zonal wind configurations at the winter solstice and the vernal equinox of the Northern Hemisphere. For the winter season, it is found that the calculated amplitudes of wavenumber 1 in the global primitive model are approximately one-half the observed ones; those of wavenumber = 2, however, are nearly the same. In the phase profiles for the two wavenumbers, no remarkable differences are observed between the calculated and observed values. What is more, it is noted that maximum geopotential amplitudes of wavenumber = 1 and 2 are located approximately 10 deg latitude north of the jet maximum; this is due mainly to the lack of an artificial rigid boundary at the equator. In the equinox season, interhemispheric coupling through the waves is demonstrated. Attention is also given to zonal flow acceleration arising from the waves as it relates to semiannual oscillation.

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