Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p33a1268l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P33A-1268
Physics
[0360] Atmospheric Composition And Structure / Radiation: Transmission And Scattering, [3319] Atmospheric Processes / General Circulation, [5405] Planetary Sciences: Solid Surface Planets / Atmospheres, [6295] Planetary Sciences: Solar System Objects / Venus
Scientific paper
General Circulation Models (GCMs) of the Venus atmosphere forced with linearized cooling exhibit significant sensitivity to the prescribed heating structure. In order to improve the radiative forcing used in GCMs we have developed a medium resolution, full scattering, radiative transfer model (RTM) to provide optical properties and reference heating conditions for the Venus atmosphere over a wide wavelength range. We describe the components used by the RTM, including an efficient K-coefficient description of the gaseous absorbers, Mie/Henyey-Greenstein scattering by particulate matter in the clouds, Rayleigh scattering by the major gases, continuum absorption, and additional Ultra Violet and Visible gaseuous absorption. The implementation of the RTM is modular and allows any valid wavelength range to be investigated given sufficient optical data. We show the results of validation experiments using the RTM. We calculate fluxes in the near Infra-Red optical windows near 1.0 micron, 1.7 micron and 2.3 micron using native VIRTIS spectral resolution K-coefficients, and degrade the resolution to test the sensitivity to nearby high opacity spectral features. We calculate fluxes and heating rates for a sample profile from the Venus International Reference Atmosphere (VIRA), and additionally provide geometric albedo (0.85), bond albedo (0.72), and downward diffuse and direct solar fluxes at the surface (17W/m/m between 350-750 nm) for the same profile. We discuss the work required to create a suitable self-consistent radiative forcing for a GCM using this RTM. A two-stream implementation is considered and tested using the TWOSTR flux solver and the calculations required to produce a Curtis Matrix algorithm are described.
Lee Chaohong
Richardson Mark I.
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