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| Causes and Surface Elements Characteristics of a Heavy Sand-storm in 2010 in Minqin of Gansu, China |
| Shen Jie1,2,3, Li Yaohui1, Hu Tiantian1,2, Yin Han1,2,4 |
1. Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Climatic Change and Disaster Reduction of China Meteorological Administration, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;
2. Atmospheric Science College, Lanzhou University, Lanzhou 730000, China;
3. Meteorological Bureau of Xining, Xining 810000, China;
4. Unit 93801 of Chinese People's Liberation Army, Xianyang 712000, Shannxi, China |
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Abstract By using the actual observation data and NCAR/NCEP reanalyzed data, this paper analyzes the atmospheric formations of a heavy sand-storm occurred in Minqin, Hexi Corridor on April 24, 2010, and discusses the pulsation characteristics of the surface layer meteorological factors. The heavy sand-storm weather was touched off mainly by Ural low trough before ridge, high level jet stream, surface thermal pressure and cold front etc. Characteristics of the surface layer meteorological factors are much significant in Minqin during the sand-storm process. Three-hour variation of surface atmospheric pressure obviously influences surface wind speed that presents fluctuant variation with about eight-hour period, and then causes the concentration of PM10 and visibility change fluctuantly. There are interactions among three-hour variation of surface atmospheric pressure, surface wind speed and PM10 concentration, and all present significantly pulsation characteristics.
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Received: 11 January 2013
Published: 20 March 2014
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Corresponding Authors:
李耀辉（Email：li-yaohui@163.com）
E-mail: li-yaohui@163.com
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2014, Vol. 34 
