1962—2008年辽宁省积雪变化特征

Characteristics of snow cover from 1962 to 2008 in Liaoning province

采用1962—2008年辽宁省52个气象观测站逐日积雪深度以及同期温度、降水资料,用统计方法和小波方法分析了辽宁省积雪气候变化规律。结果表明:近47 a辽宁省年积雪日数呈不显著增加趋势,共增加了3 d;年最大雪深随时间变化呈不明显增加趋势,平均每10 a增加0.2 cm;年累积雪深也呈不显著增加趋势,气候倾向率为8.9 cm/10 a。从年代际变化来看,20世纪80年代前辽宁省年积雪日数、年最大雪深和年累积雪深偏小;而20世纪80年代后至今,则经历了一个年积雪日数、年最大雪深和年累积雪深均增加的过程。

Based on the daily snow cover depth,temperature and precipitation at 52 weather stations from 1962 to 2008,the characteristics of snow cover variation were analyzed using methods of a statistics and a wavelet analysis.The results indicated that the increasing trend of annual snow cover days is not significant and it only increases 3 d from 1962 to 2008.The increasing trend of annual maximum snow cover depth is also not significant with 0.2 cm/decade,so is that of annual cumulative snow cover depth with 8.9 cm/decade.The number of snow cover days,annual maximum snow cover depth and annual cumulative snow cover depth are all relatively small before 1980s in terms of their inter-decadal variations,while they all increase after 1980s.