Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p21a1335z&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P21A-1335
Physics
0317 Chemical Kinetic And Photochemical Properties, 0343 Planetary Atmospheres (5210, 5405, 5704), 1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), 5405 Atmospheres (0343, 1060), 6281 Titan
Scientific paper
The chemical and dynamical processes in the atmosphere of Titan are poorly quantified. In this presentation, we constrain the transport using the data obtained by the Cassini and Voyager spacecrafts, with emphasis on Cassini measurements. A two-dimensional photochemistry transport model is used to model the distribution of hydrocarbons at latitudes from pole to pole and altitudes from the tropopause (about 50 km) to about 1500 km. Currently no GCM is available to provide transport of species over such wide a range of altitudes. The transport is obtained from the model of Newman et al. (2008) by analogy with the Earth's transport, as the two objects have similar obliquity and major chemical composition, N2. The reference transport is too fast. Modifications of this transport are made to reproduce the observations. Cassini UVIS and CIRS measurements are used to constrain the model above and below about 500 km, respectively. Implications of the model are discussed.
Liang Manlai
Shia R.
Yung Yuk L.
Zhang Xinyu
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