Title: Secondary organic aerosol formation from gasoline vehicle emissions in a new mobile environmental reaction chamber
Authors: PLATT StephenHADDAD ImadZARDINI ALESSANDROCLAIROTTE MichaelASTORGA-LLORENS MariaWOLF RobertSLOWIK JayTEMIME-ROUSSEL BriceMARCHAND NicholasJEZEK IrenaDRINOVEC LukaMOCNIK GrisaMOEHLER ORICHTER HBARMET P.BIANCHI FBALTENSPERGER UrsPREVOT Andre S. H.
Citation: ATMOSPHERIC CHEMISTRY AND PHYSICS vol. 13 no. 18 p. 9141– 9158
Publisher: COPERNICUS GESELLSCHAFT MBH
Publication Year: 2013
JRC N°: JRC84286
ISSN: 1680-7316
URI: http://www.atmos-chem-phys.net/13/9141/2013/acp-13-9141-2013.pdf
http://publications.jrc.ec.europa.eu/repository/handle/JRC84286
DOI: 10.5194/acp-13-9141-2013
Type: Articles in periodicals and books
Abstract: We present a new mobile environmental reaction chamber for the simulation of the atmospheric aging of different emissions sources without limitation from the instruments or facilities available at any single site. Photochemistry is simulated using a set of 40 UV lights (total power 4 KW). Characterisation of the emission spectrum of these lights shows that atmospheric aging of emissions may be simulated over a range of temperatures (-7 to 25°C). A photolysis rate of NO2, JNO2, of (8.0±0.7)×10-3 s-1 was determined at 25°C. We demonstrate the utility of this new system by presenting results on the aging (OH=12×106 cm-3h) of emissions from a modern (Euro 5) gasoline car operated during a driving cycle (New European Driving Cycle, NEDC) on a chassis dynamometer in a vehicle test cell. Emissions from the entire NEDC were sampled and aged in the chamber. A thorough investigation of the composition of the gas phase emissions suggests that the observed SOA is from previously unconsidered precursors and processes. This large enhancement in PM mass from gasoline vehicle aerosol emissions due to SOA formation, if it occurs across a wider range of gasoline vehicles, would have significant implications for our understanding of the contribution of on-road gasoline vehicles to ambient aerosols.
JRC Directorate:Energy, Transport and Climate

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