The effect of dynamics on the composition of Titan's upper atmosphere

Details The effect of dynamics on the composition of Titan's upper atmosphere The effect of dynamics on the composition of Titan's upper atmosphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29w..54m&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 23, pp. 54-1, CiteID 2139, DOI 10.1029/2002GL016100

Physics

8

Meteorology And Atmospheric Dynamics: Theoretical Modeling, Planetary Sciences: Atmospheres-Composition And Chemistry, Planetology: Solar System Objects: Saturnian Satellites

Scientific paper

Using a global time-dependent general circulation model, we calculate the distribution of constituents in Titan's thermosphere resulting from transport caused by winds and molecular and eddy diffusion. Our simulations reveal that thermospheric winds effectively mix constituents in Titan's upper atmosphere. Consequently, the large eddy coefficients inferred from Voyager UVS observations may be a result of vigorous thermospheric circulation on Titan. Thermospheric winds also cause large diurnal variations in composition, with equatorial CH4 mole fractions near 1400 km ranging from ~15% in the late afternoon to ~58% in the early morning at equinox.

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