Comparison of OMI-DOAS total ozone column with ground-based measurements in Argentina

Total ozone column (TOC) measurements through the Ozone Monitoring Instrument (OMI/NASA EOS-Aura) are compared with ground-based observations made using Dobson and SAOZ instruments for the period 2004-2019 and 2008-02/2020, respectively. The OMI data were inverted using the Differential Optical Absorption Spectroscopy algorithm (overpass OMI-DOAS). The four ground-based sites used for the analysis are located in subpolar and subtropical latitudes spanning from 34 degrees S to 54 degrees S in the Southern Hemisphere, in the Argentine cities of Buenos Aires (34.58 degrees S, 58.36 degrees W; 25 m a.s.l.), Comodoro Rivadavia (45.86 degrees S, 67.50 degrees W; 46 m a.s.l.), Rio Gallegos (51.60 degrees S, 69.30 degrees W; 72 m a.s.l.) and Ushuaia (54.80 degrees S, 68.30 degrees W; 14 m a.s.l.). The linear regression analyzes showed correlation values greater than 0.90 for all sites. The OMI measurements revealed an overestimation of less than 4 % with respect to the Dobson instruments, while the comparison with the SAOZ instrument presented a very low underestimation of less than 1 %.