Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.3118l&link_type=abstract
American Astronomical Society, DPS meeting #40, #31.18; Bulletin of the American Astronomical Society, Vol. 40, p.449
Astronomy and Astrophysics
Astronomy
Scientific paper
The chemical and dynamical processes in the atmosphere of Titan are poorly known. In this presentation, we constrain the transport using the data obtained by the Cassini and Voyager spacecrafts, with a primary focus on Cassini measurements. A two-dimensional photochemical model is used to model the distribution of hydrocarbons at latitudes from pole to pole and altitudes from the tropopause ( 50 km) to 1500 km. No GCM is available to provide transport of species over such wide a range of altitudes. The transport is obtained by analogy with the Earth's transport (from surface to 150 km), as the two objects have similar obliquity and major chemical composition, N2. The reference transport is too fast. Modifications to this transport are made to reproduce the observations. Above 500 km, Cassini UVIS data are used; Cassini CIRS measurements are preferred for lower altitudes. Implications of the model are discussed.
Liang Mao-Chang
Yung Yuk
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