Titan trace gaseous composition from CIRS at the end of the Cassini-Huygens prime mission

Details Titan trace gaseous composition from CIRS at the end of the Cassini-Huygens prime mission Titan trace gaseous composition from CIRS at the end of the Cassini-Huygens prime mission

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010icar..207..461c&link_type=abstract

Icarus, Volume 207, Issue 1, p. 461-476.

Computer Science

21

Scientific paper

This paper reports on the results from an extensive study of all nadir-looking spectra acquired by Cassini/CIRS during the 44 flybys performed in the course of the nominal mission (2004-2008). With respect to the previous study (Coustenis, A., and 24 colleagues [2007]. Icarus 189, 35-62, on flybys TB-T10) we present here a significantly richer dataset with, in particular, more data at high northern and southern latitudes so that the abundances inferred here at these regions are more reliable. Our enhanced high-resolution dataset allows us to infer more precisely the chemical composition of Titan all over the disk. We also include improved spectroscopic data for some molecules and updated temperature profiles. The latitudinal distributions of all of the gaseous species are inferred. We furthermore test vertical distributions essentially for acetylene (C2H2) from CIRS limb-inferred data and from current General Circulation Models for Titan and compare our results on all the gaseous abundances with predictions from 1-D photochemical-radiative models to check the reliability of the chemical reactions and pathways.

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