Models of the millimeter-centimeter spectra of the giant planets

Details Models of the millimeter-centimeter spectra of the giant planets Models of the millimeter-centimeter spectra of the giant planets

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...62..143d&link_type=abstract

Icarus (ISSN 0019-1035), vol. 62, April 1985, p. 143-171.

Computer Science

98

Abundance, Atmospheric Models, Gas Giant Planets, Infrared Spectra, Microwave Spectra, Planetary Atmospheres, Absorptivity, Ammonia, Brightness Temperature, Centimeter Waves, Millimeter Waves, Optical Thickness, Radiant Flux Density, Planets, Giant Planets, Spectra, Models, Jupiter, Millimeter Waves, Wavelengths, Uranus, Neptune, Absorption, Centimeter Waves, Saturn, Atmosphere, Ammonia, Comparisons, Calculations, Distribution, Depth, Depletion, Abundance, Optical Properties, Water, Hypotheses

Scientific paper

A comparison of various model atmosphere calculations with data for all four giant planets is shown. It appeared that ammonia must be depleted in the upper atmospheres of all four planets by a factor of 4-5 with respect to the solar abundance for Jupiter (and Saturn) and by a factor of 100-200 for Uranus and Neptune. At deeper layers the optical depth is larger, due either to a larger abundance of ammonia or to absorption by the presence of water. Given the vertical ammonia distribution in the atmospheres as derived from the centimeter data, a best fit to the millimeter spectra of all four planets was found by changing the high frequency tail of the ammonium lineshape profile. It was found that a line profile which at millimeter wavelengths more closely resembles a Van Vleck-Weisskopf lineshape than the usually adopted Ben Reuven profile gives a rather satisfactory fit to the data of all four gaseous planets.

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