关键词: 沙尘暴, 源地与路径, 天气气候成因, 中国北方

Abstract: The high-frequency of sandstorm occurrence in the Spring of 2000 over Northern China has been analyzed in respect of circulation background and synoptic-climatological theories. The results show that 1) there are three patterns of the source, course and weather to sandstorms in the Spring of 2000 over Northern China.;2) abundant duststorm origin resulting in the sandstorm outbreak comes from spreading desert area resulted from more intense drought and more severe wildness recently over Northern China;3) 2000 is the fastigium of La-Nina that means more intense monsoon over the east part of Asia in winter, at the same time, in the Spring of 2000 the pole eddies lie in near Xindi island of East-hemisphere, which results in cold air going down northward ready to form gale; 4) another abundant duststorm origin is from looser soil resulted from arid and rare rain in the spring of 2000 over Northern China, air temperature rising rapidly and high.

Key words: sandstorm, source and course, synoptic and climatological causes, Northern China