LOISON, J.C.; HÉBRARD, Eric; DOBRIJEVIC, M.; HICKSON, K.M.; CARALP, F.; HUE, V.; GRONOFF, G.; VENOT, O.; BÉNILAN, Y.

doi:10.1016/j.icarus.2014.09.039

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LOISON, J.C.
Institut des Sciences Moléculaires [ISM]

HÉBRARD, Eric
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Université Sciences et Technologies - Bordeaux 1 [UB]
Institut de recherche en astrophysique et planétologie [IRAP]

DOBRIJEVIC, M.
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Université Sciences et Technologies - Bordeaux 1 [UB]
ASP 2015

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Icarus. 2015-02, vol. 247, p. 218-247

Elsevier

Résumé en anglais

The photochemistry of N2 and CH4 in the atmosphere of Titan leads to a very rich chemistry which is not well understood. The aim of our study is to improve our understanding of the production of nitrogen compounds and to predict the abundances of those with high molar mass with better accuracy. We have made a careful investigation of the neutral nitrogen photochemistry to improve current chemical schemes including the most abundant species and the most efficient reactions. We also studied the propagation of uncertainties on rate constants in our model and determined the key reactions from a global sensitivity analysis. Our photochemical model contains 124 species, 60 of which are nitrogen containing compounds, and 1141 reactions. Our results are in reasonable agreement with Cassini/INMS data in the higher atmosphere but our model overestimates the mole fractions of several nitriles in the lower stratosphere. New species such as CH3C3N and C3H7CN could be relatively abundant in Titan's atmosphere. Uncertainties on some nitrogen compounds are important and further studies of the key reactions that we have identified are needed to improve the predictivity of photochemical models. Meridional transport is expected to be an efficient process to govern the abundances of several nitriles in the lower stratosphere.< Réduire

Mots clés en anglais

chemistry

Atmospheres

composition

Titan

Photochemistry

Organic chemistry

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The neutral photochemistry of nitriles, amines and imines in the atmosphere of Titan

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