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Etude de la photochimie de Vénus à l'aide d'un modèle de circulation générale

Aurélien Stolzenbach 1
1 IMPEC - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : The study of Venus is particularly interesting on many aspects. Venus shares many features with the Earth, similar size and composition. For, despite some common elements, these planets are fundamentally different in our time. Venus has an atmosphere a hundred times denser at the surface than the Earth and is composed essentially of carbon dioxide where the earth's atmosphere is composed of a mixture of molecular nitrogen and molecular oxygen. The chemical composition of the Venusian atmosphere poses many problems for chemist. Venus is the subject of modern observations from Earth and then through space missions of the 70 ESA mission launched in 2005 which remained in orbit around Venus until December 2014. the explanation of the distribution and concentrations measured chemical species is studied by a community of modelers in parallel observations. However, these models were forced to use 1D models that contained numerous parameterization. During my PhD I have updated a chemical model developed at LATMOS, and developed a model of the Venus clouds which have both been introduced to Venus 3D GCM developed at LMD. It allows to apply in 3D the latest hypothesis about the Venusian chemical cycles such as, among others, the decrease of sulfur dioxide and water vapor in the cloud layer, changes of carbon monoxide in latitudes, the stability of carbon dioxide, the composition of clouds droplets and the condensed mass in those clouds.
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2016PA066413.pdf
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  • HAL Id : tel-01415771, version 3

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Aurélien Stolzenbach. Etude de la photochimie de Vénus à l'aide d'un modèle de circulation générale. Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]. Université Pierre et Marie Curie - Paris VI, 2016. Français. ⟨NNT : 2016PA066413⟩. ⟨tel-01415771v3⟩

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