风云三号双星联合反演日平均OLR能力评估  

Evaluation of daily mean OLR by combining FY-3 dual-satellites

作　　者：张婉春 刘健 徐娜[1,2,3] 陈林[1,2,3] 徐寒列 ZHANG Wanchun;LIU Jian;XU Na;CHEN Lin;XU Hanlie(Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites,Beijing 100081,China;Fengyun Meteorological Satellite Innovation Center,Beijing 100081,China;National Satellite Meteorological Center,Beijing 100081,China)

机构地区：[1]中国气象局中国遥感卫星辐射测量和定标重点开放实验室,北京100081 [2]许健民气象卫星创新中心,北京100081 [3]国家卫星气象中心,北京100081

出　　处：《遥感学报》2024年第10期2600-2610,共11页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家重点研发计划(编号:2021YFC2803300,2021YFC2803303);风云卫星应用先行计划项目(编号:FY-APP-2021.0505)。

摘　　要：大气顶射出长波辐射(OLR)是大气顶辐射能量平衡的重要分量。风云三号D星和E星(FY-3D和FY-3E)上搭载的中分辨率成像光谱仪(MERSI)均可用于OLR反演。为研究日变化特征对OLR日平均精度的影响,基于美国Aqua CERES OLR瞬时观测数据,采用等经纬度投影匹配统计方法,分别对FY-3D和FY-3E MERSI瞬时OLR反演精度进行一致性比对。结果表明:两颗星OLR反演精度基本一致,FY-3D和FY-3E MERSI OLR与Aqua CERES OLR相比,RMSE均在6—7 W/m^(2);相比于单颗星每日两次计算的日平均OLR,基于两颗卫星每日四次观测计算的日平均OLR的精度提高3—4 W/m^(2)。因此,利用两颗极轨气象卫星观测数据,可更精确地反映OLR日变化特征。The Outgoing Longwave Radiation(OLR)of the top of the atmosphere is an important component of radiation energy balance.The FY-3D and FY-3E polar-orbiting meteorological satellites,launched in November 2017 and July 2021 respectively,carry the medium resolution spectral imager(MERSI)II and low light instruments.Both instruments can retrieve OLR using two water vapor channels and two window channels.In this study,on the basis of the introduction of the MERSI OLR inversion algorithm of the Fengyun satellite,the instantaneous OLR retrieval accuracy of FY-3D and FY-3E MERSI is compared by using the instantaneous observation data of Aqua CERES OLR.Comparison results show that the instantaneous OLR retrieval accuracy of FY-3D and FY-3E is basically the same as the instantaneous OLR data of Aqua CERES.The Root Mean Square Error(RMSE)of FY-3D and FY-3E MERSI OLR is between 6 and 7 W/m^(2)compared with that of Aqua CERES OLR.This result reflects that although the performance of the MERSI instruments of the FY-3D and FY-3E satellites have differences,the OLR retrieval capabilities of the two satellites are comparable.The comparison results of the daily average OLR data based on CERES between the single and joint calculations of FY-3D and FY-3E show that the daily average OLR calculated on the basis of the four times of the two satellites per day is 3—4 W/m^(2) higher than that calculated twice a day for a single satellite.The global daily average OLR data from June to December 2022 were selected as an example.Compared with the daily average OLR of CERES,the daily average OLR obtained by two FY-3 satellites is remarkably improved in comparison with the RMSE of the daily average OLR calculated by a single satellite.This result shows that the daily observation data of multiple polar-orbiting meteorological satellites can reflect the diurnal variation characteristics of OLR well.The comparison involves the spatiotemporal matching of data,reprojection,and resampling schemes affects the validation results.Compared with CERES,th

关 键 词：风云三号 多星联合 大气顶射出长波辐射 日变化 中分辨率成像光谱仪 云和地球辐射能量系统 

分 类 号：P4[天文地球—大气科学及气象学] P2