Comparison results of satellite and ground-based spectroscopic measurements of CO, CH4, and CO2 total contents

A significant amount of satellite and ground-based data on the CO, CO2, and CH4 total contents for 2010–2013 was collected, classified, and analyzed. Transition relations between satellite and groundbased data on the content of impurities under study at different measuring sites (NDACC/ GAW and OIAP RAS stations) with different spatial and temporal resolutions have been found. A high correlation between daily average satellite-measured CO contents (AIRS v6 (R 2 = 0.48–0.96), IASI MetOp-A (R 2 = 0.25–0.86), and MOPITT v6 Joint (R 2 = 0.30–0.83) products, averaging over 1° × 1°) and the ground-based solar spectrometers’ data was ascertained for background conditions. In the case of high pollution of the mixing layer, a significant underestimation of the CO total content (by 1.7–4.7 times, depending on the sensor and observation point) by satellite sensors has been noted. Representative transition relations and correlation coefficients (R 2 ≥ 0.5) between satellite data on daily average CH4 contents and the data from ground-based diffraction spectrometers of A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences (IAP RAS) and Fourier spectrometers of GAW stations have been found only for the AIRS sensor. The best correlation with ground-based measurement data on CO2 (R 2 = 0.25 for daily average values, averaging over 1° × 1°) was found for the IASI sensor. The daily average CH4 total contents from the IASI MetOp-A sensor weakly correlate with the ground-based data and with AIRS data.