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《Meteorological Monthly》 2007-07
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A Study of the Feature of Water Resources in Spring Precipitating Stratiform Clouds in Henan Province

Shao Yang Zheng Guoguang(Key Laboratory for Cloud Physics and Weather Modification of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081)  
The feature of water resources in precipitating stratiform clouds during March 20-21, 2005 in Henan Province was studied using ARPS model. Vapor inflow and outflow, microphysical conversion of water substance in clouds, and precipitation efficiency were simulated. The model simulation declared that plentiful vapor inflow provided a favorable condition for the formation and development of clouds. The inflow of vapor in the Henan region was mostly horizontal with weak contribution from surface evaporation. The main vapor inflow exists in the southern and western sides of Henan with the strongest inflow at about the height of 2 km, whereas the eastern and northern sides are main vapor outflow. The average height of 0℃ layer is about 2.5km. The clouds have a distinct vertically-layered structure with ice cloud above 6 km, water-ice mixed cloud between 2.5~6km, and liquid cloud below 2.5km, which accords with the “seeder-feeder” cloud structure. The horizontal flow of hydrometeor was weaker compared with the vapor flow. The growth of precipitating ice particles mainly occurs at about the height of 4km, and that of rain droplets at about the height of 2.5km, where is near the zero temperature level. The temporal change of regional hourly precipitation efficiency is consistent with surface hourly precipitation with a distinct lag behind the vapor inflow. During strong precipitation, regional hourly precipitation efficiency is 20%~30%. The distribution of regional precipitation efficiency is consistent with total precipitation with higher value in the southern Henan and lower value in the north.
【Fund】: “十五”国家科技攻关计划《人工增雨技术研究及示范》(2001BA610A-06/2004BA610-04)
【CateGory Index】: P426.6
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