Application Analysis of C-band Dual Polarization Radar Data in a Strong Convection Weather in Henan County
Based on Huangnan C-band dual polarization radar detection data on August 3,2023,the short-term heavy precipitation process in Henan County was analyzed through characteristics from the radar intensity products,velocity products,polarization products and quantitative precipitation estimated product.The results show that:(1)In Henan region before the precipitation,the CR was above 50dBZ,with the VIL around 10kg/m2,the TOPS around 10km,and the HT around 2km.After the precipitation,the echo intensity either increased or was maintained at 50dBZ,which was considered indicative of short-term heavy rainfall.(2)The convergence zone maintenance period of the radial velocity corresponds to the strongest period of the precipitation.The"bow"feature of the zero velocity line on the velocity chart could be used as a sign of the long duration of the precipitation.(3)The upper wind field of VWP products changed from discontinuous to continuous,which had a good indicator significance for the occurrence of short-term heavy precipitation.(4)30-60 minutes before the onset of short-time heavy precipitation,a CC value greater than 0.97 indicated that the precipitation phase was pure rain,and large value of Zc corresponding to large value of ZDR and KDP indicated that the raindrops size and raindrop particle density were large,which made it likely to produce short-time heavy precipitation exceeding 20mm/h.(5)The nearer the actual precipitation region to the radar,the more closely the precipitation area depicted in the OHP product aligns with the actual location,but the precipitation estimate was greater than the actual precipitation.The precipitation area and amount of THP products have certain deviations from the actual situation,and further analysis and summary are needed to condense corresponding indicators with reference significance.The analysis results of this paper can provide a reference for similar short-term nowcasting and have good business application value.
Dual-polarimetric radarHenan CountyShort-term heavy precipitation
万方数据
维普
