Sentinel-5P TROPOMI data application and their comparison with OIAP spectroscopic datasets on CO and NO2 columns

This study considers usage of high-resolution data on CO and NO₂ of newest orbital spectrometer TROPOMI.
First, using our own software package Level 2 data (15 NetCdf files for every day) were converted to Level 3 (one daily mat-file) while maintaining spatial resolution. Then CO total content (CO TC) and NO₂ tropospheric (NO₂ TrC) and total content (NO₂ TC) OFFL diurnal data were compared with OIAP ground-based measurements in Moscow and at Zvenigorod Scientific station (ZSS, Moscow province, 53 km West from Moscow) as well as with AIRS CO TC observations.
The character of dependence between ground-based and satellite data was chosen as linear:
U_gr = KU_stl + A, were U_gr and U_stl are ground-based and satellite contents of an impurity, respectively; A is the constant.
High correlation between TROPOMI CO OFFL and ground-based CO TC measurements was obtained, with R~ 0.79-0.85, K~0.78-0.91, A~2.3-5.0*10¹⁷ molec/cm² in dependence on orbital data resolution.
Correlation parameters depend on viewing azimuth angle VZA (the best correlation was obtained for VZA≤50º) and do not significantly depende on the Earth albedo.
For diurnal NO₂ TrC OFFL for ZSS were obtained R~ 0.41-0.48, K~3.3-4.3, A~0.9-1.1*10¹⁵ molec/cm²and for NO₂ TC OFFL R~0.59-0.61, K~6.7-7.0, A~ (-)0.76-0.86 *10¹⁵ molec/cm².
Additional possibilities to calculate averaged spatial and trend distributions of different atmospheric species based on TROPOMI data using our original software are presented.  
The study was supported by Russian Science Foundation under grant №21-17-00210. NO₂ data comparison was supported by the Russian Foundation for Basic Research, grant №20-05-00274.