通辽市区域性大到暴雪时空分布特征分析

文章利用1961-2013年的日降水量、积雪深度等资料,对通辽市11站区域性大到暴雪进行了统计分析,53年共出现区域性大到暴雪过程72次,对其时空特征分析,结果表明:通辽市区域性大到暴雪过程一般出现在冬半年的10月-次年4月之间,以3月最多、4月次之,冬半年在11月和次年的3月出现双峰值,隆冬季节的1月份最少;从冬半年各季节分布看,春季发生最多、秋季次之、冬季最少;53年年际变化没有增加或减少趋势,最多年份出现在1976年和1990年,为5次;大到暴雪空间分布为从通辽市的东南向西北递减,库伦旗发生最多、科左后旗次之,也即随纬度升高而减少。

Analysis the Spatial and Temporal Distribution Characteristics of Heavy Snowstorm in Tongliao

Using the ground daily precipitation and snow depth from 1961 to 2013 observed by 11 stations in Tongliao,we statistical analysis the temporal and spatial characteristics of 72 times occurrences of heavy snowstorms in 53 years.It shows that:in the Tongliao region,the process of heavy snowstorm generally happens in October to April,with the majority of occurrences in March and followed by April.The peaks were occurred both in November of the winter half years and the March of the next years,while at least in January in the midwinter.From the perspective of the distribution of each season in the winter half year,the most occurrence occurs in spring,followed by autumn and least in winter.The interannual change of 53a showed no increasing or decreasing trend.The spatial distribution of snowstorm decreases from southeast to northwest in Tongliao,the most occurrence occurs in Kulun station,followed by Kezuohouqi station.Snowfall decreases with increasing latitude.