山西省沙尘天气的时空分布特征分析

Spatial-temporal Distribution of Sand-dust Weather in Shanxi

山西省的浮尘日数在西部偏北和偏南地区分别有两个高频区,扬沙与沙尘暴日数的高频区具有一致性,主要分布在西北部。大部分地区的扬沙并沙尘暴日数呈总体下降的趋势,沙尘日数总体增加仅出现在个别地区。春季是沙尘天气的多发期。沙尘暴的发生有比较明显的日变化特征,白天较夜间更易发生沙尘暴,发生沙尘暴初始时刻的峰值出现在午后15 h～17 h。近47 a 来山西省的沙尘日数还没有表现出明显的周期性变化,沙尘日数在20世纪80年代前期发生了由多到少的跃变。

There are two locations of High Frequency of floating dust weather existing in north and south of the western area of Shanxi province respectively, the days of Sand- dust and sandstorm of the two areas have similar character in temporal change, the days of Sand - dust and sandstorm have decreasing trends in most areas. Dust storms occurs more frequently in spring than in the other seasons, more in daytime than night, and the initial peak value of the frequency is between 15h - 17h.The days of Sand - dust has not obvious periodicity in the recent 47 years and there is a abrupt reducing in former 1980s.