Characteristics of Precipitation Echoes and Conditions for Rocket Precipitation Enhancement Operations in Northwest Fujian
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Abstract:
The cloud and precipitation resources, weather systems propitious to precipitation enhancement operations, precipitation echo characteristics, and indexes of precipitation enhancement operations in Northwest Fujian are analyzed, based on the CINRAD radar echo images, 850 hPa synoptic charts and surface precipitation data from 299 weather processes from May 2005 to July 2007. The results show that the chief weather systems propitious to precipitation enhancement operations include continental high, subtropical anticyclone, warmsector convergence, tropical convergence, the other, trough, typhoon (low pressure), low vortex, and low vortex shear, respectively. Stratuscumulus mixed clouds were the primary objects of local precipitation enhancement operation. For cumuliform clouds and stratuscumulus mixed clouds, the larger the echo height and area were, the higher the corresponding precipitation grade was. The echo intensity and the depth of negative temperature layer of stratuscumulus mixed clouds had great effects on precipitation grade. The indexes of rocket precipitation enhancement operations in Northwest Fujian were: the echo intensity of cumuliform clouds and stratuscumulus mixed clouds should be larger than 30 and 25 dBz, the echo top should be higher than 5500 and 5000 meters, the depth of negative temperature layer should be larger than 1500 and 2000 meters, the echo area should be larger than 1000 and 2500 square kilometers, the vertically integrated liquid water should be more than 1 kg〖DK〗·m-2 , and the cloud top temperature of nephsystem should range from -28 ℃ to -12 ℃, respectively.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.