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xco_2 satellite retrieval experiments in short-wave and infrared spectra with sciatran model for Sahara Desert

Science China Earth Sciences 2016年第11期59卷 2252-2259页

作者： LI YanFen ZHANG ChunMin DAI HaiShan ZHANG XingYing ZHANG Peng School of Science Xi'an Jiaotong University Institute of Satellite Engineering China Aerospace Science and Technology Corporation Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological Center State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences

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 *** 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

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