The Contribution of Soil Moisture to Dust Storm in Western and Central Inner Mongolia, China

doi:10.11867/j.issn.1001-8166.2005.01.0024

Advances in Earth Science ›› 2005, Vol. 20 ›› Issue (1): 24-028. doi: 10.11867/j.issn.1001-8166.2005.01.0024

Special Issue: “沙尘天气追因、影响及治理”虚拟专刊；

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The Contribution of Soil Moisture to Dust Storm in Western and Central Inner Mongolia, China

LI Zhangjun ^1，2，LI Ning ^3，4，GU Wei ^4，5，WU Xuehong ^1,2

1. Nanjing Information Engineering University, Jiangsu Nanjing 210044, China;
2. Weather Station of Autonomous Region of Inner Mongolia, Inner Mongolia, Huhhot 010051, China;
3. Institute of Disaster and Public Security,College of Resources Sciences and Technology, Beijing Normal University, Beijing 100875,China; 
4.Resources Technology and Engineering, College of ResourcesSciences and Technology, Beijing Normal University, Beijing 100875,China;
5.Key Laboratory of Environmental Changes and Natural Disaster of Ministry of Education, Beijing Normal University, Beijing 100875, China

Received:2003-11-14 Revised:2004-05-01 Online:2005-01-25 Published:2005-01-25

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LI Zhangjun，LI Ning，GU Wei，WU Xuehong. The Contribution of Soil Moisture to Dust Storm in Western and Central Inner Mongolia, China[J]. Advances in Earth Science, 2005, 20(1): 24-028.

To recuperate the shortage of soil moisture, based on hourly soil moisture date observed from April 2001 to June 2003 in western and central Inner Mongolia of China, the change regulation of daily mean soil moisture and daily mean wind speed and their integrative contributions are analyzed in the paper. Then rationality of the statistic result is discussed, from which some interesting results can be drawn as follows: (1）The minimum value of daily mean wind speed for dust storm emission is 3.5m/s, and dust storm will occur when the wind speed over 8m/s in this area. (2）There are 18.4% of dust storms that occurred and 81.6% of non-dust storms that occurred in the total data collected when the wind speed was more than 3.5m/s. It indicated that dynamical factor with daily mean wind speed is not a most important one in the factors of dust storm emission. (3）If only soil moisture and wind speed are consider, when there is a inverse relation between daily mean soil moisture and daily mean wind speed, dust storm would occurred (r= 0.674). Otherwise, if their relation were not shown as this inverse, dust storm would not occur. The formation and development of dust storm is an integrative result of soil moisture and wind speed. Continuous data of soil moisture would be an avail index to study dust storm for showing the humid status of soil directly and for scaling the status of vegetation cover indirectly.

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