Seasonal Variations of Methane Cloud Formation in a Global Model of Titan's Atmosphere, TitanWRF.

Details Seasonal Variations of Methane Cloud Formation in a Global Model of Titan's Atmosphere, TitanWRF. Seasonal Variations of Methane Cloud Formation in a Global Model of Titan's Atmosphere, TitanWRF.

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5606n&link_type=abstract

American Astronomical Society, DPS meeting #39, #56.06; Bulletin of the American Astronomical Society, Vol. 39, p.529

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We will present results from multi-annual simulations of methane condensation in the troposphere of Titan, using the global version of the TitanWRF atmospheric model. TitanWRF is the Titan version of the PlanetWRF model (Richardson et al., 2007, JGR, in press). PlanetWRF differs from the model upon which it is based, NCAR's Weather Research and Forecasting model (www.wrf-model.org), in that it (a) can be run in global as well as limited area mode, and (b) is structured to be easily adapted to planets other than the Earth.
The methane condensation scheme includes for example (i) a surface source, depending on the sub-saturation of the lowest atmospheric layer and the strength of near-surface winds, as in Tokano et al. (2001, Icarus, 153, 130-147); (ii) determination of the type of condensate produced (methane ice or a binary liquid including dissolved nitrogen) depending on temperature; (iii) inclusion of a decrease in saturation vapor pressure for the binary liquid; (iv) different assumptions about the fate of any condensate produced.
Preliminary results show some interesting similarities to the observed location and timing of Titan clouds, and suggest further investigations which will also be discussed.
This work was funded by the Outer Planets Research Program and by the Applied Information Systems Research Program.

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