摘要
为提高万宁双偏振天气雷达(CINRAD-SAD型)定量降水估测产品的准确性,使用万宁雷达探测半径内3部天气现象仪(WUSH-PW型)在2022年6次普通降水和3次台风降水的数据资料,采用非球形粒子的散射模型(T-Matrix)对万宁雷达的参量Z_(H)、Z_(DR)、K_(DP)进行了模拟,最后用最小二乘法拟合出了降水估测公式的本地化参数。分别对使用默认参数和本地化参数的1 h雷达定量降水估测产品(OHP)进行了总体评估、分降水量评估、分距离评估,还对使用雨量计订正后的降水产品进行了总体评估。评估结果表明:(1)使用本地化参数比默认参数计算得到OHP估测准确率提高了29.66%(OHP单偏振78号产品)和14.47%(OHP双偏振169号产品)。(2)使用本地化参数比默认参数在各个降水量级的估测准确率均有所提高,最多提高了36.82%。(3)使用本地化参数比默认参数在各个距离段的估测准确率均有所提高,最多提高了32.33%。(4)经雨量计订正后的本地化参数降水产品准确率均达到了90.00%以上,平均偏差比接近1,可作为降水真值使用。
In order to improve the accuracy of quantitative precipitation estimation of the dual polarization weather radar(CINRAD-SAD type)in Wanning,this study used the data of six ordinary precipitation and three typhoon precipitation processes in 2022 from three weather phenomenon meters(WUSHPW model)which were installed within the detection radius of the Wanning radar.The parameters Z_(H),Z_(DR)and K_(DP)of Wanning radar were simulated by means of non-spherical particle scattering model(T-Matrix),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 parameters 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 improved 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.
作者
蔡杏尧
匡昌武
郑鹏斌
郭佳
李文
李勋
Cai Xingyao;Kuang Changwu;Zheng Pengbin;Guo Jia;Li Wen;Li Xun(Hainan Meteorological Observation Center,Haikou 570203,China;Hainan Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation,Haikou 570203,China;Beijing Metstar Radar Co.Ltd.,Beijing 100085,China;Haikou Meteorological Bureau,Haikou 570203,China;Hainan Meteorological Observatory,Haikou 570203,China)
出处
《气象与环境科学》
2024年第6期92-99,共8页
Meteorological and Environmental Sciences
基金
海南省重点研发项目(ZDYF2023SHFZ125)
海南省气象局2022年科研项目(HNQXJS202206)。
关键词
双偏振雷达
T-MATRIX
本地化参数
定量降水估测
雨量计订正
dual polarization radar
T-Matrix
localized parameter
quantitative precipitation estimation
rain gauge correction
