关键词: 南疆, 沙尘暴, 时空分布

Abstract: In this paper,the spatial and temporal distribution characteristics of sandstorm were analyzed based on the 39 years sandstorm data from 1961 to 1999 at 42 weather stations in South Xinjiang.The results are as follows:①Sandstorm occurs most frequently in Taklimakan desert,and more in the southern periphery than in the others of the desert.②Sandstorm occurs more frequently in 1970s,and has been decreasing since 1990.③Sandstorm occurs mainly from March to August,and more frequently from April to June.④There are occurrences of sandstorms all-day in Tarim Basin,more frequently during 2:00~6:00,11:00~15:00 and 19:00~24:00 o'clock,while during 15:00~22:00 o'clock in the other regions.⑤The persistence time of sandstorm is within 30 minutes in most regions,but within 2.5 hours in the periphery of Tarim Basin.The longest persistence time of sandstorm is over 20 hours in the periphery of Tarim Basin,and within 10 hours in the others.

Key words: South Xinjiang, sandstorm, spatial and temporal distribution of sandstorm