新疆近50年沙尘暴灾害变化趋势分析

Analysis of sandstorm disaster in Xinjiang in recent 50 Years

采用新疆88个气象站近50年的气象资料,分析新疆沙尘暴时空分布特征、年际和年内演变趋势及年际演变的影响因素。结果显示:新疆沙尘暴近50年以来空间分布特征是南疆多于北疆,南疆多发时期4-10月,北疆多发时期3-9月;年际演变趋势20世纪80年代以来较60、70年代都有所减少;80年代以后虽然沙尘暴发生日数减少,但是沙尘暴重大灾情还是较高,并灾情波动式增加;主要原因是,易受灾面积扩大。

Using the weather data of 88 meteorological stations in Xinjiang in recent 50 years,we analyzed the sandstorm time-space distribution attributes,annual and monthly evolution trend and the influencial factors for evolution trends.The result showed that sandstorms in Southern Xinjiang were more than that in North Xinjiang and they occured mostly from April to October in South and from March to September in North.Since 1980s,the sandstorms were decreased compared with 1960s and 1970s.Though since 1980s the number of sandstormd was decreased,heavy sandstorm disasters were still so high,disasters increased in a fluetuatiry way;the main reason was the increass of areas which is so easily influenced.