河西走廊沙尘暴特征及气候成因分析

本文主要分析了河西走廊春季沙尘暴多发的原因,指出河西走廊所处的特殊的地理位置和独特的地形地貌以及干旱少雨的气候背景是沙尘暴频繁发生的主要原因。河西走廊的沙尘暴过程次数自1955年以来总体呈减少趋势,上世纪70年代最多,90年代最少。研究发现,河西走廊沙尘暴发生与东亚冬季风的强弱有直接关系．并且与前期秋、冬季赤道中东太平洋海温关系密切．海温偏高时,东亚冬季风较弱,河西走廊发生的沙尘暴较少,海温偏低时,东亚冬季风较强,河西走廊春季容易发生沙尘暴。

Characteristics and Climatic Forming Reasons of Sandstorm in Hexi Corridor

The reasons of sandstorm occurring frequently in spring in Hexi corridor were analyzed, we found special geographical location, particular topography and physiognomy and arid climatic background are the main reasons. The number of sandstorm occurring in Hexi corridor has decreased since 1955 in general,most in 1970 s', least in 1990 s'. The results show that the occurring of sandstorm in Hexi corridor connects with winter monsoon of East Asia, and has high correlation with SST of Middle East Pacific in prophase autumn and winter. When the SST was higher, the winter monsoon of East Asia would be weaker, the number of sandstorm occurring in Hexi corridor would be less than usual. On the contrary, it would be more.