| 天气与气候 |
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| Analysis on Cause of Strong Sandstorm Occurring in Middle Gansu Province |
| YANG Xian-rong1,2, WANG Jin-song1,2, HE Yu-chun3, DENG Ji-lu3, REN Yu-long1,2, YANG Wen-yue3 |
| 1.Institute of Arid Meteorology, CMA; Key Open Laboratory of Arid Climate Change and Disaster Reduction of CMA; Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Lanzhou 730020, China; 2.Open Laboratory for Climate Studies, China Meteorological Administration, Beijing 100081, China;3.Linxia Meteorological Bureau of Gansu Province, Linxia 731100, Gansu, China |
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Abstract This paper researched the characteristics and causes of strong sandstorms invading the middle area of Gansu through analyzing the weather system by using the high and surface data from 1970 to 2006. The results show that a 500 hPa air jet (≥20 m·s-1) came forth when sandstorm occurred in the southeast of Wuwei city of Gansu. The sandstorm speeded up and became more intense in effect of Hexi Corridor topography. Sandstorm climbed across the Wushaoling Mountain, then swept large extent of Baiyin, Lanzhou and Linxia etc. Entering the 21st Century, the frequency of sandstorm and strong sandstorm increases, the intensity strengthens and the influencing region widens.
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Received: 04 May 2007
Published: 20 May 2008
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2008, Vol. 28 
