Calculation of longwave radiation fluxes in atmospheres

摘要: A technique for the computation of longwave radiative quantities using line-by-line approach has been developed in Soviet Union. The method applied to obtain fluxes and cooling rates standard atmospheric profiles used Intercomparison Radiation Codes Used Climate Models (ICRCCM) sponsored by World Meteorological Organization. sensitivity result changes vertical quadrature scheme, angular integration, spectral line shape is evaluated. Fluxes troposphere are general agreement with those obtained different models. Results from parameterized models, including a wideband statistical model one employing integral transmission function, have compared results. Flux errors simplified schemes order 10 W/m 2. these models profiles, or an increase CO2 amount, similar that calculations. Radiative heat exchange basic component energy transfer. numerical weather forecasting, climate theory, cloud generation, number mesoscale dynamic processes all invoke radiation codes compute this quantity. flux calculation algorithms differ appreciably each other always approximation exact solutions transfer equations. These approximations needed because (1) calculations be made quickly time as whole; (2) there insufficient information calculate fluxes, (3) spatial, particularly vertical, resolutions not sufficiently detailed. calculated consequence distinctiveness specific algorithms, initial data applied, resolutions, etc., model. We may thus ask how results simulation atmosphere affected differences techniques In settle question, we first attempted clear up simpler one: what accuracy can achieved means