The regional characteristics of dust events in China has been mainly studied by using thedata of dust storm, wind-blown sand and floating dust from 338 observation stations through Chinafrom 1954 to 2000. The results of this study are as follows: (1) In China, there are two high frequentareas of dust events, one is located in the area of Minfeng and Hotan in the South Xinjiang Basin,the other is situated in the area of Minqin and Jilantai in the Hexi Region. Furthermore, the spatialdistributions of the various types of dust events are different. The dust storms mainly occur in thearid and semiarid areas covering the deserts and the areas undergoing desertificafion in northernChina. Wind-blown sand and floating-dust not only occur in the areas where dust storms occur, butalso extend to the neighboring areas. The range of wind-blown sand extends northeastward andsoutheastward, but floating-dust mainly extends southeastward to the low-latitude region such as theEast China Plain and the area of the middle and lower reaches of the Yangtze River. Compared withwind-blown sand, the floating-dust seldom occurs in the high latitude areas such as North Xinjiangand Northeast China. (2) The affected areas of dust storms can be divided into seven sub-regions,that is, North Xinjiang Region, South Xinjiang Region, Hexi Region, Qaidam Basin Region, HetaoRegion, Northeastern China Region and Qinghai-Xizang (Tibet) Region. The area of the mostfrequent occurrence of dust storms and floating-dust is in South Xinjiang Region, and of wind-blownsand in the Hexi Region. In general, the frequency of dust events in all the seven regions shows adecreasing tendency fiom 1954 to 2000, but there are certain differences between various dust eventsin different regions. The maximum interannual change and variance of dust events during this timehappened in South Xinjiang Region and Hexi Region. The dust events generally occur mostfrequently in April in most parts of China. The spring occurred days of dust events occupied 60-70%of the whole year in Hetao Region and Northeastern China Region. However, in South XinjiangRegion and North Xinjiang Region, which was less affected by monsoon climate, dust events mayoccur at any time of the year, less than 50% of the events in this region occur during spring. In theremaining three regions 50-60% of the dust events occur in spring of a year.
dust eventsregional characteristics
王式功、王金艳、周自江、SHANG Kezheng、Yang Debao、ZHAO Zongsuo
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Department of Atmospheric Science, College of Resources & Environment, Lanzhou University, Lanzhou 730000, China
National Meteorological Center, Beijing 100081, China
93864 Army 75 Unit Xinjiang, Changji 831112, China
NETL
NSTL
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