Comparison of Long-Term Trends and Interannual Variations of the NO₂ Content in the Atmosphere According to Satellite (OMI) and Ground-Based Spectrometric Measurements at NDACC Stations

The results of an analysis of long-term trends and interannual variations of the NO₂ content in the atmosphere according to measurements with the Ozone Monitoring Instrument (OMI) aboard the EOS Aura satellite in 2004–2020 are compared to the results of a similar analysis of the NO₂ content derived from independent spectrometric twilight NO₂ measurements by zenith-scattered solar radiation at stations of the Network for the Detection of Atmospheric Composition Change (NDACC). According to both data, seasonally dependent estimates of linear NO₂ trends and variations of the NO₂ content under the influence of an 11-year cycle of solar activity and large-scale circulation factors such as the Arctic and Antarctic Oscillations, variations in ocean surface temperature in the Niño 3.4 zone, and the quasi-biennial oscillation in zonal wind in the equatorial stratosphere have been obtained. In general, a good qualitative and, in some cases, quantitative correspondence between estimates of interannual variations of NO₂ has been obtained. For interannual variations of stratospheric NO₂, the correspondence between estimates based on satellite and ground-based data on average for all stations is not bad, but the correspondence between trend estimates is noticeably worse. The best correspondence between the analysis results has been obtained for the Zvenigorod station. For stratospheric NO₂, it was noted in 80–90% of cases, and the correspondence for tropospheric NO₂ is practically 100%.