关键词: 雪灾, 西藏, 积雪厚度, 春季雪灾, 大气环流

Abstract: Using a variety of in-situ meteorological elements datas such as snow depth and NOAA atmospheric circulation data, the frequency of spring snow disasters at 27 stations in the eastern Tibet and corresponding atmospheric circulation anomalies during 1979―2014 were analyzed. The results showed that there were 33 snowstorms in 27 stations in eastern Tibet during 1979―2014. The snowstorm was mainly concentrated in the area between the Tanggula mountains and the Nyenchenthanglha mountains and the southern part of Shannan; The greater the maximum snow thickness and the total snowfall during the snowstorm, and the greater the average snow thickness of the snowstorm. The greater the relative humidity, the greater the average snow thickness during the light-level disaster. The greater the wind speed, the greater the average snow thickness during the light-level disaster and the middle-level disaster; During the light-level disaster and the middle-level disaster, there were “+-+-+” and “+-+-+-” wave train propagating from the Atlantic to the western Pacific through the high latitude. During the severe-level disaster, the intensity of the North Atlantic negative geopotential height anomalies was stronger than the one during the light-level disaster and the middle-level disaster, and there was a "+-+-+-" wave train propagating from the Atlantic to the western Pacific through the mid-latitude.

Key words: snow disaster, Tibet, snow depth, spring snow disaster, atmospheric circulation