Calculation of longwave radiation fluxes in atmospheres

Abstract

A technique for the computation of longwave radiative quantities using the line-by-line approach has been developed in the Soviet Union. Fluxes and cooling rates in the troposphere are in general agreement with those obtained with different line-by-line models. Results from parameterized models, including a wideband statistical model and one employing the integral transmission function, have been compared to the line-by-line results. Flux errors in the simplified schemes are of the order of 10 W/m2. The sensitivity of these models to changes in atmospheric profiles, or to an increase in CO2 amount, is similar to that of the line-by-line calculations. -from Authors