海温气候振动和北半球对流层高度场变化

The Climatic Change of SST in the Northern Pacific and Troposphere Geopotential Height Field over the Northern Hemisphere

近40年赤道太平洋和北太平洋月平均海温距平场分布存在着短期气候振动,分析表明,它对大气环流有一定的影响。在海温气候振动的前期位相时期,对流层平均高度有降低趋势,相反在海温气候振动的后期位相时期,对流层平均高度为增高趋势。这种相关关系高层比低层要好,低纬度较中高纬度稳定,夏季较冬季明显。

Distributions of monthly sea surface temperature(SST) anomaly field over the equatorial Pacific and the northern Pacific have short-term climatic oscillations in the past 40 years. Analysis shows that the tropospheric geopotential heights over the Northern Hemisphere have certain effects upon the general circulation and during the first phase period of SST climatic oscillation (before mid-1970s) ,the mean height of troposphere has a falling tendency. However,during the latter phase period, it has a rising tendency. The results suggest that this kind of correlation at the upper level is better than that at the lower level, it is more stable over the low latitudes than that over the mid- and high latitudes and distinctive in the summer than that in winter.