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Titan trace gaseous composition from CIRS at the end of the Cassini-Huygens prime mission |
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| Authors: | A Coustenis DE Jennings RK Achterberg S Vinatier NA Teanby RC Carlson G Bampasidis PN Romani |
| Institution: | a Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique (LESIA), Observatoire de Paris-Meudon, 5, Place Jules Janssen, 92195 Meudon Cedex, France b NASA/Goddard Space Flight Center, Code 693, Greenbelt, MD 20771, USA c Department of Astronomy, University of Maryland, College Park, MD 20742, USA d Department of Planet. Science, University of Arizona, Tucson, AZ 85721, USA e Laboratoire de Météorologie Dynamique, IPSL, CNRS/UPMC, F-75252 Paris Cedex 05, France f AOPP, Department of Physics, Univ. of Oxford, Clarendon Lab., Parks Rd., Oxford OX1 3PU, UK g IACS, Catholic University of America, and NASA/Goddard Space Flight Center, Planet. Systems Lab. - Code 693.0, Greenbelt, MD 20771, USA h Muséum de l’Histoire Naturelle, Case Postale 52-61, rue Buffon, F-75005 Paris, France i Faculty of Physics, National and Kapodistrian Univ. of Athens, Panepistimiopolis, GR-15783 Zographos, Athens, Greece |
| Abstract: | 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. |
| Keywords: | Titan Abundances atmospheres Organic chemistry Satellites atmospheres Spectroscopy Atmospheres chemistry Atmospheres composition Satellites composition |
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