Polyakov, A., E. Kriukovskikh, Ya. Virolainen, G. Nerobelov, D. Kozlov, and Yu. Timofeyev, Determining the Total Ozone Column from Spectral Measurements of IKFS-2 in 2015–2022, Izvestiya, Atmospheric and Oceanic Physics, 2024, Vol. 60, No. 6, pp. 689–698, Q4
Abstract
The results of determining the ozone total column (OTC) from the spectra of the outgoing thermal infrared radiation measured by the IKFS-2 instrument from the Meteor-M No. 2 spacecraft during 8 years of measurements are presented. The previously developed technique for the interpretation of spectral measurements made in 2015–2020 with a swath width (SW) of 1000 km is applied to the measurements in 2021– 2022 with a SW of 1500 km. It is shown that the increase in the differences between the IKFS-2 data and the results of independent measurements is caused not by the expansion of the OTC variability statistics, but by the increase in the range of scanning angle variation.
After a finalization of the technique for the measurements with a 1500-km SW, a comparison with independent data showed that the standard deviations of differences with the results of ground and satellite measurements for all 8 years do not exceed 3% and did not increase compared to the first 6 years of measurements. To analyze the results in the polar regions, the OTC values obtained from the IKFS-2 spectra are compared with the ozonesonde data, which are performed continuously throughout the year, including the polar night.
A good qualitative agreement of the IKFS-2 data and ozone sounding data, including winter–spring periods of extreme OTC decrease at high latitudes of both hemispheres, is shown. The standard deviations of the differences between the IKFS-2 data and the OTC values from ozone sounding data were from 5.3 to 11% (17–33 DU) for different stations, or on average for all stations 7.9%, which is consistent with the uncertainty of the estimates of the integrated ozone content in the vertical column from ozonesonde data.