Abstract
Spectral measurements of the outgoing thermal IR radiation carried out in 1977 and 1979 (SI-1 instrument, Meteor satellite) are used for estimating the CO2 content in the Earth’s atmosphere. A special algorithm based on the technique of artificial neural networks has been developed for solving the inverse problem of determining the CO2 content. The algorithm uses experimental spectra, as well as data on temperature and humidity from the NCEP CFSR reanalysis archive. Despite the presence of a noticeable variation in individual values of CO2 content in 1977 and 1979 (330–350 ppm), the estimates clearly demonstrate the seasonal variations of the carbon dioxide content for Europe and low values for the Southern Hemisphere. The spatial and temporal averaging of the retrieved CO2 estimates gives mean winter and spring–summer values for the European region at 338.2 and 336.5 ± 3.1 ppmv, correspondingly, which is in a good agreement with the ground-based measurements at Mauna Loa station.
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This study was supported by the Russian Foundation for Basic Research, project no. 17-05-00768.
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Timofeev, Y.M., Polyakov, A.V., Virolainen, Y.A. et al. First Satellite Measurements of Carbon Dioxide in the Earth’s Atmosphere (From the SI-1 Spectrometer Aboard the Meteor Satellite in 1979). Izv. Atmos. Ocean. Phys. 56, 401–404 (2020). https://doi.org/10.1134/S000143382004009X
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DOI: https://doi.org/10.1134/S000143382004009X