黄土高原沙尘暴时空分布格局及变化趋势分析

The Spatial and Temporal Distribution of Sand-dust Storms and Tendency in the Loess Plateau

研究了黄土高原地区沙尘暴的时空分布格局和变化趋势,主要的工作包括利用黄土高原地区253个旗县市气象站20世纪50年代至1984年沙尘暴的多年平均值做空间插值,结合遥感影像,分析了沙尘暴的空间分布格局,呈现出从西北向东南先增多后减少,北多南少的分布。利用1961-2000年沙尘暴记录分析了沙尘暴年内的季节分布,发现沙尘暴主要发生在春季,尤其是4月。最后,对40a间沙尘暴进行了趋势分析,发现该区沙尘暴有明显的减少趋势,在1984年发生了明显转折,这种减少趋势在空间上不具有明显差异。

In this paper, the spatial and temporal distribution and tendency of sand-dust storms in the Loess Plateau region was analyzed. The main of work includes that use records from 253 weather stations at loess plateau to do spatial interpolation, combine with remote sensing image analyzed the spatial distribution pattern of dust storm. The reaults showed that： the annual number of sand-dust storms increasing from north-west to south-east, North have more than South. Sand-dust storms mainly occurred in the spring, especially April. Finally, 40 years records present a decrease trend, which has a high consistency throughout the region.