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ETUDE DE L'ACTIVATION DES NOYAUX DE CONDENSATION : MESURE, ANALYSE ET DEVELOPPEMENT INSTRUMENTAL.

Abstract : The goal of this thesis is to improve the understanding of the interactions between aerosols and clouds. With this intention, we have to cover as broad and various subjects as instrumental development, statistical analysis and modeling. Thus, we were brought to install and develop a sampler of cloudy air at the puy of Dome observatory. It now allows a continuous sampling even in cloudy conditions. It was then followed with two campaign of measurements during the winters 2000 and 2001 wich end in a collection of more than 600000 samples. Thanks to this broad panel of weather conditions and sources of air mass, we could quantify one of the key points of relationship between aerosol and cloud studies by obtaining a relationship between the particle total concentration and, on the one hand the cloud droplet concentration, and on the other hand the cloud effective radius for constant liquid water contents. Moreover, the use of a cloud droplet activation model called ExMix enabled us to have a better comprehension of particles incorporation into droplets trends. In this manner, we compared modeled and measured trends with increasing water contents and with increasing cloud effective radius for constant liquid water contents. However, that raised the important lack of aerosol physicochemical measurement with a higher frequency we can get until now. It shows, for example, a need to better take into account the aerosol organic phase. That's why an analyzer of volatility and granulometry of aerosols has been developed, built and tested during the last part of this thesis.
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Contributor : Regis Dupuy <>
Submitted on : Sunday, September 27, 2009 - 7:31:42 PM
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R. Dupuy. ETUDE DE L'ACTIVATION DES NOYAUX DE CONDENSATION : MESURE, ANALYSE ET DEVELOPPEMENT INSTRUMENTAL.. Océan, Atmosphère. Université Blaise Pascal - Clermont-Ferrand II, 2003. Français. ⟨tel-00420048⟩

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