In-cloud processes of methacrolein under simulated conditions – Part 2: Formation of secondary organic aerosol - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2009

In-cloud processes of methacrolein under simulated conditions – Part 2: Formation of secondary organic aerosol

Résumé

The fate of methacrolein in cloud evapo-condensation cycles was experimentally investigated. To this end, aqueous-phase reactions of methacrolein with OH radicals were performed (as described in Liu et al., 2009), and the obtained solutions were then nebulized and dried into a mixing chamber. ESI-MS and ESI-MS/MS analyses of the aque-ous phase composition denoted the formation of high molecular weight multifunctional products containing hydroxyl, carbonyl and carboxylic acid moieties. The time profiles of these products suggest that their formation can imply radical pathways. These high molecular weight organic products are certainly responsible for the formation of secondary organic aerosol (SOA) observed during the nebulization experiments. The size, number and mass concentration of these particles increased significantly with the reaction time: after 22 h of reaction, the aerosol mass concentration was about three orders of magnitude higher than the initial aerosol quantity. The evaluated SOA yield ranged from 2 to 12%. These yields were confirmed by another estimation method based on the hygroscopic and volatility properties of the obtained SOA measured and reported by Michaud et al. (2009). These results provide, for the first time to our knowledge, strong experimental evidence that cloud processes can act, through photooxidation reactions, as important contributors to secondary organic aerosol formation in the troposphere.
Fichier principal
Vignette du fichier
acp-9-5107-2009.pdf (1.26 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01686848 , version 1 (17-01-2018)

Identifiants

Citer

Imad El Haddad, Yao Liu, L. Nieto-Gligorovski, Vincent Michaud, Brice Temime-Roussel, et al.. In-cloud processes of methacrolein under simulated conditions – Part 2: Formation of secondary organic aerosol. Atmospheric Chemistry and Physics, 2009, 9 (14), pp.5107-5117. ⟨10.5194/acp-9-5107-2009⟩. ⟨hal-01686848⟩
475 Consultations
80 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More