Inversion of Aerosol Optical Depth Over Land from Directional Polarimetric Camera Onboard Chinese Gaofen-5 Satellite
投稿时间:2019-08-02  修订日期:2020-01-02  download
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黄红莲 中国科学院通用光学定标与表征技术重点实验室 中国科学院安徽光学精密机械研究所
安徽 合肥 230031 
提汝芳 中国科学院通用光学定标与表征技术重点实验室 中国科学院安徽光学精密机械研究所
安徽 合肥 230031 
张冬英 中国科学院通用光学定标与表征技术重点实验室 中国科学院安徽光学精密机械研究所
安徽 合肥 230031 
方薇 中国科学院通用光学定标与表征技术重点实验室 中国科学院安徽光学精密机械研究所
安徽 合肥 230031 
孙晓兵 中国科学院通用光学定标与表征技术重点实验室 中国科学院安徽光学精密机械研究所
安徽 合肥 230031 
易维宁 中国科学院通用光学定标与表征技术重点实验室 中国科学院安徽光学精密机械研究所
安徽 合肥 230031 
Abstract:Directional Polarimetric Camera (DPC) can acquire multi-spectral, multi-angle, radiometric and polarimetric reflectance data from the earth. It was successfully launched with Gaofen-5 satellite in May 2018. A method for the inversion of aerosol optical depth is presented by the fully utilize of multi-spectral, multi-angle and polarimetric data. Firstly, the polarized land surface reflectance is calculated using the Nadal-Breon semi-empirical model to deduct the land surface radiation from the measured value. Secondly, the vector radiation transfer model and double-accumulation method are used to construct the lookup table of aerosol optical parameters. Then, the minimum residual is calculated to determine the aerosol model dynamically for the retrieving of aerosol optical thickness over the land.Using the L1 products of DPC, the aerosol optical thickness in eastern China are retrieved. The values are compared with the product of MODIS and what measured by AERONET ground station displaced at several places measured at the same time. Results show that the distribution of aerosol optical thickness retrieved from DPC data is in good agreement with MODIS aerosol product. And also, the results of DPC are highly correlated with the what measured by AERONET ground station. The correlation coefficients of 670nm and 865nm bands are above 0.8. It demonstrates the feasibility of the algorithm and what we have considered over land.
keywords:aerosol  optical thickness  directional polarized camera  polarization reflectance  Gaofen-5 satellite
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Copyright:《Journal of Infrared And Millimeter Waves》