Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.3110f&link_type=abstract
American Astronomical Society, DPS meeting #40, #31.10; Bulletin of the American Astronomical Society, Vol. 40, p.448
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the formulation of and results from global climate models for Titan and Uranus. The model for Titan is a fully three-dimensional, modified version of NCAR's terrestrial global climate model, CAM-3. It includes forcing by Saturn's gravitational tides; a treatment of the planetary boundary layer and surface interactions; scattering and absorption of short-wave radiation; and absorption and emission of long-wave radiation. The physical properties and distribution of minor species and aerosols are constrained by Cassini observations. We focus on results concerning Titan's global angular momentum budget obtained after 20 Titan-years of model integration. These results are qualitatively similar to those obtained by the Cologne model (Tokano & Neubauer 2005, GRL 32, 24203). Our model predicts seasonal variations in Titan's rate of rotation due to atmosphere-surface interaction. During the present epoch of Cassini observations, the length of day is predicted to be shorter by 12-120 s (depending on the value assumed for Titan's effective moment of inertia) relative to that of synchronous rotation, bracketing the measurement by Cassini Radar (Stiles et al. 2008, Astron. J., 135, 1669). For Uranus we find that energy transfer associated with ortho-para hydrogen conversion dominates that due to sensible heat fluxes in the meridional energy transport, suggesting that little if any meridional sensible heat transport is required in the deep atmospheres/interiors of the ice giants. Our research on Uranus is supported by the NASA Outer Planet Research Program.
Friedson Andrew James
Oyafuso Fabiano
West Robert A.
Wilson Eric Hezekiah
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