The influence of radiative transfer on the propagation of a temperature wave in a stratified diffusing atmosphere

1960 ◽  
Vol 9 (3) ◽  
pp. 445-454 ◽  
Author(s):  
R. M. Goody
Keyword(s):  
Approximate Solution ◽  
Radiative Transfer ◽  
Lower Boundary ◽  
Temperature Wave ◽  
Stratified Medium ◽  
Phase Lag ◽  
Radiative Effects ◽  
Attenuation Coefficients ◽  
Earth’S Atmosphere ◽  
Earth's Atmosphere

An approximate solution is presented to the problem of the propagation of a temperature wave through a stratified medium which both diffuses and radiates heat. The solution is a combination of two waves whose relative amplitudes vary with the distance from the lower boundary. Apparent diffusivities computed from phase lag and attenuation coefficients can differ greatly from each other and can vary with height even if the actual diffusivity does not.An example, using parameters simulating the earth's atmosphere, suggests that analysis of the propagation of the diurnal wave upward from the earth's surface is likely to be inadequate if radiative effects are not considered.

scholarly journals Technical note: The libRadtran software package for radiative transfer calculations - description and examples of use

2005 ◽  
Vol 5 (7) ◽  
pp. 1855-1877 ◽  
Author(s):  
B. Mayer ◽  
A. Kylling
Keyword(s):  
Radiative Transfer ◽  
Software Package ◽  
Main Tool ◽  
Technical Note ◽  
Earth’S Atmosphere ◽  
Versatile Tool ◽  
Earth's Atmosphere

Abstract. The libRadtran software package is a suite of tools for radiative transfer calculations in the Earth's atmosphere. Its main tool is the uvspec program. It may be used to compute radiances, irradiances and actinic fluxes in the solar and terrestrial part of the spectrum. The design of uvspec allows simple problems to be easily solved using defaults and included data, hence making it suitable for educational purposes. At the same time the flexibility in how and what input may be specified makes it a powerful and versatile tool for research tasks. The uvspec tool and additional tools included with libRadtran are described and realistic examples of their use are given. The libRadtran software package is available from http://www.libradtran.org.

Radiative transfer in the earth's atmosphere and ocean: influence of ocean waves

1975 ◽  
Vol 14 (8) ◽  
pp. 1924 ◽  
Author(s):  
Gilbert N. Plass ◽  
George W. Kattawar ◽  
John A. Guinn
Keyword(s):  
Radiative Transfer ◽  
Ocean Waves ◽  
Earth’S Atmosphere ◽  
Earth's Atmosphere

scholarly journals A Radiative Transfer Module for Calculating Photolysis Rates and Solar Heating in Climate Models: Solar-J 7.5

2017 ◽  
Author(s):  
Juno Hsu ◽  
Michael Prather ◽  
Philip Cameron-Smith ◽  
Alex Veidenbaum ◽  
Alex Nicolau
Keyword(s):  
Radiative Transfer ◽  
Solar Spectrum ◽  
Solar Heating ◽  
Gas Absorption ◽  
Transfer Model ◽  
Cirrus Cloud ◽  
Stratus Cloud ◽  
Earth’S Atmosphere ◽  
Photolysis Rates ◽  
Earth's Atmosphere

Abstract. Solar-J is a comprehensive model for radiative transfer over the solar spectrum that addresses the needs of both photochemistry and solar heating in Earth system models. Solar-J includes an 8-stream scattering, plane-parallel radiative transfer solver with corrections for sphericity. It uses the scattering phase function of aerosols and clouds expanded to 8th order and thus makes no isotropic-equivalent approximations that are prevalent in most solar heating codes. It calculates both chemical photolysis rates and the absorption of sunlight and thus the heating rates throughout the Earth's atmosphere. Solar-J is a spectral extension of Fast-J, a standard in many chemical models that calculates photolysis rates in the 0.18–0.85 μm region. For solar heating, Solar-J extends its calculation out to 12 μm using correlated-k gas absorption bins in the infrared from the shortwave Rapid Radiative Transfer Model for GCM applications (RRTMG-SW). Solar-J successfully matches RRTMG's atmospheric heating profile in a clear-sky, aerosol-free, tropical atmosphere. We compare both codes in cloudy atmospheres with a liquid-water stratus cloud and an ice-crystal cirrus cloud. For the stratus cloud both models use the same physical properties, and we find a systematic low bias in the RRTMG-SW of about 3 % in planetary albedo across all solar zenith angles, caused by RRTMG-SW's 2-stream scattering. Discrepancies with the cirrus cloud using any of RRTMG's three different parameterizations are larger, less systematic, and occur throughout the atmosphere. Effectively, Solar-J has combined the best components of RRTMG and Fast-J to build a high-fidelity module for the scattering and absorption of sunlight in the Earth's atmosphere, for which the three major components – wavelength integration, scattering, and averaging over cloud fields all have comparably small errors. More accurate solutions come with increased computational costs, about 5x that of RRTMG, but there are options for reduced costs or computational acceleration that would bring costs down while maintaining balanced errors across components and improved fidelity.

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