关键词: 沙尘天气, 沙尘暴源地, 年代际变化

Abstract: The data about sand-dust storms in Northwest and North China from 1952 to 2000 have been analyzed to get a comprehensive knowledge of distribution of sand-dust storms in China and to further under-stand their changing features and recent tendency. The sand-dust storm original sources in Northwest and North China mainly distribute in three regions: Hexi Corridor of Gansu Province and Alxa Plateau,southern rim of South Xinjiang Basin and central Inner Mongolia. The features on frequency variation of sand-dust storms in recent 50 years are as follows: a fluctuating increase during 1960s-1970s, a fluctuating decrease during 1980s-1990s and a rapid increase after the year of 2000. In the future, sand-dust storms may enter a new active period. The variation of sand-dust storm activities has a close relationship with the decadal changes of East Asia atmosphere circulation and changes of ecological environment.

Key words: sand-dust climate, sand-dust storm original, region decadal change