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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (5): 1461-1472    DOI: 10.7522/j.issn.1000-694X.2013.00212
Weather and Climate     
The Influence of High Level Jet on Dust Transportation in a Sandstorm Process
DUAN Hai-xia1, LI Yao-hui1, PU Zhao-xia1,2, ZHAO Jian-hua1, ZHANG Liang1
1.Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Climatic Change and Disaster Reduction of China Meteorological Administration, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;
2.Department of Atmospheric Sciences, University of Utah, Salt Lake City 84112, Utah, USA
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Abstract  

Through the simulations of GRAPES_SDM sandstorm model to a strong sandstorm process in north of China during April 28-30 in 2011, the influence of High-Level Jet on dust transportation was analyzed. It was showed that: (1) The GRAPES_SDM model simulated successfully the range and center of the sandstorm process, the total simulation effect was good. (2) The occurrence time and movement path of sand weather were in accordance with the increase and movement of High-Level Jet at 200 hPa. (3) The increase of strong zonal wind speed in high level could brought about the development of vertical circulation cell in mid-low level, and the sinking branch of the circulation cell brought the high-level momentum to near surface, and then the strong wind, sand-blowing and sandstorm appeared. The center of strong sandstorm was at the sinking branch of the vertical circulation cell. (4) The path to underneath of high value region of potential vorticity was coincident relatively with the isoline dense zone of zonal wind in the north of High-Level Jet. Through the analysis on the dynamical and thermal vertical cross-section along High-Level Jet axes, we also discussed the probable mechanism of the influence of High-Level Jet on large range sand weather.

Key words:  strong sandstorm process      High-Level Jet      GRAPES_SDM model      momentum transportation downward     
Received:  17 August 2012      Published:  17 December 2012
ZTFLH:  P425.55  

Cite this article: 

DUAN Hai-xia1, LI Yao-hui1, PU Zhao-xia1,2, ZHAO Jian-hua1, ZHANG Liang1. The Influence of High Level Jet on Dust Transportation in a Sandstorm Process. JOURNAL OF DESERT RESEARCH, 2013, 33(5): 1461-1472.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00212     OR     http://www.desert.ac.cn/EN/Y2013/V33/I5/1461

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