Spectroscopic measurements of O3 and NO2 atmospheric content: Correction of ground-based method and comparison with satellite data

Abstract

The results of daily observations of O3 and NO2 atmospheric total content near St. Petersburg retrieved from the automated ground-based measurements of zenith-sky scattered visible solar radiation are presented. The measurements of 2009–2013 are compared with the data of satellite measurements with the GOME (ERS-2), SCIAMACHY (ENVISAT), and OMI (AURA) satellite spectrometers. The analysis of differences revealed between the data of satellite and ground-based measurements allowed us to improve the ground-based method (DOAS technique) and decrease the average difference down to ~2 and ~20% for O3 and NO2, respectively. Remaining differences may be further decreased if the seasonal variability of air mass factors calculated is taken into account in the ground-based method.