Water vapour continuum absorption contributes significantly to radiative processes, reaching 20% in the downward fluxes. At present, the H_2O continuum absorption is one of the major sources of uncertainty in IR radiative transfer calculations. We analyse modern models of water vapour continuum absorption. The sensitivity of downward longwave fluxes to the continual absorption of water vapour is investigated. The spectral intervals, where the continuum absorption is the most significant, are defined. An analysis of recently discovered discrepancies between the model and experimentally measured absorption coefficients in the atmospheric transparency window of 8-12 μm, is made. Results of the downward longwave radiative fluxes modeling for typical meteorological conditions of Western Siberia and Nizhnee Povolzhie regions are presented.
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