| 天气与气候 |
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| Case Study of Dynamical and Thermo-dynamical Structureof Serve Dust-storm in Summer |
| YUE Ping1,2,3, NIU Sheng-jie3, ZHANG Qiang1, SHEN Jian-guo4 |
| 1.Institute of Arid Meteorology, China Meteorology Administration; Opening Key Laboratory of Arid Climatic Changing and Reducing Disaster of China Meteorology Administration; Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province, Lanzhou 730020, China; 2.Zhangye National Climatological Observatory, Zhangye 734000, Gansu, China; 3.KLME, Nanjing University of Information Science & Technology, Nanjing 210044, China; 4.Inner Mongolia Autonomous Region Meteorological Bureau, Hohhot 010051, China |
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Abstract According to the formation mechanism of dust-storm stimulated by serve convection system under hot-low, the thermodynamical structure of a dust-storm which occurred in the Jiuquan area of Gansu Province at 20:00 on July 12, 2004 was analyzed based on the theory of hot-engine natural convection proposed by Renn and Ingersoll in 1996. Findings are as follows: ①The atmospheric bottom layer was dry and heat in an hour before dust-storm occurrence, and there was extreme temperature grade between 200 hPa and 300 hPa, which was advantageous to the development of dry convection. ②The intensity of the dust-storm was closely related to the tangential and vertical velocity of micro-scale and meso-scale convections. Being computed by the sounding data from Jiuquan station the tangential velocity of dust-storm was 11.4 m·s-1 and the vertical velocity was 14 m·s-1; the maximal surrounding velocity recorded by the surface dust-storm observational system was only 9.3 m·s-1, and the average was 5.5 m·s-1.
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Received: 13 February 2007
Published: 20 May 2008
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2008, Vol. 28 
