The processes of tropical semi-geostrophic adaptation |
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Authors: | Yonghui Lin Jiping Chao |
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Institution: | (1) Chinese Academy of Meteorological Sciences, 100081 Beijing, China;(2) National Research Center for Marine Environment Forecasts, 100081 Beijing, China |
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Abstract: | In tropical areas, when the zonal or meridional geostrophic equilibrium is destroyed, inertial gravity wave will be excited
by ageostrophic motion, with the dispersion of the wave, a new zonal or meridional geostrophic balance will be established
again, and it follows an invariant of semi-potential vorticity. Based on the invariant, it should be pointed out that the
direction of the zonal or meridional semi-geostrophic adaptation depends mainly upon the meridional characteristic scale of
initial disturbance. For the zonal (meridional) semi-geostrophic adaptation, if the zonal characteristic scale of initial
disturbance is big (small) enough, then the adaptation process always represents the mutual adjustment between the pressure
field and zonal (meridional) flow. |
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Keywords: | dispersion of inertial gravity wave semi-geostrophic adaptation scale criterion |
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