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Mesures expérimentales dans les basses couches de l'atmosphère tropicale et insulaire (Guadeloupe) : Micro-météorologie et composition chimique des masses d'air nocturnes en zone de mangrove

Christophe d'Alexis 1 
1 Groupe aérosols
LARGE - Laboratoire de Recherche en Géosciences et Energies
Abstract : The presence of obstacles met in natural environment by the flow, influences the dispersion of air pollutants which it carries. This thesis, based on spatiotemporal micro-meteorological measurements in tropical region, aims at studying the dispersion of compounds emitted by the ecosystem mangrove according to the weather conditions. At a daily scale, the meteorological analysis reveals, besides the presence of Trade Winds, the existence of thermal flows of which nocturnal thermodynamic parameters have been defined. The field observation has shown that the weak intensity of the wind disadvantages the dispersion of compounds emitted during the night. At a finer scale, the existence of a spectral gap separating large scale phenomena of those related to turbulence has been demonstrated. These last ones were treated by spectral and statistical approaches to quantify the turbulent fluxes of momentum and sensible heat during the night, for an averaged duration of 13 minutes. The stratification of the surface layer has been considered and determined by Monin-Obukhov similarity theory. The measurements acquired at night and the application of Kolmogorov theory allowed us to deduct the dissipation rate of energy and the size of the vortices at 5.5 meters in height. This work has also led us, by gas chromatography coupled to mass spectrometry, to identify, in mangrove, sulphurated volatil organic compounds, organohalogen, BTEX, ... All these results will later serve to feed dispersion models related to the studied ecosystem.
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Submitted on : Friday, February 3, 2012 - 4:46:30 AM
Last modification on : Tuesday, April 16, 2019 - 8:52:05 PM
Long-term archiving on: : Friday, May 4, 2012 - 2:21:39 AM

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  • HAL Id : tel-00665882, version 1

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Christophe d'Alexis. Mesures expérimentales dans les basses couches de l'atmosphère tropicale et insulaire (Guadeloupe) : Micro-météorologie et composition chimique des masses d'air nocturnes en zone de mangrove. Océan, Atmosphère. Université des Antilles et de la Guyane, 2011. Français. ⟨NNT : 11AGUY0438⟩. ⟨tel-00665882⟩

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