Measurements of total ozone content in the 4.7 µm region with a medium-resolution FTIR spectrometer and comparison with satellite data

The total ozone content (TOC) measurements results by the ground-based MR-32 instrument in 2015–2022 at the Obninsk station (55.11N; 36.60E) are presented. Solar radiation was measured by the FTIR spectrometer of medium resolution of 0.12 cm−1. Based on the analysis of the absorption spectra the relevant spectral intervals in the region of 4.7 microns were determined. The SFIT4 program was applied to retrieve total ozone content. A comparison of the results of TOC measurements by the MR-32 instrument with satellite data of OMPS, OMI, and SBUV(MOD) showed good agreement. The correlation coefficients are 0.93–0.97. According to spectral and cross-correlation wavelet analysis, ground and satellite oscillations with periods from 4 to 60 months occur of almost synchronously. The systematic discrepancies between daily average ground-based and satellite TO measurements are (−0.8 ± 3.6)%, (−0.2 ± 3.7)% and (−2 ± 5)% for OMPS, OMI and SBUV(MOD), respectively.