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气象:2020,46(3):336-345
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从FY-4A卫星遥感数据和GFS资料估算全天空状况下的地表长波辐射通量
闵敏,吴晓
(中山大学大气科学学院、广东省气候变化与自然灾害重点实验室和南方海洋科学与工程实验室(珠海),珠海 519082; 国家卫星气象中心,北京 100081; 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)
Estimating Surface Longwave Radiation Flux Under All-Sky Condition from FY-4A and GFS Data
MIN Min,WU Xiao
(School of Atmospheric Sciences, Sun Yat Sen University and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, and Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai 519082; National Satellite Meteorological Centre, Beijing 100081; Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, CMA, Beijing 100081)
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投稿时间:2018-11-14    修订日期:2019-06-05
中文摘要: 本文介绍一种利用FY 4A成像仪遥感数据和全球预报系统(GFS)资料估算全天空地表长波辐射通量的反演方法。该方法通过辐射传输模拟和统计回归计算建立云天地表下行长波辐射通量的反演模式,并基于GFS资料处理云覆盖地区的地表上、下行长波辐射通量。这种全天空状况下两种通量的反演结合了FY 4A晴空地表长波辐射业务产品和本文反演模式处理的云天地表上、下行长波辐射通量。2018年9月1日的处理结果与Aqua/CERES同类产品相对比,精度为:RMSE=20.52 W·m-2,R=0.9481,Bias=3.3 W·m-2(夜间地表下行辐射通量对比);RMSE=25.58 W·m-2, R=0.9096,Bias=5.4 W·m-2(白天地表下行辐射通量对比);RMSE=10.97 W·m-2,R=0.9762,Bias=-3.3 W·m-2(夜间地表上行辐射通量对比);RMSE=19.97 W·m-2,R=0.9283,Bias=5.0 W·m-2(白天地表上行辐射通量对比)。这些结果表明本文发展的方法能够反演出精度较好的云天上下行长波辐射通量资料,为今后利用FY 4后续星处理生成全天空状况下的地表长波辐射通量产品奠定了理论基础。
Abstract:In this study, the specific methods of estimating surface longwave radiation fluxes under all sky condition are elucidated. An inverse model for cloudy sky surface downward longwave radiation (DLR) flux retrieval is developed based on infrared radiative transfer calculation, statistical regression analysis of simulated data, and atmospheric profiles. After that, we combine the inverse model and GFS data to calculate FY 4A clean sky and cloudy sky DLR values. Then, on the basis of the Aqua/CERES global DLR product, it validates the corresponding product of FY 4A during day or night time. The final results show that RMSE=20.52 W·m-2, R=0.9481, BIAS=3.3 W·m-2 (nighttime); RMSE=25.58 W·m-2,R=0.9096, BIAS=5.4 W·m-2 (daytime). Besides, we also successfully calculate the cloudy sky upwelling longwave radiation (ULR) product at surface, which is combined with the operational FY 4A clear sky ULR product to make a joint all sky product. The validations of FY 4A all sky ULR show that RMSE=10.97 W·m-2,R=0.9762,BIAS=-3.3 W·m-2 (nighttime); RMSE=19.97 W·m-2, R=0.9283,BIAS=5.0 W·m-2 (daytime). The validation results mentioned above indicate the retrieval methods developed in this research are feasible and high quality, which could be used for retrieving new operational DLR/ULR products for FY 4 series satellites in future.
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基金项目:国家自然科学基金项目(41975031、41975020)和预先研究项目(D040103)共同资助
引用文本:
闵敏,吴晓,2020.从FY-4A卫星遥感数据和GFS资料估算全天空状况下的地表长波辐射通量[J].气象,46(3):336-345.
MIN Min,WU Xiao,2020.Estimating Surface Longwave Radiation Flux Under All-Sky Condition from FY-4A and GFS Data[J].Meteor Mon,46(3):336-345.