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.
The upward and downward fluxes of longwave radiation are simulated for the atmospheric conditions observed in summer and winter in Lower Volga region. The discrepancies in the longwave fluxes in the radiative block of the RegCM climatic model due to use of different water vapor continuum models are estimated. The continuum models used in NCAR CCM3 and RRTM radiation schemes in the regional climate model RegCM 4.5 are considered.
The atmospheric radiative fluxes and cloud radiative forcing are simulated with use of different models of water vapor continuum absorption and cloud optical depths. The effects of radiative heating and cooling of the cirrus cloudiness are analysed. A contribution of water vapor continuum absorption to the atmospheric radiative transfer is estimated. It is shown that sign of cloud radiative effect depends on choice of water vapor continuum model.
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