干旱区研究2017，Vol.34Issue(3)：575-584,10.DOI:10.13866/j.azr.2017.03.13
JICA项目地基GPS大气可降水量资料精度检验
Accuracy Test of JICA Project Ground-Based GPS Precipitable Water Vapor
摘要
Abstract
A project from the Japan International Cooperation Agency (JICA) was carried out during the period from 2005 to 2009,in which 24 ground-based GPS stations were established in the Tibetan Plateau and its peripheral regions.In this paper, the GPS-retrieved precipitable water vapor data (GPS-PWV) of JICA during the period from 2011 to 2012 were compared with the PWV values calculated by radiosonde (RS-PWV) at 0:00 and 12:00UTC,the accuracy of GPS-PWV data of JICA project was tested,and the error variations and the influences of temperature were analyzed.The results are as follows:① Daily variations of GPS-PWV and RS-PWV were consistent and passed the significant test of 0.001, but the GPS-PWV was higher because of the lower altitudes of the GPS stations.The correlation coefficients were increased with the decrease of altitude;② The average RMSE (MRE) between GPS and radiosonde PWV was 0.23-0.33 cm (9.13％-29.01％),and the RMSE (MRE) was generally increased (decreased) with the decrease of altitude;③ There was an obvious seasonal difference in the PWV variation and the bias of PWV:the maximum value occurred during the period from July to September, and the low value from December to next March.④ The peak center of frequency distribution of PWV bias at 0:00 UTC was located at 0 cm, and the PWV biases were mainly concentrated between-0.1 and 0.1 cm.The peak center at 12:00 UTC moved rightward, the maximum was lower, and the distribution was scattered;⑤ In a certain temperature range,the PWV bias was increased to some extent with the temperature increase.关键词
地基GPS/探空观测/大气可降水量/精度检验Key words
ground-based GPS/radiosonde observation/precipitable water vapor/accuracy test引用本文复制引用
马思琪,周顺武,王毅勇,孙绩华..JICA项目地基GPS大气可降水量资料精度检验[J].干旱区研究,2017,34(3):575-584,10.基金项目
国家自然科学基金项目(41275095) （41275095）
宁夏气象防灾减灾重点实验室开放研究基金 （）
科技部公益性行业(气象)科研专项(GY-HY201406054,GYHY201406001) （气象）
国家重点研发计划课题(2016YFA0602003)资助 （2016YFA0602003）
