Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.1708b&link_type=abstract
American Astronomical Society, DPS Meeting #32, #17.08; Bulletin of the American Astronomical Society, Vol. 32, p.1024
Physics
Scientific paper
Toon et al. (1992, Icarus 95, 24-53) constrained Titan's aerosol distribution for the first 600 km of the atmosphere using a microphysics model. They found that that particles with size on the order of 0.1 μ m and a strongly wavelength dependent optical depth with a value at 1 μ m near 0.5, were consistent with currently available observations. We have revised the model to include a high altitude ethane vapor flux (5.8 molecules/cm2/s) which leads to the formation of clouds in the lower stratosphere and troposphere. The cloud particles tend to be larger than the aerosol particles, but much less abundant due to large, assumed, nucleation barriers. Nucleation occurs mostly at 52 - 54 km altitude. The particles produced are sparse and grow to 100's of microns and so do not have a significant visible optical depth. Some transient nucleation events below 20 km could allow clouds to be visible for short periods of time. Optical depths are calculated at near-infrared wavelengths for comparison with HST WFPC2 images. This work was supported by NASA grant NAG5-6900.
Barth Erika L.
Esposito W. L. W. L.
Toon Brian O.
Young Eliot Fisher
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