摘要
利用１９８０～１９８８年ＥＣＭＷＦ的资料，计算了对流层５００ｈＰａ、３００ｈＰａ和平流层１００ｈＰａ逐日和月平均的纬向平均有效位能（ＰＺ），分析其季节过渡，比较不同纬度带的季节性急变．结果表明，在４月和１０月附近，各纬度带上均可出现ＰＺ的急变．而且用逐日资料还可分析出６月急变．在北半球对流层高层（１００ｈＰａ）ＰＺ的季节性急变不如低层（５００ｈＰａ）明显，而在南半球ＰＺ的季节性急变与北半球相反。
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.
出处
《应用气象学报》
CSCD
北大核心
1997年第2期137-146,共10页
Journal of Applied Meteorological Science
基金
高等学校博士学科点科研基金
