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JOURNAL OF DESERT RESEARCH  2008, Vol. 28 Issue (2): 349-356    DOI:
天气与气候     
Analysis on a Gust Front Event in Arid Area of Northwest China
HU Wen-dong1; TAO Lin-ke2; YANG Kan1,3; JI Xiao-ling1,3; DING Jian-jun1,3; YANG You-lin1,2
1.Key Laboratory of Meteorological Disaster Preventing and Reducing of Ningxia, Yinchuan 750002, China; 2.Wuzhong Meteorological Bureau of Ningxia, Wuzhong 751100, Ningxia, China; 3.Ningxia Meteorological Observatory, Yinchuan 750002, China
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Abstract  The new generation weather radar(CINRAD) data, intensively observed data from automatic meteorological stations and the products of meso-scale numerical model MM5 were used to analyze a gust front event in Yinchuan in arid Northwest China on 7 June 2004 based on the radar meteorological and meso-meteorological theories. The results show that the gust front was triggered by strong down draft and the gust front had caused the increase of wind speed and relative humidity and the decrease of temperature. After the weakening of the convective cloud cluster, the gust front marched on 32 minutes along its previous route. The length of the gust front expanded to more than 40 km and width to 3 km, and with a main body height of 1 500 m. The instable stratification of atmosphere was favorable for the convection. The cold air at 500 hPa rushed down because of the gravity and its combination with the down draft of the vertical circulation of convection were the fundamental reason of violent downing current. As the gust front moving eastward, the cold air was heated by the warm surface and lost it momentum because of the friction, when it climbed the Mt. Helan, the environmental temperature dropped along with the elevation increased, and the gust front disappeared as the temperature before and after the front reached the balance. The local meso-scale numeric model has a good capability to simulate the gust front.
Key words:  gust front      Doppler weather radar      products of numerical model MM5      analysis     
Received:  25 December 2006      Published:  20 March 2008
ZTFLH:  P446  

Cite this article: 

HU Wen-dong;TAO Lin-ke;YANG Kan;JI Xiao-ling;DING Jian-jun;YANG You-lin;. Analysis on a Gust Front Event in Arid Area of Northwest China. JOURNAL OF DESERT RESEARCH, 2008, 28(2): 349-356.

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http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2008/V28/I2/349

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