The atmospheric water vapor content effect on carbon dioxide and methane radiative forcing in the troposphere and stratosphere
K.M. Firsov1, T.Yu. Chesnokova2, A.A. Razmolov1
1Volgograd State University, Volgograd, Russia
2V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: radiative forcing, methane, carbon dioxide, water vapor continuum, atmospheric radiative transfer
Abstract
According to the IPCC-2021 Report on climate change, the atmospheric CO2 and CH4 concentrations have increased by around a quarter for the last 50 years. The CO2 and CH4 radiative forcing due to their concentration growth was calculated for mid-latitudes. The vertical profiles of temperature and humidity were taken from the ECMWF ERA-5 European reanalysis data. An impact of overlapping of H2O absorption bands with CO2 and CH4 bands on the radiative forcing calculation results in the troposphere and stratosphere of mid-latitudes with different water vapor content was investigated by statistical methods. It was shown that absolute value of the CO2 radiative forcing in the troposphere increases with the atmospheric water vapor content, whereas the CH4 radiative forcing does not depend on the atmospheric total column water vapor.
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