XCO_2 satellite retrieval experiments in short-wave and infrared spectra with SCIATRAN model for Sahara Desert  

作　　者：LI YanFen ZHANG ChunMin DAI HaiShan ZHANG XingYing ZHANG Peng 

机构地区：[1]School of Science, Xi'an Jiaotong University [2]Institute of Satellite Engineering, China Aerospace Science and Technology Corporation [3]Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, National Satellite Meteorological Center [4]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences

出　　处：《Science China Earth Sciences》2016年第11期2252-2259,共8页中国科学（地球科学英文版）

基　　金：supported by the National Major Project (Grant No. 32-Y30B089001-13/15);the State Key Program of National Natural Science Foundation of China (Grant No. 41530422);the National Natural Science Foundation of China (Grant Nos. 61540018, 61275184, 61405153);the National High Technology Research and Development Program of China (Grant No. 2012AA121101);the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130201120047)

摘　　要：The spectra of O_2 A-band(0.76 μm) and CO_2 near-infrared emissions(1.6 μm) are simulated by the SCIATRAN radiative transfer model(V3.1.23), and compared with those observed by GOSAT-FTS(Greenhouse gases Observing SATellite-Fourier Transform Spectrometer). Systematic deviations between the observed and simulated spectra are found to exist,especially for the O_2 A-band. The discrepancies are characterized by their mean differences averaged over the observed spectral ranges. A correction is applied to the observed GOSAT-FTS L1B(V141.141) spectra by scaling the spectral intensity measured by TANSO-FTS(Thermal and Near infrared Sensor for carbon Observation Fourier Transform Spectrometer) onboard GOSAT.The average columnar CO_2 concentrations(XCO_2) are retrieved from the observed and the corrected GOSAT-FTS spectra by using the SCIATRAN inversion algorithm. Compared with the GOSAT-FTS L2 XCO_2 data products retrieved from the observed spectra of GOSAT-FTS, the SCIATRAN retrievals from the corrected spectra show a much better agreement, with the relative error less than 1%. But the results of GOSAT TANSO-FTS(V161.160) show smaller residuals than GOSAT TANSO-FTS(V141.141) without mean residual correction. The results indicate that the mean residual correction would increase the precision of XCO_2 retrieval for spectra with systematic deviations.The spectra of O_2 A-band（0.76 μm） and CO_2 near-infrared emissions（1.6 μm） are simulated by the SCIATRAN radiative transfer model（V3.1.23）, and compared with those observed by GOSAT-FTS（Greenhouse gases Observing SATellite-Fourier Transform Spectrometer）. Systematic deviations between the observed and simulated spectra are found to exist,especially for the O_2 A-band. The discrepancies are characterized by their mean differences averaged over the observed spectral ranges. A correction is applied to the observed GOSAT-FTS L1B（V141.141） spectra by scaling the spectral intensity measured by TANSO-FTS（Thermal and Near infrared Sensor for carbon Observation Fourier Transform Spectrometer） onboard GOSAT.The average columnar CO_2 concentrations（XCO_2） are retrieved from the observed and the corrected GOSAT-FTS spectra by using the SCIATRAN inversion algorithm. Compared with the GOSAT-FTS L2 XCO_2 data products retrieved from the observed spectra of GOSAT-FTS, the SCIATRAN retrievals from the corrected spectra show a much better agreement, with the relative error less than 1%. But the results of GOSAT TANSO-FTS（V161.160） show smaller residuals than GOSAT TANSO-FTS（V141.141） without mean residual correction. The results indicate that the mean residual correction would increase the precision of XCO_2 retrieval for spectra with systematic deviations.

关 键 词：GOSAT-FTS SCIATRAN model Mean residual correction XCO_2 

分 类 号：P407.6[天文地球—大气科学及气象学]