Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...61..296b&link_type=abstract
Icarus (ISSN 0019-1035), vol. 61, Feb. 1985, p. 296-310. Research supported by the Centre National d'Etudes Spatiales and Instit
Astronomy and Astrophysics
Astronomy
26
Atmospheric Models, Gas Giant Planets, Planetary Atmospheres, Radiative Transfer, Saturn Atmosphere, Stratosphere, Annual Variations, Atmospheric Heating, Far Infrared Radiation, Radio Occultation, Stratospheric Warming, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Planets, Giant Planets, Seasonal Variations, Climate, Models, Atmosphere, Voyager Missions, Saturn, Stratosphere, Radiative Transfer, Wavelengths, Optical Properties, Opacity, Hydrocarbons, Hydrogen, Helium, Methane, Insolation, Asymmetry, Depth,
Scientific paper
A radiative seasonal model of Saturn's stratosphere which incorporates a multilayer radiative transfer treatment in the far-infrared (wavelength greater than 7 microns) with opacities due to H2-He, CH4, C2H6, and C2H2 is presented. The model predicts a strong hemispheric asymmetry at the Voyager encounter times as a consequence of seasonally variable insolation, and polar regions are found to undergo seasonal amplitudes as high as 30 K in the upper stratosphere. Ring obscuration is shown to have a substantial effect on the heat balance at midlatitudes. Calculations agree closely with the Voyager 1 and 2 radio occultation ingress profiles recorded at 76 deg S and 36.5 deg N for CH4/H2 = 0.0035 + 0.0014 or -0.001; the estimated errors take into account modeling uncertainties. The possible role of aerosols in the stratospheric heating is analyzed. It is shown that the Voyager 2 egress profile (31 deg S) cannot be reproduced by calculations. Some constraints on the CH4 mixing ratio and on the C2H6 and C2H2 vertical distributions are derived.
Bezard Bruno
Gautier Daniel
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