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Dissolution process of atmospheric aerosol particles into cloud droplets; Processus de dissolution des aerosols atmospheriques au sein des gouttes d'eau nuageuses

Abstract

Clouds affect both climate via the role they play in the Earth's radiation balance and tropospheric chemistry since they are efficient reaction media for chemical transformation of soluble species. Cloud droplets are formed in the atmosphere by condensation of water vapour onto aerosol particles, the cloud condensation nuclei (CCN). The water soluble fraction of these CCN governs the cloud micro-physics, which is the paramount factor playing on the radiative properties of clouds. Moreover, this soluble fraction is the source of species imply in the oxidation/reduction reactions in the aqueous phase. Thus, it is of particular importance to understand the process controlling the solubilization of aerosols in the cloud droplets. The main purpose of this work is to investigate experimentally and theoretically the dissolution of particles incorporated in the aqueous phase. From the studies conducted up to now, we have identify several factors playing on the dissolution reaction of aerosols. However, the quantification of the effects of these factors is difficult since the current means of study are not adapted to the complexity of cloud systems. First, this work consisted to perform a experimental system, compound by an open flow reactor, enabling to follow the kinetic of dissolution in conditions representative  More>>
Authors:
Publication Date:
Jan 15, 2001
Product Type:
Thesis/Dissertation
Report Number:
FRNC-TH-6720
Reference Number:
RN07000096; TVI: 0610
Resource Relation:
Other Information: TH: These geologie sur la geochimie; [195 refs.]
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 54 ENVIRONMENTAL SCIENCES; CLOUDS; AEROSOLS; ACID RAIN; PH VALUE; SOLUBILITY; DISSOLUTION; PRECIPITATION; HYDROXIDES; ANIONS; FLY ASH; CHEMICAL REACTION KINETICS; ICP MASS SPECTROSCOPY; CARBONATES; TRACE AMOUNTS; X-RAY DIFFRACTION; OPTICAL MICROSCOPY; ATMOSPHERIC CHEMISTRY; OXONIUM IONS
OSTI ID:
20802756
Research Organizations:
Paris-7 Univ. Denis Diderot, Lab. Interuniversitaire des Systemes Atmospheriques, 75 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR0603404
Availability:
Commercial reproduction prohibited; OSTI as DE20802756
Submitting Site:
FR
Size:
225 pages
Announcement Date:
Dec 20, 2006

Citation Formats

Desboeufs, K. Dissolution process of atmospheric aerosol particles into cloud droplets; Processus de dissolution des aerosols atmospheriques au sein des gouttes d'eau nuageuses. France: N. p., 2001. Web.
Desboeufs, K. Dissolution process of atmospheric aerosol particles into cloud droplets; Processus de dissolution des aerosols atmospheriques au sein des gouttes d'eau nuageuses. France.
Desboeufs, K. 2001. "Dissolution process of atmospheric aerosol particles into cloud droplets; Processus de dissolution des aerosols atmospheriques au sein des gouttes d'eau nuageuses." France.
@misc{etde_20802756,
title = {Dissolution process of atmospheric aerosol particles into cloud droplets; Processus de dissolution des aerosols atmospheriques au sein des gouttes d'eau nuageuses}
author = {Desboeufs, K}
abstractNote = {Clouds affect both climate via the role they play in the Earth's radiation balance and tropospheric chemistry since they are efficient reaction media for chemical transformation of soluble species. Cloud droplets are formed in the atmosphere by condensation of water vapour onto aerosol particles, the cloud condensation nuclei (CCN). The water soluble fraction of these CCN governs the cloud micro-physics, which is the paramount factor playing on the radiative properties of clouds. Moreover, this soluble fraction is the source of species imply in the oxidation/reduction reactions in the aqueous phase. Thus, it is of particular importance to understand the process controlling the solubilization of aerosols in the cloud droplets. The main purpose of this work is to investigate experimentally and theoretically the dissolution of particles incorporated in the aqueous phase. From the studies conducted up to now, we have identify several factors playing on the dissolution reaction of aerosols. However, the quantification of the effects of these factors is difficult since the current means of study are not adapted to the complexity of cloud systems. First, this work consisted to perform a experimental system, compound by an open flow reactor, enabling to follow the kinetic of dissolution in conditions representative of cloud. This experimental device is used to a systematic characterisation of the known factors playing on the dissolution, i.e. pH, aerosol nature, aerosol weathering... and also for the identification and the quantification of the effects of other factors: ionic strength, acid nature, clouds processes. These experiments gave quantitative results, which are used to elaborate a simple model of aerosol dissolution in the aqueous phase. This model considers the main factors playing on the dissolution and results in a general mechanism of aerosol dissolution extrapolated to the cloud droplets. (author)}
place = {France}
year = {2001}
month = {Jan}
}