Analysis on the Variation Trend of Sandstorm in Northern China

By analyzing the historical meteorological data, ecological environment situation, physical and chemical characteristics of sandstorm aerosol in typical sandstorm process, air particle trajectory of moving sandstorm and other features, the occurring trends of sandstorm-frequent areas including Zhangye, Yongchang and Minqin of Gansu Province, Zhongwei of Ningxia Huizu Autonomous Region and Beijing are discussed. A preliminary conclusion is obtained that from the end of 1950s to 1992, the frequency of sandstorm occurring and their intensities in the areas mentioned above are decreased, which may be associated with the improvement of surface ecological environment situation.