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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (1): 187-194    DOI: 10.7522/j.issn.1000-694X.2013.00027
Weather and Climate     
The Turning Causes of Trough to Ridge in a Typical Black Sandstorm Process Occurred in North-west China
LI Yan-ying1,2, XU Dong-bei3, CHEN Ying4
1.Key laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;
2.Wuwei Meteorological Burea, Wuwei 733000, Gansu, China; 3.Lanzhou Central Meteorology Observatory, Lanzhou 730020, China; 4.Minqin Meteorological Burea, Minqin 733300, Gansu, China
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Abstract  

On April 24-27, 2010, a strong sandstorm and gale process occurred in Hexi Corridor, Gansu, developed to black sandstorm and affected most areas in north-west China, brought about serious economic loss. In order to have a thorough understand over the causes of that disastrous weather process, we analyzed and compared the weather circulation changes, the high vertical wind fields, and the horizontal relative helicities of this black sandstorm process. The daily surface to upper wind grid data at 08:00 and 20:00 and the upper weather maps and three-hourly surface weather maps were used to calculate the horizontal helicities from near ground surface up to 500 hPa from March to May during 2002-2011. The results showed that the strong cold air at 700-500 hPa, the violent unstable atmospheric layer at 700 hPa, and the helicity’s negative value less than -1 000 m2·s-2 at 20:00 on April 24 were dynastic factors leading to the outbreak of the black sandstorm. The existence of low-level jet bigger or equal 15 m·s-1 at 700 hPa at 08:00 on April 25-27 was a critical factor for the windstorm to form and last.

Key words:  low-level jet      vertical wind field      horizontal relative helicity      black sandstorm     
Received:  08 June 2012      Published:  20 January 2013
ZTFLH:  P445.4  
Articles by authors
LI Yan-ying1
2
XU Dong-bei3
CHEN Ying4

Cite this article: 

LI Yan-ying1,2, XU Dong-bei3, CHEN Ying4. The Turning Causes of Trough to Ridge in a Typical Black Sandstorm Process Occurred in North-west China. JOURNAL OF DESERT RESEARCH, 2013, 33(1): 187-194.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00027     OR     http://www.desert.ac.cn/EN/Y2013/V33/I1/187

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