埃尔-尼诺发生前的冬季,西北太平洋副热带高压的特征

CHARACTERISTICS OF THE NORTHWEST PACIFIC SUBTROPIC HIGH IN WINTER PRIOR TO EL NINO

本文对1951～1990年西北太平洋副热带高压特征量资料进行了普查分析,找出了在埃尔-尼诺发生前的冬季副热带高压偏弱,其面积指数、强度指数偏低,脊线位置及588线北界位置偏南的特征。文中对副热带高压强度指数进行了较详细的分析,通过对1～3月份副热带高压强度指数距平和逐年进行累加后发现,低谷处为埃尔-尼诺发生年。

In this paper, the characteristic data ( 1951 ?1990)on the Northwest Pacific su-btropic high have been analysed. The results show that the intensity of Northwest Pacific subtropic high is weak in winter prior to El Nino, and its area index and intensit index are low,The location of the ridge line and the north boundary of line 588 are further south.The intensity index of Northwest Pacific subtropic high has been analysed in detail and the departure sum of the subtropic high intensity index during January桵arch has been accumulated year byyear, finding that the El Nino year. appears in the valley of the accumulated intensity index.