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JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (6): 1210-1218.DOI: 10.7522/j.issn.1000-694X.2016.00058

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Influence of Underlying Surface on Dust Weatherin the Entrance of the Hexi Corridor

Li Danhua1,2, Long Xiao1, Wen Xiaopei1,3, Jiang Yin1, Meng Xiaowen1   

  1. 1. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;
    2. Northwest Regional Climate Center, Lanzhou 730020, China;
    3. Shandong Provincial Institute of Meteorology, Jinan 250031, China
  • Received:2016-04-08 Revised:2016-05-16 Online:2017-11-20 Published:2017-11-20

Abstract: Based on the analysis of wind speed distribution characteristics in spring during 2000-2011 and the dust weather years in the entrance of Hexi Corridor by usingmeteorological data. Using Regional climate model (Regcm4.3.5.6)and European Center Update 4DVar assimilated ERA-interim data, we analyzed the influence of the change of vegetation cover in the entrance of Hexi Corridor during a dust weather on April 13, 2007.The result shows during the sandstorm outbreak, the Hexi Corridor is a large area of wind speed, and the wind speed is 8-10 m·s-1; The dust characteristics of the regional climate model simulation are compared with the dust weather distribution observed by the site, the development of simulated sand dust zone can better describe the change of dust weather process; The surface cover in the entrance area of Hexi corridor is changed from desert to deciduous coniferous forest. When sand dust weather occurs, the wind speed in this area decreases, and the magnitude decreases by an average of 3 m·s-1 and it's obvious for larger wind speed. The influence of surface cover change on different particle sizes is different, and the largest reduction of dust emission rate and column content reaches -50 mg·m-2·d-1, -50 mg·m-2, and it has similar characters of reduction for 0.01-5.0 μm; The reduction of 5.0-20 μm is the most obvious due to the largest particle size, the decrement of dust emission rate and burden is significant when the duststorm reached its strongest phase.

Key words: dust weather, Hexi Corridor, surface cover change, sand emission rate, sand column content

CLC Number: