Jean-Loup Bertaux
Space Science Institute
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Featured researches published by Jean-Loup Bertaux.
Nature | 2008
Franck Lefèvre; Jean-Loup Bertaux; R. Todd Clancy; Thérèse Encrenaz; Kelly Fast; Francois Forget; Sebastien Lebonnois; Franck Montmessin; S. Perrier
Hydrogen radicals are produced in the martian atmosphere by the photolysis of water vapour and subsequently initiate catalytic cycles that recycle carbon dioxide from its photolysis product carbon monoxide. These processes provide a qualitative explanation for the stability of the atmosphere of Mars, which contains 95 per cent carbon dioxide. Balancing carbon dioxide production and loss based on our current understanding of the gas-phase chemistry in the martian atmosphere has, however, proven to be difficult. Interactions between gaseous chemical species and ice cloud particles have been shown to be key factors in the loss of polar ozone observed in the Earth’s stratosphere, and may significantly perturb the chemistry of the Earth’s upper troposphere. Water-ice clouds are also commonly observed in the atmosphere of Mars and it has been suggested previously that heterogeneous chemistry could have an important impact on the composition of the martian atmosphere. Here we use a state-of-the-art general circulation model together with new observations of the martian ozone layer to show that model simulations that include chemical reactions occurring on ice clouds lead to much improved quantitative agreement with observed martian ozone levels in comparison with model simulations based on gas-phase chemistry alone. Ozone is readily destroyed by hydrogen radicals and is therefore a sensitive tracer of the chemistry that regulates the atmosphere of Mars. Our results suggest that heterogeneous chemistry on ice clouds plays an important role in controlling the stability and composition of the martian atmosphere.
41st Annual Meeting of the Division for Planetary Sciences (DPS) | 2009
Franck Montmessin; Jean-Loup Bertaux; Franck Lefèvre; Ann Carine Vandaele; Oleg Korablev; Emmanuel Marcq; Anna Fedorova; Emilie Royer; Arnaud Mahieux; Denis Belyaev; Valérie Wilquet
39th COSPAR Scientific Assembly | 2012
Jean-Yves Chaufray; François Leblanc; Manabu Yagi; Jean-Loup Bertaux; Eric Quémerais; Ronan Modolo; Francisco Gonzalez-Galindo; Miguel Angel Lopez-Valverde; Francois Forget; John T. Clarke; M. S. Chaffin; Nicholas M. Schneider
Archive | 2010
B. Gondet; J.-P. Bibring; Jean-Loup Bertaux; Franck Montmessin
Archive | 2009
C. Mazelle; C. Bertucci; Jean Gabriel Trotignon; Katherine M. Sauer; Jean-Loup Bertaux; Jean-Yves Chaufray
Fourth International Workshop on the Mars Atmosphere: Modelling and Observations | 2011
Constantino Listowski; Anni Määttänen; Franck Montmessin; Franck Lefèvre; Jean-Loup Bertaux
Archive | 2008
Anna Fedorova; Oleg Korablev; Jean-Loup Bertaux; Franck Montmessin; Eric Villard; Denis V. Belyaev
Sixth international workshop on the Mars atmosphere: Modelling and observations | 2017
D. S. Betsis; Anna Fedorova; Oleg Korablev; Jean-Loup Bertaux; Franck Montmessin
47th Lunar and Planetary Science Conference | 2016
Jean-Loup Bertaux; Franck Montmessin; B. Gondet; J.-P. Bibring; Aurélie Reberac; Lucio Baggio
Comparative Climatology of Terrestrial Planets | 2012
Anni Määttänen; Kristell Pérot; Alain Hauchecorne; Franck Montmessin; Jean-Loup Bertaux