Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2017, Vol. 33 ›› Issue (3): 126-134.doi: 10.11924/j.issn.1000-6850.casb16030185

Special Issue: 农业气象

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Evolution of Microphysical Characteristic Parameters of Stratiform Mixed Clouds in Summer and Artificial Precipitation Enhancement

  

  • Received:2016-03-25 Revised:2017-01-05 Accepted:2016-06-15 Online:2017-02-10 Published:2017-02-10

Abstract: The paper aims to make better use of microphysical characteristic parameters inversed by FY-2C/D satellite data in weather modification operation, the characteristics of cloud system evolution, artificial precipitation enhancement and cloud seeding effect were analyzed by using the data of radar, satellite, airborne cloud physical detection platform at mixed convective stratiform cloud precipitation process in August 17-19, 2010, in Shanxi. The results showed that: the cloud maintain time was 35 hours, the clouds continued thickening, the cloud particle effective radius (Re) was stable and had little change, the precipitation was less, the natural precipitation of cloud system was weaker, with good potential for precipitation enhancement during the day and into the night of August 17. In the daytime, the cloud top temperature was -10℃, the cloud droplet effective radius was less than 12 μm, the clouds were dense, the cloud water content was abundant, and the large particles and ice content were fewer. In night, under the high cloud seeding effect, there was heavy precipitation; sustained and stable low stratiform clouds were better for precipitation enhancement operation. Comprehensive analysis showed that the satellite criterion which was suitable for artificial precipitation enhancement of laminated hybrid cloud precipitation in summer was: cloud thickness greater than 2 km, cloud top temperature of -10- -20℃, and genting cloud effective particle radius less than 15 μm.