Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30.1062o&link_type=abstract
American Astronomical Society, DPS meeting #30, #27.P09; Bulletin of the American Astronomical Society, Vol. 30, p.1062
Astronomy and Astrophysics
Astronomy
Scientific paper
The results of a new photochemical model of Saturn's atmosphere are presented. This model derives from the model of Neptune developed by Dobrijevic et al. (1998). This 1-D photochemical code includes hydrocarbons and oxygen compounds. Vertical transport is driven by molecular and eddy diffusion. External fluxes are also included. Photodissociation rates are determined using a radiative transfer treatment which takes multiple scattering into account. We compare the results to Voyager data, groundbased observations, and recent ISO data. Reproducing methane mole fraction observations gives constraints on its tropospheric mole fraction and eddy diffusion profile. Using these parameters leads to an overabundance of methyl radical in comparison with ISO results (Bezard et al. 1998) and to an underestimation of the abundance of higher hydrocarbons. Possible explanations are: (i) higher recombination rates of CH_3, (ii) chemical process not included in the model. External fluxes of oxygenated materials have been included. We find a good agreement with ISO observations (Feuchtgruber et al. 1997): sigma H_2O=6.8 10(14) molecules cm(-2) and sigma CO_2=7.3 10(14) molecules cm(-2) with external fluxes Phi H_2O=10(6) molecules cm(-2) s(-1) , Phi CO=2 10(5) molecules cm(-2) s(-1) and Phi CO_2=6 10(4) molecules cm(-2) s(-1) . Relative proportion of these fluxes is equal to the mean composition of comets (CO/H_2O=0.2, CO_2/H_2O=0.06 from Despois, 1998). CO has also an internal origin, as these external fluxes can't reproduce the abundance of CO derived by Noll & Larson (1990).
Dobrijevic Michel
Ollivier Jean-Luc
Parisot J.-P.
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