Research on Tropospheric NO2 Vertical Column Density Observation Based on MAX-DOAS

Nitrogen dioxide (NO
2
) is the main component of atmospheric pollution and mainly exists in the troposphere in the atmosphere. In this paper, NO
2
density in the atmospheric troposphere is monitored and analyzed based on the MAX-DOAS system, and the difference between the air mass factor (AMF) simulated by the geometrical approximation and the AMF simulated by the radiative transfer model SCIATRAN is analyzed in the inversion of the vertical column density (VCD) of NO
2
in the troposphere. The experiments show that at high elevation angles (e.g., 30°-60°), the AMF simulated by the geometric approximation is in good agreement with that simulated by SCIATRAN in the inversion of the tropospheric NO
2
VCD, but the geometric approximation ignores the influence of atmospheric complexity factors, and the relative deviation of the inverted tropospheric NO
2
VCD is larger.