| 天气与气候 |
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| Effects of Surface Heating Flux on the Numerical Simulation Results of Dust Storm |
| JIANG Xue-gong1, LI Zhang-jun1, CHENG Cong-lan2, HU Ying-hua1, ZHANG Bo-yu1, ZHAO Shu-hui3 |
| 1.Inner Mongolia Autonomous Region Meteorological Observatory, Hohhot 010051, China; 2.Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China; 3.Inner Mongolia Autonomous Region Meteorological Informational Center, Hohhot 010051, China |
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Abstract A dusty weather numerical prediction model was used to simulate the effects of the surface heating flux on the dust storm. The case is a super severe dust storm process occurred in eastern Asia from Mar. 18 to Mar. 20, 2002. This dust storm process was successfully simulated by the model. The simulated dusty weather regions corresponded to the observational regions. But the simulated intensity of surface heating in daytime and the surface cooling at night was overrated. In the desert region of Inner Mongolia the surface sensitive heating flux brought a net heating to the atmosphere. The surface heating flux enhanced the intensity of dust storm. Meanwhile, it enhanced the daily change of intensity of dust storm seriously through enhancing the daily change of surface wind speed, the stratification instability in lower atmosphere and the surface friction velocity. The main mechanism of surface heating flux influencing the surface wind speed is that it can lead a mixed layer (ML) in the lower atmosphere and so the downward transportation of momentum was enhanced. Through this mechanism the strength of surface wind speed and the friction velocity are enhanced. In addition, the advection of air in ML contributed to the sustaining and expanding of ML. The influencing process of surface heating flux can be divided to two phases. In the dust storm formation phase, the surface heat flux mainly affected the weather elements in the PBL(planetary boundary layer) and at surface, such as the surface wind speed, the stratification stability and surface friction velocity discussed above. In the second phase, the surface heating flux enhanced the ascending motion from the lower troposphere up to the middle troposphere according with the time processing. This influence can touch the height above 500 hPa.
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Received: 15 October 2008
Published: 20 January 2010
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2010, Vol. 30 
