Analysis of Dual-Polarization Radar Observations in Response to Warm Cloud Seeding by an Aircraft in Guangdong Province
In order to study the physical response of the cloud system and precipitation development to aircraft warm cloud seeding,based on the Gamma raindrop spectral parameter inversion scheme of du-al-polarization radar in Shanwei City and atmospheric environmental field detection data,the warm cloud catalytic process that was implemented in the northern area of Shanwei City,Guangdong Province on Au-gust 30,2020 is analyzed.The results indicate that this process was a convective precipitation process dominated by warm cloud precipitation at the edge of subtropical high in midsummer,characterized by weak synoptic-scale system forcing,unstable atmospheric stratification and insufficient water vapor.In the warm cloud stage of cumulus cloud development,the hygroscopic catalyst was introduced.After 16 min,the volume of warm cloud system began to enlarge,the average values of ZDR,KDP,rainwater con-tent and precipitation intensity all grew obviously.Moreover,the sizes and concentrations of drop parti-cles increased significantly.The average mass diameter(Dm)and the standardized parameter that repre-sented the raindrop number concentration(lgNW)increased by 10.3％and 39.5％,respectively,and the cloud system lasted for 1.5 hours.The hygroscopic cores first absorbed water vapor near the catalytic layer and grew into a large number of small cloud droplets,which were superimposed with the enhanced upward airflow accompanied by developing natural convection,enhancing the collision and merging process of cloud droplets.Many small raindrops were brought over the top of 0 ℃ layer by the updraft,which made the super cooled raindrops increase temporarily leading to the generation of graupel particles.
aircraft operationsresponse of warm cloud catalyticdual-polarization radarmicro-physical characteristics
万方数据
维普
