Analysis of NO2 and O3 Total Columns from DOAS Zenith-Sky Measurements in South Italy

The Gas Absorption Spectrometer Correlating Optical Difference—New Generation 4 (GASCOD/NG4) is a multi-axis differential optical absorption spectroscopy (MAX-DOAS) instrument which measures diffuse solar spectra at the Environmental-Climate Observatory (ECO) of Italian research institute CNR-ISAC, near Lecce. high-resolution measured in zenith-sky configuration were used to retrieve NO2 and O3 vertical column densities (VCDs) from March 2017 November 2019. These good-quality data, proven by comparison with Ozone Monitoring Instrument (OMI) TROPOspheric (TROPOMI) satellite measurements, characterize ECO site exploiting sinergy situ concentrations meteorological data. Although stratospheric processes seem be main forces behind VCDs seasonal trends, diurnal variabilities revealed presence tropospheric signal VCDs, had significant lower values during Sundays. Comparison wind data acquired observatory, 20 m above ground, how are influenced both local production transport nearby city On other hand, no was contained VCDs.