HR: 1340h
AN: A33D-1551    [Abstracts]
TI: VOC Measurements In Egbert, Ontario. Characterization Of Sources And Chemical Transformations Of Gas-Phase Species
AU: * Vlasenko, A
EM: avlasenk@chem.utoronto.ca
AF: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
AU: Chang, R
EM: rchang@chem.utoronto.ca
AF: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
AU: Shantz, N
EM: nshantz@chem.utoronto.ca
AF: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
AU: Shantz, N
EM: nshantz@chem.utoronto.ca
AF: Science and Technology Branch, Environment Canada, 4905 Dufferin Street, Toronto, ON M3H 5T4, Canada
AU: Sjostedt, S
EM: ssjosted@chem.utoronto.ca
AF: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
AU: Slowik, J
EM: jslowik@chem.utoronto.ca
AF: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
AU: Abbatt, J
EM: jabbatt@chem.utoronto.ca
AF: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
AU: Macdonald, A
EM: AnneMarie.Macdonald@ec.gc.ca
AF: Science and Technology Branch, Environment Canada, 4905 Dufferin Street, Toronto, ON M3H 5T4, Canada
AU: Brickell, P
EM: Peter.Brickell@ec.gc.ca
AF: Science and Technology Branch, Environment Canada, 4905 Dufferin Street, Toronto, ON M3H 5T4, Canada
AU: Leaitch, R
EM: Richard.Leaitch@ec.gc.ca
AF: Science and Technology Branch, Environment Canada, 4905 Dufferin Street, Toronto, ON M3H 5T4, Canada
AB: A number of volatile organic compounds (VOC) were measured at the Environment Canada Centre for Atmospheric Research Experiments in Southern Ontario as a part of the Egbert 2007 study. The sampling location is situated in a rural area 70 km north of Toronto. Measurements were performed in May and June 2007. During this time period the site experienced influence by polluted urban/industrial/traffic air masses and relatively clean continental air. VOC measurements were conducted using various techniques (Gas chromatography/flame ionization detection, Hantsch monitor and Proton transfer reaction mass spectrometry) and some species were detected by more than one method. The results of the intercomparison will be presented. Preliminary data analyses showed that VOC concentrations exhibited a significant time variation associated with air origin and photochemical air aging. The toluene to benzene ratio was used to identify traffic-related VOC sources. Under certain meteorological conditions during night time this ratio reached high values (>4) indicating non processed emissions transported to the sampling site. Apart from anthropogenic influence, biogenic VOC emissions were observed, and will be contrasted to the more polluted periods. During these episodes higher concentrations of isoprene and monoterpenes were detected.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting