【摘要】 根据南疆15个气候业务代表站1960~2016年逐月沙尘暴观测资料,采用Mann-Kendall检验、Morlet小波分析等方法,对近56年间南疆沙尘暴的年代际变化趋势、突变及多时间尺度变化特征等进行了研究。结果表明:1)近56年来南疆沙尘暴发生日数呈明显的下降趋势;2)巴州南部与和田地区沙尘暴发生日数存在突变,突变点分别出现在1987年、1992年;3)小波分析显示南疆沙尘暴存在不同时间尺度上的周期振荡,目前南疆基本处在新一轮沙尘暴多发期的前期。更多还原

【Abstract】 Based on the mean monthly sandstorm data of the 15 representative stations in Xinjiang during 1960 ~2016,interdecadal variation,mutation change and the multiple time-scale variation characteristics of sandstorm in south Xinjiang were analyzed by applying Mann-Kendall test and Morletwavelet analysis. The results are as follows:(1)The days occurring the dust storms in south Xinjiang were declined significantly in the past 56 years.(2)There was some abrupt changes of sandstorm occurrence in the eastern part of Bazhou and Khotan,and the abrupt change points were in 1987 and 1992 respectively.(3)The wavelet analysis showed that the periodic oscillations were disappearing in different time scales in every study region. And it was predicted that the research areas were in the early stage of a new cyclical period of high-sandstorm.更多还原