海口地区GPS反演大气可降水量中加权平均温度模型构建及其应用  

Construction of weighted mean temperature model in retrieval of atmospheric precipitable water from GPS in Haikou and its application

作　　者：李光伟[1,2] 黄光瑞 邢峰华[1] 敖杰 LI Guangwei;HUANG Guangrui;XING Fenghua;AO Jie(Hainan Institute of Meteorological Science,Haikou 570203,China;Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province,Haikou 570203,China)

机构地区：[1]海南省气象科学研究所,海南海口570203 [2]海南省南海气象防灾减灾重点实验室,海南海口570203

出　　处：《干旱气象》2022年第6期1081-1091,共11页Journal of Arid Meteorology

基　　金：海南省自然科学基金项目(420RC754);海南省重点研发计划项目(ZDYF2021SHFZ062)共同资助。

摘　　要：地基GPS反演大气可降水量(precipitable water,PW)中,加权平均温度(Tm)是一个非常重要的参数。为提高海南岛PW反演的精度和可靠性,基于海口站2008—2010年探空数据计算的Tm,分析Tm时间变化特征及其与地面气象要素的关系,在此基础上利用2008—2012年数据建立Tm单因子、多因子回归模型和加入年积日的回归模型,并利用2013—2014年数据对模型进行检验。进一步基于2012年5—10月数据对基于Tm单因子和多因子模型的GPS反演PW进行检验。结果表明:本地化单因子、两因子Tm模型均方根误差分别为2.000和1.978 K,与Bevis公式、常数法相比,本地模型误差较小,与探空资料计算的Tm有良好的一致性。与Bevis模型相比,基于本地单因子和多因子Tm模型的GPS反演PW与探空资料计算的PW相关性更高,偏差更小;与多因子线性模型相比,基于加入年积日的Tm模型的GPS反演PW精度明显提高。本地化Tm模型能更好满足海口地区地基GPS反演PW。Weighted mean temperature(Tm)is a key parameter in the retrieval of atmospheric precipitable water(PW)from ground-based Global Positioning System(GPS).In order to improve the accuracy and reliability of the retrieval of PW in Hainan Island,tempo⁃ral variation characteristics of Tm calculated based on Haikou radiosonde data during 2008-2010 and the relation with meteorological factors at Haikou station are analyzed.On this basis,based on radiosonde and surface observation data during 2008-2012,single-factor and multi-factor Tm regression equations and Tm regression models with day of year factor are established at Haikou,and the models are validated by using radiosonde and surface observation data during 2013-2014.Based on the local Tm regression models,the ground-based GPS PW retrieval of Haikou is performed from May to October 2012,and the retrieval accuracy is verified.The results show that:by comparison of the true Tm,the RMSE of single-factor and two-factor local Tm models are 2.000 and 1.978 K,superior to Bevis and constant model.The local model of Tm has good consistency with Tm calculated by radiosonde data.The GPS PW from single-factor Tm model exhibits much stronger correlations with radiosonde PW than GPS PW based on Bevis model,and the RMSE of GPS PW by single-factor Tm model is lower than that based on Bevis model.Compared with the multi-factor linear Tm model,GPS PW based on the Tm model with day of year factor has significantly improved accuracy.The local models could meet the accuracy requirements of the PW from ground-based GPS data of Haikou.

关 键 词：大气可降水量 加权平均温度 地基GPS 多元回归 海口 

分 类 号：P426[天文地球—大气科学及气象学]