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《Meteorological Monthly》 2009-06
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A Numerical Study of Effects of Mineral Dust Particles on Cloud and Precipitation in the Northwest China

Kang Fengqin1 Yin Yan2 Zhang Yixuan1(1.Gansu Province Artificial Modification Office,Lanzhou 730020;2. Nanjing University of Information and Science Technology,Jiangsu Key Laboratory of Meteorological Disaster)  
Previous studies show that the arid and semi-arid regions of North China serve as one of the principal sources of tropospheric dusts.The possible impacts of the aerosol concentration upon the formation and development of mixed clouds in the condition of different dry atmosphere was discussed based on the modeling simulation.The factorial analysis method was used to identify impacts of the major and minor factors.The evidence suggests that(1) increase in sand aerosols would lead to reducing precipitation,suppressing hail particle genesis,prolonging the existence of clouds and altering their space structure and microscopic features;(2) factorial analysis shows that in the arid and semi-arid climate the accumulated rainfall from mixed clouds is more sensitive to the change in the number concentration of aerosols than to that in atmosphere moisture;(3) the augmentation of the number concentration would reduce accumulated precipitation;(4) increase of atmospheric humidity would be responsible for more accumulated rainfall.The presented results can be employed to account for the observational fact of the reduced number of hailfall days during a dry period of North China.
【Fund】: 国家重点研究发展计划(973)项目(2006CB403706);; 中国气象局气象新技术推广项目(CMATG2007Z08);; 江苏省高校自然科学基础研究项目06KJB170047
【CateGory Index】: X513
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