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Infrared Radiation Parameterizations in Numerical Climate Models
Publisher: American Meteorological Society
Abstract: Parameterizations for infrared radiation (IR) in clear atmosphere can be made fast and accurate by grouping spectral regions with similar radiative properties, and by separating the low pressure region of the atmosphere ...
One-Parameter Scaling and Exponential-Sum Fitting for Water Vapor and CO2 Infrared Transmission Functions
Publisher: American Meteorological Society
Abstract: A medium-sized band model for water vapor and CO2 absorption is developed using the one-parameter scaling approximation. The infrared spectrum is divided into 10 bands. The Planck-weighted diffuse transmittance is reduced ...
Parameterizations for Water Vapor IR Radiative Transfer in Both the Middle and Lower Atmospheres
Publisher: American Meteorological Society
Abstract: Water vapor contributes a maximum of 1°C/day to the middle atmospheric thermal infrared (IR) cooling. This magnitude is small but not negligible. Because of the small amount of mass involved and the extremely narrow molecular ...
Biases in Shortwave Column Absorption in the Presence of Fractal Clouds
Publisher: American Meteorological Society
Abstract: In this paper, the effect of cloud structure on column absorption by water vapor is investigated. Radiative fluxes above and below horizontally inhomogeneous liquid water clouds are computed using an efficient Monte Carlo ...
Spectral Absorption of Solar Radiation in Cloudy Atmospheres: A 20 cm−1 Model
Publisher: American Meteorological Society
Abstract: The spectral of solar radiation in typical water clouds is determined using a radiative transfer model based on LOWTRAN transmission functions at a 20 cm?1 resolution and Monte Carlo simulations of photon pathlength ...
Independent Pixel and Monte Carlo Estimates of Stratocumulus Albedo
Publisher: American Meteorological Society
Abstract: Monte Carlo radiative transfer methods are employed here to estimate the plane-parallel albedo bias for marine stratocumulus clouds. This is the bias in estimates of the mesoscale-average albedo, which arises from the ...
The Albedo of Fractal Stratocumulus Clouds
Publisher: American Meteorological Society
Abstract: An increase in the planetary albedo of the earth-atmosphere system by only 10% can decrease the equilibrium surface temperature to that of the last ice age. Nevertheless, albedo biases of 10% or greater would be introduced ...