新疆哈密区域寒潮天气统计特征

根据寒潮标准，对新疆东部哈密区域50年的寒潮天气进行统计。结果表明：新疆哈密地区寒潮最早出现在9月2～3日，最晚出现在5月22～23日；四季中春季出现最多，为101次，秋季41次，冬季27次；50年来哈密地区寒潮天气过程出现次数总体呈现减少趋势；哈密地区北部寒潮出现频次、强度高于哈密地区南部，初寒潮北部早于南部，终寒湖北部晚于南部；寒潮入侵路径主要有4条：西方路径、西北路径、北方路径和超极地路径。

Statistical Characteristics of Cold Wave Weather in Hami Region in East Xinjiang

In accordance with the cold wave standard, a statistics was made on the cold weather during past 50 years in Hami region in east Xinjian. The results showed that The earliest cold wave in Hami region in east Xinjiang appeared first in September 2 to 3,the latest in May 22 to 23. As for the four seasons, the most cold waves appeared in spring, up to 101 times,41 times in autumn and 27 times in winter. During the past 50 years the occurrences of the cold wave weather process in Hami region showed a decreasing trend generally. The frequency and the intensity of the cold waves in north Hami were higher than those in south Hami. The earliest cold wave in north Hami was earlier than that in south Hami, the latest cold wave in north Hami was later than that in south Hami. There were 4 cold air intrusion path, namely western path,northweat path, north path and north polar path.