Radiative Equilibrium - Photochemical Model of Titan's Atmosphere

Details Radiative Equilibrium - Photochemical Model of Titan's Atmosphere Radiative Equilibrium - Photochemical Model of Titan's Atmosphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p53a1442a&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P53A-1442

Astronomy and Astrophysics

Astrophysics

5705 Atmospheres: Evolution, 6280 Saturnian Satellites, 3359 Radiative Processes, 0325 Evolution Of The Atmosphere, 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707)

Scientific paper

Titan's thermal structure has been characterized and studied by radiative/convective models [1,2,3,4] that are based on an assumed height distribution of species. Likewise, photochemical models [5,6,7,8,9] also employ a temperature profile as basis for the calculations. In this presentation, we discuss preliminary results of a coupled self-consistent radiative equilibrium/photochemical model for the middle and lower atmosphere of Titan. The radiative equilibrium model includes CH4 as the principal absorbent of thermal radiation, minor constituents, and the effect of pressure - induced absorption. The vertical distribution of species is calculated by a comprehensive photochemical model [9]. Our coupled radiative equilibrium/photochemical model is self-consistent, so that the temperature calculated in the radiative equilibrium model is used in the photochemical model to calculate the species vertical distribution, and this produced vertical distribution - in the radiation code, reiterating until both reach equilibrium. We are in the process of adding haze contribution to the radiative model for it serves as a main source of heating in the stratosphere. 1. Samuelson et al., Icarus, 53, 1983; 2. McKay et al., Icarus, 80, 1989; 3. Samuelson and Mayo, Icarus, 91, 1991; 4. McKay et al., Science, 253, 1991; 5.Yung et al., Astrophys. J. Suppl.,55,1984; 6. Toublanc, Icarus, 113, 1995; 7. Lara et al., JGR, 101, E10, 1996; 8. Lebonnois et al., Icarus,152, 2001; 9. Wilson and Atreya, JGR, E06002, 2004.

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