Observation And Research On The Evolution Characteristics Of Hail Embryos In Weining, Guizhou Based On X-band Dual Polarization Radar

In order to explore the evolution characteristics of hail embryo particles during the hailstorm in Weining area,the quality of the X-band dual-polarization radar data input is processed.After comparison,five filtering methods(median filtering,moving average,Kalman filtering,FIR)Iterative filtering,integrated wavelet denoising),the overall effect of integrated wavelet denoising in retaining the original?_Caverage trend and details and smoothing the original?_Cradial distance profile is better than the other four methods,in the K_DPAmong the two methods,the least square method is also better than the direct derivative method.After unfolding,filtering,and adaptive attenuation correction,Barnes interpolation method is used to interpolate the polarization parameters,and the fuzzy logic algorithm is used to hydrate the particles.Identification and systematic analysis of two typical hailstorms in Weining County.The following conclusions were obtained:(1)The sources of high-density graupel were polymers and frozen drops during the two processes,and the sources of low-density graupel particles were ice crystal;high-density graupel particles contributed the most to hail production during the single hail storm.The low-density graupel particles contributed the most to hail during the multi-cell hailstorm.(2)In a multi-cell hailstorm,the high-altitude convergence and low-level divergence of the attenuating cell can promote the formation of hail embryos.(3)Before the hailfal for singel hailstorm:The number of low-density graupel particles is almost unchanged;high-density graupel particles consume more supercooled water particles due to the increase in polymers,and some of the high-density graupel particles fall to the ground.Causes the number of high-density graupel particles to decrease,the rate of change is-10 pools per minute(the number of pools of aqueous particles in the particle recognition result of the cloud body);during hailfall:High-density graupel particles attach to supercooled water particles and then grow to form hail,resulting in a decrease in high-density graupel particles with a rate of change of-12.1 pools per minute;and under the“Begillon process”and the adhesion of the aggregation,the low-density graupel particles increased rapidly,with a rate of change of 36 cells per minute;hail After:Low-density graupel particles fall,and the number decreases rapidly,with a rate of change of-36.6 pools per minute;during the decline process,low-density graupel particles that are attached to supercooled water,polymers,etc.are converted into high-density graupel particles,resulting in high-density graupel particles.The total amount is almost constant,with a rate of change of 2 pools per minute.(4)Multi-cell hailstorms are similar to single-cell hailstorms before the haifall,except that the development speed,number of hail embryos,and echo intensity of the single-cell hailstorm are higher than that of the single-cell hailstorm under the promotion of dissipating cells;During hailfall:low-density graupel particles attach to supercooled water droplets to form hail during the falling process,resulting in a rapid decrease in the number of-62.6 pools per minute;high-density graupel particles increase in the rate of 16.5 pools;The time to hailfall is about 15 minute longer than a single hailstorm;it is similar to a single hailstorm after the haifall.a preliminary study is made on the evolution characteristics of hail embryos during each hailstorm process,and a single,multi-cell hailstorm is established.Conceptual model,which has high application value for hail warning,forecast and artificial hail removal.