On the Seasonal Transition in Global Kinetic Energy at 100hPa and 300hPa

Utilizing the data of monthly mean of the zonal kinetic energy(KZ)and eddy kinetic energy(KE)over the entire globe at 500hPa, 300hPa and 100hPa during the period of 1980-1988,the seasonal rapid changes(SRC)in the general circulation in terms of these kinetic energy modes have been investigated.Three main results are obtained. First,seasonal rapid changes of KZ take place generally in March.April and October at the three levels over the northern extratropical and tropical belts,but in the south only in the tropic there exist rapid changes.Second,in June there are also seasonal rapid changes of KZ over the northern tropic at 100hPa and 500hPa,which are located at the lower stratosphere and midtroposphere,Third,rapid changes at 100hPa are often more obvious than that at 300hPa.And the seasonal changes for KZ at the three level,are more significant than that for KE.

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