Etude du transport isentrope de la vapeur d'eau dans la haute troposphère et la basse stratosphère

Nadège Montoux 1, 2
2 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Water vapour is a primordial constituent of the atmosphere in view of its role on the earth surface temperature and its impact on the protective ozone layer. The ozone mixing ratios in stratosphere (~12 up to 50 km high) showed however high tendencies with great disagreements between the instruments. The first part of this thesis contributes to the evaluation of new instruments in the tropical higher troposphere and lower stratosphere. Bias between the instruments remain high and variabilities differ prevent from combining the data together to obtain long term tendencies. However some instruments could be used in scientific studies. The second part of this thesis study the mechanisms injecting water vapour in the lower stratosphere witch could explain a part of the tendencies observed. Among them, the quasi-horizontal meridian adiabatic exchanges between the subtropical troposphere (0-12 km) and the midlatitude stratosphere, not enough researched, is on the scope of this thesis. Thus an adiabatic model is adapted to transport water in its three phases with a simplified microphysical model. Many initialisations of the water vapour field are tested. Then the model is applied to a study case above Europe to quantify the transport of water vapour. The model is able to reproduce the observed cirrus and shows that this transport is as important as other transports as monsoon or deep convection.
Document type :
Theses
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https://tel.archives-ouvertes.fr/tel-00446926
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Submitted on : Wednesday, January 13, 2010 - 5:00:54 PM
Last modification on : Friday, January 10, 2020 - 3:42:30 PM
Long-term archiving on: Thursday, June 17, 2010 - 8:22:17 PM

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  • HAL Id : tel-00446926, version 1

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Nadège Montoux. Etude du transport isentrope de la vapeur d'eau dans la haute troposphère et la basse stratosphère. Océan, Atmosphère. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00446926⟩

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