1911～2012年丹东市区百年降雪特性及其规律

Snowfall from 1911 to 2012 in Dandong:Characteristics and Law

根据丹东市区1911～2012年百年降雪资料,分析冬季降雪特性及年际变化。降雪评价参数分为时间要素和数量要素。丹东降雪要素特性值年平均初终间日数为97.4 d、降雪日数为12.0 d、年降雪总量为29.6 mm。数量要素年降雪总量1956年至今下降趋势明显。21世纪00年代比20世纪90年代减少36.5%。时间要素初终间日数80年代以后均值减少33.1%。时间和数量要素相关性分析,年降雪总量与大雪日数相关系数R2为0.77,年降雪总量64%是大雪以上贡献。

Characteristics and interannual change of snowfall in Dandong from 1911 to 2012 was studied by time and amount recorded in text materials. It is found that the interval between the first and last date of snowfall was averagely 94.7 d with 12.0 snowy days and total annual snowfall 29.6 mm. The annual snowfall has remarkably decreased since 1956. The snowfall in the first decade of the 21st century was 36.5% less than that in the 1990s. The interval between the first and last date of snowfall after the 1980s was 33.1% less than the average data. The correlation coefficient between annual snowfall and heavy snowy days is 0.77 and 64% of the annual snowfall is contributed by heavy snow.