Jacobian matrix for near-infrared remote sensing based on vector radiative transfer model  

作　　者：Wenguang BAI Peng ZHANG Wenjian ZHANG Jun LI Gang MA Chengli QI Hui LIU 

机构地区：[1]National Satellite Meteorological Center,Beijing 100081,China

出　　处：《Science China Earth Sciences》2020年第9期1353-1365,共13页中国科学（地球科学英文版）

基　　金：supported by the National Key R&D Program of China(Grant Nos.2018YFB0504900&2018YFB0504905);the National Natural Science Foundation of China(Grant No.41975034);the Special Fund for Scientific Research(Meteorology)in the Public Interest(Grant Nos.GYHY201506022&GYHY201506002)。

摘　　要：Due to the polarization effects of the Earth’s surface reflection and atmospheric particles’scattering,high-precision retrieval of atmospheric parameters from near-infrared satellite data requires accurate vector atmospheric radiative transfer simulations.This paper presents a near-infrared vector radiative transfer model based on the doubling and adding method.This new model utilizes approximate calculations of the atmospheric transmittance,reflection,and solar scattering radiance for a finitely thin atmospheric layer.To verify its accuracy,the results for four typical scenarios(single molecular layer with Rayleigh scattering,single aerosol layer scattering,multi-layer Rayleigh scattering,and true atmospheric with multi-layer molecular absorption,Rayleigh and aerosol scattering)were compared with benchmarks from a well-known model.The comparison revealed an excellent agreement between the results and the reference data,with accuracy within a few thousandths.Besides,to fulfill the retrieval algorithm,a numerical differentiation-based Jacobian calculation method is developed for the atmospheric and surface parameters.This is coupled with the adding and doubling process for the radiative transfer calculation.The Jacobian matrix produced by the new algorithm is evaluated by comparison with that from the perturbation method.The relative Jacobian matrix deviations between the two methods are within a few thousandths for carbon dioxide and less than 1.0×10-3%for aerosol optical depth.The two methods are consistent for surface albedo,with a deviation below 2.03×10-4%.All validation results suggest that the accuracy of the proposed radiative transfer model is suitable for inversion applications.This model exhibits the potential for simulating near-infrared measurements of greenhouse gas monitoring instruments.

关 键 词：Vector radiative transfer Jacobian matrix calculation Aerosol scattering 

分 类 号：P407[天文地球—大气科学及气象学]