利用IGRA2探空数据和COSMIC掩星资料对FY-3C掩星中性大气产品进行质量分析  

Quality Analysis of the Neutral Atmospheric Products from FY-3C Radio Occultation Based on IGRA2 Radiosonde Data and COSMIC Radio Occulation Products

作　　者：徐晓华[1,2] 朱洲宗 罗佳 XU Xiaohua;ZHU Zhouzong;LUO Jia(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;Collaborative Innovation Center of Geospatial Technology,Wuhan 430079,China;Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]地球空间信息技术协同创新中心,湖北武汉430079 [3]地球空间环境与大地测量教育部重点实验室,湖北武汉430079

出　　处：《武汉大学学报（信息科学版）》2020年第3期384-393,共10页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41774033,41774032);国家重点基础研究发展计划(973计划)(2013CB733302);国家重点研发计划(2018YFC1503502).

摘　　要：根据IGRA2无线电探空数据和气象、电离层和气候卫星联合观测系统(Constellation Observing System for Meteorology Ionosphere and Climate,COSMIC)掩星资料,对2015—2017年包含折射率、温度和比湿廓线在内的FY-3C掩星中性大气产品进行质量分析。结果表明:FY-3C掩星折射率廓线25 km以下整体无系统偏差,相对偏差标准差≤5%;温度廓线存在系统负偏差,标准差≥1.5 K;比湿廓线越趋地表质量越低,5 km下标准差≤1.2 g/kg。总体而言,FY-3C掩星数据质量较好,在2015—2017年间逐年提高,但在近地面和25km以上有待进一步提高。对2017年产品的进一步分析表明:就季节而言,折射率廓线和温度廓线质量均在冬季最差,比湿廓线质量在夏季最差;就纬度带而言,折射率廓线在低纬度带质量最差,温度廓线质量的分纬度带比较结果在不同高度范围存在差异,比湿廓线在低纬度带质量明显低于中高纬度带;此外,FY-3C掩星大气产品数据质量随昼夜和海陆变化也存在一定差异。Based on the IGRA2 radiosonde data and the COSMIC(Constellation Observing System for Meteorology Ionosphere and Climate)radio occulation(RO)products,the quality analysis of the neutral atmospheric products from FY-3 C RO observations,including the refractivity,the temperature and the specific humidity profiles,during 2015 to 2017 is carried out.The results show that below 25 km,there are no systematic negative deviations in FY-3 C RO temperature profiles and the standard deviation of the relative deviation is smaller than 5.0%.Systematic negative deviations in temperature profiles exist,and the standard deviation is more than 1.5 K.The quality of specific humidity profiles is poorer when the height approaches the ground more closely,and the standard deviation is smaller than 1.2 g/kg.Although the FY-3 C RO data is generally of high quality and the quality is higher and higher from 2015 to 2017,it needs to be further improved near the ground and above 25 km.The further analysis based on the products during 2017 shows that the qualities of the FY-3 C RO refractivity profiles and temperature profiles are the worst in winter,while the qualities of the FY-3 C RO specific humidity profiles are the worst in summer.The qualities of the FY-3 C RO refractivity profiles are the worst in the low latitudes,while the altitudinal dependencies of the qualities of FY-3 C RO temperature profiles are not the same at different altitude ranges,and the FY-3 C specific humidity profiles are significantly worse in the low latitudes than in the middle latitudes.In addition,day and night differences and land and sea differences also exist in the qualities of FY-3 C RO products.

关 键 词：FY-3C 掩星 中性大气产品 质量分析 

分 类 号：P412.27[天文地球—大气科学及气象学]