气候变暖背景下大连地区积雪变化特征分析

为了清晰认识全球气候变暖背景下大连地区积雪的变化规律，更好地服务于农业生产，应用1960—2013年地面积雪观测资料，对大连地区积雪日数、积雪初终日变化特征进行了分析。结果表明：大连地区积雪日数呈单峰型分布，主要集中在1月份；20世纪60年代末至70年代前期，积雪日数明显偏多，为近54年的积雪特丰期；90年代中期是大连地区积雪的异常偏少期；大连地区积雪日数的变化与该地区气温变化存在较好的拟合性；大连地区积雪日数在1988年发生了突变，而大连地区冬季气温变化的突变点也是在1988年；大连地区的积雪日数空间变化与降雪频次分布并不一致，而与该地区的气温空间变化相一致。

Variation of Snow Cover in Dalian Under Global Climate Warming

The paper aims to clearly understand the characteristics of temporal and spatial variation of snow cover in Dalian Area under global climate warming, and serve agricultural production. Based on observation data of snow cover days from 1960 to 2013, the author analyzed temporal and spatial variation of snow cover days, first and last snow cover date in Dalian Region. The results showed that: monthly mean snow cover days had a temporal variation of single peak type, mainly concentrated in January. In recent 54 years, there were more snow cover days from the late 1960’s to the early 1970’s, and abnormal minimum snow cover days in the middle of 1990’s. The temporal variation of snow cover days was well consistent with the variation of winter temperature; both of them had the abrupt change in 1998. Spatial variation of snow cover days was similar to the spatial variation of temperature, but was not consistent with the snowfall frequency distribution.