Analytical formulae to estimate a sensitivity of downward longwave radiative fluxes to the atmospheric total water vapor content in the absorption bands and the atmospheric transparency windows are obtained. A regression dependence of the CO2 radiative forcing on total water vapor content for the Lower Volga region is calculated. The role of Н2О continual absorption is investigated and it is shown that the CO2 radiative forcing depends strongly on the continuum value. The atmospheric conditions are defined, when the contribution of the H2O foreign continuum to the downward radiative fluxes is maximal.
continual absorption, transfer of radiation, radiative forcing
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