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Environ Sci Technol

Title:		Direct evidence of atmospheric secondary organic aerosol formation in forest atmosphere through heteromolecular nucleation
Author(s):		Kavouras IG; Stephanou EG;
Address:		"Environmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, GR-71409 Heraklion, Greece"
Journal Title:		Environ Sci Technol
Year:		2002
Volume:		36
Issue:		23
Page Number:		5083 - 5091
DOI:		10.1021/es025811c
ISSN/ISBN:		0013-936X (Print) 0013-936X (Linking)
Abstract:		"Atmospheric aerosols play a central role in climate and atmospheric chemistry. Organic matter frequently composes aerosol major fraction over continental areas. Reactions of natural volatile organic compounds, with atmospheric oxidants, are a key formation pathway of fine particles. The gas and particle atmospheric concentration of organic compounds directly emitted from conifer leaf epicuticular wax and of those formed through the photooxidation of alpha- and beta-pinene were simultaneously collected and measured in a conifer forest by using elaborated sampling and GC/ MS techniques. The saturation concentrations of acidic and carbonyl photooxidation products were estimated, by taking into consideration primary gas- and particle-phase organic species. Primary organic aerosol components represented an important fraction of the atmospheric gas-phase organic content Consequently, saturation concentrations of photooxidation products have been lowered facilitating new particle formation between molecules of photooxidation products and semi-volatile organic compounds. From the measured concentrations of the above-mentioned compounds, saturation concentrations (Csat,i) of alpha- and beta-pinene photooxidation products were calculated for nonideal conditions using a previously developed absorptive model. The results of these calculations indicated that primarily emitted organic species and ambient temperature play a crucial role in secondary organic aerosol formation"
Keywords:		"*Aerosols Air Pollutants/*chemistry Environmental Monitoring Gases *Models, Theoretical Organic Chemicals Oxidation-Reduction Photochemistry Temperature *Trees Volatilization;"
Notes:		"MedlineKavouras, Ilias G Stephanou, Euripides G eng Research Support, Non-U.S. Gov't 2003/01/14 Environ Sci Technol. 2002 Dec 1; 36(23):5083-91. doi: 10.1021/es025811c"