Journal
PLANETARY AND SPACE SCIENCE
Volume 56, Issue 12, Pages 1630-1643Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2008.05.016
Keywords
Bimodality; Bistability; Sensitivity analysis; Titan; Photochemistry
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We show that photochemical models of Titan's atmosphere can give rise to bimodal distributions in the abundances of sonic major compounds, like C2H2 and C2H4. Sensitivity analysis enabled us to identify the causes and conditions of this bimodality. We propose several methods to control this behavior in photochemical models. In particular, we point out the importance of two key reactions and the needs for a critical evaluation of the kinetic data. We also show that the abundances of sonic compounds Lire hypersensitive to the ratio [CH4]/[H], suggesting that a time-dependent variation of this ratio might lead to a real bistability in the high atmosphere of Titan. (C) 2008 Elsevier Ltd. All rights reserved.
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