摘要
采用线性回归和最小二乘法拟合建立无线电探空可降水量(RS-PWV)与GPS对流层延迟(GPS-ZTD)、地面温度及大气压之间的直接转换模型,并将直接转换模型得到的PWV分别与RS-PWV及GPS反演得到的可降水量(GPS-PWV)进行比较。结果表明,RS-PWV与GPS-ZTD之间存在良好的线性关系,相关系数达0.927 6;RS-PWV与4阶拟合温度和大气压呈现较好的相关性,相关系数分别为0.640 1和-0.626 3;基于ZTD的单阶单因子模型PWV与GPS-PWV的相关系数达到0.969 9;基于ZTD、温度及大气压的单阶多因子模型PWV比基于ZTD的单阶单因子模型PWV精度明显提高,RMS从4.3 mm提高到3.3 mm。
There are problems in calculating conventional GPS precipitable water vapor(GPS-PWV),including the large amount of data,low efficiency,and many introduced observation errors.Based on the radiosonde and GPS data collected at Chenzhou CORS station in 2015 and using linear regression and least squares methods,a new direct conversion PWV model is established from radiosonde-derived PWV(RS-PWV),GPS tropospheric delay(GPS-ZTD),ground temperature and atmospheric pressure.The direct conversion PWV model is compared with RS-PWV and GPS-PWV respectively to verify accuracy and reliability.The correlation analysis shows a favorable linear relationship between RS-PWV and GPS-ZTD,with the correlation coefficient reaching 0.927 6.The RS-PWV has positive and negative correlation with the 4-order fitting temperature and atmospheric pressure;their correlation coefficient reaches 0.640 1 and-0.626 3 respectively.The correlation coefficient between single-order single-factor model PWV based on ZTD and GPS-PWV is 0.969 9,which shows the feasibility of directly calculating PWV from ZTD.The accuracy of single-order multi-factor model based on ZTD,temperature and atmospheric pressure is significantly higher than that of single-order single-factor model based on ZTD,and RMS is increased from 4.3 mm to 3.3 mm.Therefore,the accuracy of direct conversion PWV model is slightly lower than that of GPS-PWV,but it simplifies computation and improves efficiency.
作者
李黎
宋越
易金花
田莹
周嘉陵
LI Li;SONG Yue;YI Jinhua;TIAN Ying;ZHOU Jialing(School of Environmental Science and Engineering,Suzhou University of Science and Technology,1 KeruiRoad,Suzhou 215009,China;School of Resource Environment and Safety Engineering,Hunan University of Science and Technology,Taoyuan Road,Xiangtan 411201,China;Shandong Meteorology Bureau,12 Wuyingshan Road,Ji’nan 250031,China;Jiangsu Institute of Meteorological Sciences,16 Kunlun Road,Nanjing 210009,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2019年第5期492-495,501,共5页
Journal of Geodesy and Geodynamics
基金
湖南省自然科学基金(2016JJ3061
2017JJ2149)
国家自然科学基金(41304029)
江苏省自然科学基金(BK20161603)
山东省气象局科技项目(2017SDQXM01)
江苏省"333工程"培养基金(BRA2015537)~~
关键词
地基GPS气象学
天顶对流层延迟
可降水量
直接转换模型
ground-based GPS meteorology
zenith tropospheric delay
precipitable water vapor
direct conversion model
