The Seasonal Rapid Changes of Global Potential Energy at Different Latitudes

Utilizing the data of monthly mean of the zonal potential energy (PZ) over the entire globe at different latitudes and levels, the seasonal rapid changes (SRC) in the entire circulation in terms of these potential energy modes have been investigated. The results show that seasonal rapid changes of PZ take place generally in April and October at every latitude, and the rapid changes in June also are analysed by using daily data. As to upper and lower levels, the seasonal rapid changes of PZ at lower level (500 hPa) are more obviously than those at upper level (100 hPa) of the Northern Hemisphere, and it is opposite to the Southern Hemisphere