【摘要】 本文用北半球平流层20年月平均的高度资料分析了北半球平流层30、50和100hPa各层平均高度的时、空分布、年变程、月变程以及平均环流的演变特征。分析指出北半球平流层大气环流由冬到夏表现为:由极地涡旋完全转变为极地高压,高层(30 hPa在4月中完成)比低层(100hPa在6月完成)早一个月以上;由夏到冬反之,由极地高压完全转变成极地涡旋,高层(50hPa在8月中完成)比低层(100hPa在10月完成)也提前一个月以上。把这些基本事实与对流层的环流年变相结合,将有助于长期天气预报。更多还原

【Abstract】 In this paper, based on the 20 year’s data, we analysed the monthly mean stratospheric circulations of northern hemisphere over 30, 50, and 100 hPa. Their spatial distribution as well as annual and interannual variation were obtained.It points out that the general circulation change of stratosphere over northern hemisphere from winter to summer appears to be the revolution from the vortex to anticyclone over polar region.The change in the higher layer about 30 hPa is in April which is about more than one month earlier than in the lower layer about 100 hPa. On the contrary, from summer to winter the anticyclone over polar region is changed into vortex. It is ended in August in higher layer near 50 hPa which is more than one month earier than in the lower layer near 100 hPa. All these results are useful for the seasonal prediction.更多还原