皖东南地区寒潮的气候特征(简报)

Climatic Characteristics of Cold Waves in Southeastern Anhui Province

用皖东南地区１９６１年１０月１日～１９９１年３月３１日每年的冬半年气象资料统计分析，结果表明：（１）皖东南地区寒潮冷空气源于北冰洋，其路径８８％经蒙古人民共和国东部南下影响本地区。（２）全区性寒潮每年平均１．６次，但年际差异较大；２～３月份出现寒潮次数最多，１０月份无寒潮出现。（３）测站的海拔高度高则寒潮年平均次数多；宣城、郎溪、广德地区年平均次数最少，旌德、绩溪最多。（４）寒潮４８ｈ最大降温幅度为１９．４℃，２４ｈ最大降温幅度为１５．０℃；寒潮最低气温为－７．

Meterological statistics of winters during Oct.1,1961～Mar.31,1991 in southeastern Anhui province was analyzed.The cold air developing cold wave in southeastern Anhui originated in the Arctic,88% of which moved southward via Eastern Mongolia.The average number of cold wave in the region was 1 6/year,which varied a lot among years,and most of which appeared in Feb.and March,but no cold wave was observed in Oct.The higher the altitude of observatory station was,the more the average number of cold wave per year was observed.The greatest temperature drop resulted from cold wave was 19 4℃ in 48h and 15 0℃ in 24h.While the lowest temperature during cold wave was -7 7℃.