关键词: 西北地区东部, 冬季降水量, 次年沙尘日数

Abstract: The distribution and variation of precipitation in winter in northwest region is analysed and seven sections is divided by using EOF and REOF method and the data including winter precipitation and sandy days data of 88 weather stations. The result showed The result showed that the precipitation in winter in northwest is different from regions in all around, the first load vector of 7 sections is different, the zero position of the second load vector is between arid region and clouding region. A section including Minqin and some other stations represented desert climate, and C section including Dunhuang and some other stations represented desert and Gebi influenced by west wind cincture .The variety trend of the winter precipitation of A and C sections is contrary with sandy days of the next year, but there are no contrary variety of other sections between winter precipitation and sandy days of the next year. All those means that the soil humidity and surface roughness in Spring are influenced by the winter precipitation of previous year, therefore,the sandy days of A, C section is influenced by the winter precipitation of previous year,but the other sections isn't influenced.

Key words: East of northwest region, winter precipitation, sandy days of the next year