1961-2015年汉中市秋季连阴雨时空分布特征

Temporal and Spatial Distribution Characteristics of the Autumn Continuous Raining in Hanzhong from 1960 to 2015

利用1961—2015年陕西省汉中市6个气象站点9—11月的逐日降水资料,应用现代气候统计诊断方法,从降水量、持续时间以及发生次数等方面出发,对汉中市秋季连阴雨的时空变化特征进行分析。结果表明:汉中市秋雨量占全年降雨量的近30%,其中秋季连阴雨量占全年降水的18.56%,约占秋雨量的60.37%。时间上,汉中市秋季连阴雨天气多出现在9月,10月次之,11月出现次数最少,持续时间为4~6 d为主。1961—2015汉中市秋季连阴雨次数和总日数总体均呈下降状态,但年际波动幅度较大。空间上,汉中秋季连阴雨呈南多北少、东多西少的特点。

Based on the daily precipitation data of 6 meteorological stations in Hanzhong during September November from 1961 to 2015,this paper analyses the temporal and spatial features of autumn continuous raining from aspects of precipitation amount,durative days,and frequency by means of modern diagnostic methods in meteorological statistics.The results show that the precipitation amount of autumn makes up about 30%of annual precipitation,and the precipitation on amount of continuous rainfall in autumn accounts for about 18.56%of annual precipitation is about 60.37%of the precipitation of autumn rainfall in Hanzhong.In terms of time,the continuous rainy weather in autumn in Hanzhong mainly occurs in September,followed by October,and the least in November.The continuous rainy weather in autumn is mainly 4~6 days.Both the frequency and the durative days with obvious inter annual dynamics have a decreasing trend in the mass.Spatially,autumn continuous raining in Hanzhong is much less in north than in south,and much less in west than in east.