80年代两次厄尔尼诺期间西太平洋及其邻近海区大气加热场的差异

THE DIFFERENCE BETWEEN ATMOSPHERIC HEATING FIELDS OVER THE WEST PACIFIC AND ITS SURROUNDING SEA AREA DURING TWICE El Nino EVENTS IN THE 1980S

本文分析了1986—1987年与1982—1983年两次厄尔尼诺过程中西太平洋及其邻近海区大气加热场的差异。结果表明:(1)两次厄尔尼诺过程西太平洋及其邻近海区上空大气都是一个很强的热源区,且后一次比前一次更强;(2)两次厄尔尼诺的最强加热区明显不同,后一次的加热场分布异常偏北,前一次又异常偏南,这与同期赤道低压带的变化一致;(3)大气加热强度的明显不同主要是降水潜热的增长不一致形成的。

In this paper, the difference between atmospheric heating fields over the West Pacific and its surrounding sea area during twice El Nino processes in 1986-1987 and 1982 -1983 is analysed.The results show that: (l)Atmospheric heating fields over the West Pacific and its surrounding sea area are very strong heat source during twice El Nino processes. But atmospheric heating intensity is stronger in the last El Nino time than in the first time. (2)There is evident difference for the location of strongest heating regions during twice El Nino.The distribution region of atmospheric heating field is unusual inclined toward north in tne last El Nino time and it is unusual inclined toward south in the first time. It is in agreement with variation of equatorial low belt in same period. (3)The difference of atmospheric heating intensities is mainly caused by the different of increasing latent heat of precipitation.