Localization and Evaluation of Precipitation Product Parameters of Wanning Dual Polarization Weather Radar

Cai Xingyao; Kuang Changwu; Zheng Pengbin; Guo Jia; Li Wen; Li Xun

doi:10.16765/j.cnki.1673-7148.2024.06.011

Abstract：In order to improve the accuracy of quantitative precipitation estimation of the dual polari-zation weather radar(CINRAD-SAD type)in Wanning,this study used the data of six ordinary precipita-tion and three typhoon precipitation processes in 2022 from three weather phenomenon meters(WUSH-PW model)which were installed within the detection radius of the Wanning radar.The parameters ZH,ZDR and KDP of Wanning radar were simulated by means of non-spherical particle scattering model(T-Ma-trix),and then the localized parameters of the precipitation estimation formula were fitted by the least square method.The 1 h radar quantitative precipitation estimation products(OHP)using default parame-ters and localized parameters were evaluated in general.Besides,fractional precipitation evaluation and fractional distance evaluation were carried out for the OHP as well.Moreover,the precipitation product corrected by the rain gauge was also evaluated in general.The results show that:(1)The accuracy of OHP estimation is improved by 29.66％(OHP single polarization No.78)and 14.47％(OHP double polarization No.169)using localized parameters compared with using default parameters.(2)Relative to the default parameters,the estimation accuracy of localized parameters in each precipitation level is im-proved by 36.82％at most.(3)Compared to the default parameters,the estimation accuracy of localized parameters in all distance segments is improved by up to 32.33％.(4)The accuracy rate of the localized parameter precipitation products after rain gauge correction exceeds 90.00％,and the average deviation ratio is close to 1,so this can be used as the true value of precipitation.