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Epistemic bimodality and kinetic hypersensitivity in photochemical models of Titan's atmosphere |
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| Authors: | M Dobrijevic N Carrasco E Hébrard P Pernot |
| Institution: | a Laboratoire d’Astrophysique de Bordeaux, Université de Bordeaux 1, 33270 Floirac, France b CNRS/INSU, UMR 5804, BP 89, F-33271 Floirac Cedex, France c Laboratoire de Chimie Physique, CNRS, UMR 8000, Orsay F-91405, France d Université Paris-Sud 11, Orsay F-91405, France e Laboratoire Interuniversitaire des Systèmes Atmosphériques, CNRS, UMR 7583, Université Paris 7-12, Créteil F-94010, France f Service d’Aéronomie, Université de Versailles Saint Quentin, CNRS, IPSL, BP 3, Verrières le Buisson F-91371, France |
| Abstract: | We show that photochemical models of Titan's atmosphere can give rise to bimodal distributions in the abundances of some 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 some compounds are 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. |
| Keywords: | Bimodality Bistability Sensitivity analysis Titan Photochemistry |
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