Application of methane band-model parameters to the visible and near-infrared spectrum of Uranus

Details Application of methane band-model parameters to the visible and near-infrared spectrum of Uranus Application of methane band-model parameters to the visible and near-infrared spectrum of Uranus

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...42..343b&link_type=abstract

Icarus, vol. 42, June 1980, p. 343-353.

Physics

Optics

Absorption Spectra, Atmospheric Models, Infrared Spectra, Light (Visible Radiation), Methane, Near Infrared Radiation, Uranus Atmosphere, Absorptivity, Abundance, Albedo, Atmospheric Attenuation, Atmospheric Optics, Light Scattering, Optical Thickness, Uranus, Infrared, Spectrum, Parameters, Bands, Models, Methane, Light (Visible Radiation), Atmosphere, Layers, Reflectivity, Albedo, Scattering, Optical Properties, Depth, Wavelengths, Abundance, Data, Pressure, Photometry, Spectroscopy, Comparisons, Absorpti

Scientific paper

Laboratory band-model absorption coefficients of CH4 were used to calculate the Uranus spectrum from 5400 to 10,400 A. A good fit for both strong and weak bands for the Uranus spectrum over the entire wavelength interval was achieved; three atmospheric models were employed: (1) a reflecting layer model; (2) a homogeneous scattering layer model; and (3) a clear atmosphere sandwiched between two scattering layers. The spectrum for the reflecting layer model shows serious discrepancies but indicates that large amounts of CH4 are necessary to reproduce the Uranus spectrum. Both scattering models gave reasonably good fits; the homogeneous model requires a particle scattering albedo of at least 0.998 and an abundance per scattering mean free path of about 1 km-am. For the sandwich model, a continuum single scattering albedo of 0.995 was derived for the upper scattering layer, and the scattering optical depth variable wavelength was consistent with Rayleigh scattering.

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