General Circulation over Northern Hemisphere and High Temperature over Guangxi in Summer
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Abstract:
By means of the monthly mean height data at 500 hPa from 1951 to 2003 over the Northern Hemisphere,a contrast analysis is made of the difference in the large-scale atmospheric circulation between the years with more-than-normal high temperature days and the years with less-than-normal high temperature days in Guangxi Autcnomous Region.It is found that the anomalous geopotential height fields at 500 hPa between more-than-normal and less-than-normal high temperature years are evidently different.From the Aleutian Islands in the North Pacific Ocean to the subtropical zone,there exist contrary distributions of the north-south anomaly in spring, winter,and in the pre-flood period.In midsummer,the areas from Ural to Baikal and from the Bay of Bengal to the southwestern China have positive anomaly in more-than-normal years,and have negative anomaly in less-than-normal high temperature years.The canonical correlation analysis indicates that there is close relation between the geopotential height field at 500 hPa in midsummer(July to August) and those of previous January and April to June.There is autocorrelation in the intencity distribution of the upper trough and ridge and the change of large-scale weather systems such as the West Pacific Subtropical High,which can explain the fact that the anomalies of the large-scale circulation result in the formation of high temperature weather.
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P457.3 P434
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.