The downward and upward fluxes of IR radiation are calculated with use of three versions of the HITRAN spectroscopic database (release of 2008, 2012, 2020) and GEISA (2020 version) for meteorological conditions, typical for summer and winter of mid latitudes. The dependent two-sample t-test is used to analyse discrepancies in the radiative fluxes. It is shown that maximal differences in the fluxes at the top and bottom of atmosphere due to use of latest versions of the spectroscopic databases HITRAN2020 and GEISA2020 are not too large (less than 0.54 W/m2) but they are statistical significant.
The longwave radiative fluxes in the cloudless atmosphere are calculated for meteorological conditions of Lower Volga Region. The radiative forcing due to CO2 concentration increase for the latest 50 years is estimated. Modern models of water vapor continual absorption in the 3-5 and 8-12 m atmospheric transparency windows are compared. It is shown that the H2O continual absorption reduces the CO2 radiative forcing in case of high concentrations of atmospheric water vapor.
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