Isotopes in Titan's atmosphere and the history of methane

Details Isotopes in Titan's atmosphere and the history of methane Isotopes in Titan's atmosphere and the history of methane

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..998m&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.998

Computer Science

Scientific paper

We present a re-analysis of the Cassini Ion Neutral Mass Spectrometer (INMS) isotope ratios based on updated sensitivity values [1] and apply a basic atmospheric model to compare the INMS measurements with the revised Huygens Gas Chromatograph Mass Spectrometer (GCMS) isotopic ratios for 14N/15N in N2 and 12C/13C in CH4 [2]. The revised ratios for 12C/13C in CH4 have important implications for modeling of the evolution of methane in Titan's atmosphere [3]. We will present updated results for the evolution of Titan's methane, including: (1) upper limits for the time scale over which methane has been present in the atmosphere; and (2) lower limits for the D/H ratio in the methane in Titan's interior.

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