菏泽市近40年来寒潮统计与分析

Statistics and Analysis of Cold Wave in Heze City in Recent 40 Years

利用菏泽市9个代表站1961-2000年40年的逐日温度资料，对菏泽市寒潮的发生、变化及天气气候特征进行了系统分析，并对其时空分布进行了分析。结果表明，近40年菏泽市寒潮天气出现次数整体呈减少趋势，寒潮区域分布具有一定的规律性，西北部偏少，中东部偏多；降温幅度有一定差异，由西北向东南递减；年际变化悬殊较大，递变规律明显，但与前期气候状况关系不明显。

The daily temperature data at 9 representative stations in Heze City in recent 40 years （ 1961 - 2000） were used to systematically analyze the occurrence and changes of cold wave and the climate characteristics. Its temporal and spatial distribution were analyzed. Result showed that the cold wave in Heze City reduced in recent 40 years,the regional distribution of cold wave showed certain regularity with few in northeast part and more in middle east part. Temperature drop range had differences with descending from northwest to southeast.Annual variation had great disparity with significant grading law, but its relation with preliminary climate condition was not obvious.