Other
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2021s&link_type=abstract
American Astronomical Society, DPS meeting #28, #20.21; Bulletin of the American Astronomical Society, Vol. 28, p.1133
Other
Scientific paper
IRIS spectra of Titan's north polar hood reveal the 478 cm-1 feature of condensed C4N2, and a residual continuum opacity between 300 and 600 cm-1 consistent with a thin stratospheric ethane cloud. An investigation of the variation with latitude of the 300 - 600 cm-1 continuum implies that the mole fraction of methane near the surface varies from about 0.02 at high latitudes to 0.06 near the equator. A detailed analysis suggests the following picture. Titan's photochemical aerosol is the source of seed nuclei for condensed C4N2 and other nitriles, which in turn act as sources of seed nuclei for condensed ethane. These stratospheric condensates precipitate into the upper troposphere, where methane condensation occurs. Particle growth is rapid, and methane particles quickly precipitate to near the surface where they almost, but not quite, evaporate. Particles reaching the surface are highly enriched in ethane. A strong seasonal effect is responsible for preferential precipitation near the poles during local spring, with little precipitation evident at low latitudes. As a result, over time, the poles of Titan are enriched with liquid ethane relative to regions near the equator.
Mayo Lou
Nath Nitya
Samuelson R.
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