The increase of greenhouse gas concentration is the most important factor leading to global warming, and the accuracy of carbon dioxide column concentration is required to be better than 0.25% in the total carbon column observation network. As the prior value of inversion model, the influence of prior profile on inversion accuracy needs to be further clarified. Based on Observation of the column-averaged dry air mole fractions of carbon dioxide in Hefei, the sensitivity of temperature profile, pressure profile and CO2 molecular profile to the column-averaged dry air mole fractions retrieval was analyzed. The main results are as follows: The temperature and pressure profiles have significant influence on the inversion results, the relative deviation of retrieving CO2 column concentration from the temperature and pressure profiles of 1976 US standard atmosphere and NCEP is 3.8%, and the maximum absolute deviation between them is 14ppm; The shift of the prior CO2 profile has no effect on the inversion accuracy. However, the change of the profile shape has a significant effect on the inversion accuracy. Therefore, using real-time temperature and pressure profiles and accurate gas prior profiles can improve the retrieval accuracy of greenhouse gas CO2 column concentration. These results provide a theoretical basis for the inversion of greenhouse gas column concentration in China.
A ground-based Fourier transform spectrometer has been established in Hefei, China to remotely measure H2O, CO2, CH4 and CO based on near-infrared solar spectra. The continuously retrieved time series of total column results for H2O, CO2, CH4 and CO are presented on April 2nd, 2018. The observation results show the variation of total column of CO2, CH4 and CO. The total columns of H2O, CO2, CH4 and CO are 1.35×10 23, 8.91×1011, 4.08×10 19 and 4.09×10 18 molecules/cm2, respectively. In order to reduce the systematic error of the instrument, we also calculate the column-averaged dry air mole fraction by the oxygen molecule as the internal standard. The column-averaged dry air mole fraction of H2O, CO2, CH4 and CO are 5289.43, 415.04, 1.907 and 0.178ppm, respectively. Furthermore, we analyze the atmospheric transmittance by using MODTRAN 5.0 based on the retrieved results. The comparison results show that the atmospheric transmittance has gaps in the absorption band
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