HR: 0830h
AN: A11E-0035    [PDF]
TI: Application of Size-resolved and Chemically-speciated Particulate Matter Emission Measurement Data to Air Quality Modeling in the Lower Fraser Valley
AU: * Yin, D
EM: Dazhong.Yin@nrc-cnrc.gc.ca
AF: National Research Council of Canada, Room 235, M2, 1200 Montreal Road, Ottawa, ON K1A 0R6 Canada
AU: Jiang, W
EM: Weimin.Jiang@nrc-cnrc.gc.ca
AF: National Research Council of Canada, Room 235, M2, 1200 Montreal Road, Ottawa, ON K1A 0R6 Canada
AU: Giroux, E
EM: Eric.Giroux@nrc-cnrc.gc.ca
AF: National Research Council of Canada, Room 235, M2, 1200 Montreal Road, Ottawa, ON K1A 0R6 Canada
AU: Roth, H
EM: Helmut.Roth@nrc-cnrc.gc.ca
AF: National Research Council of Canada, Room 235, M2, 1200 Montreal Road, Ottawa, ON K1A 0R6 Canada
AB: The size and composition information of aerosols in the atmosphere is critical in understanding its behavior and environmental impacts. Emission inventories usually report particulate matter (PM) as PM2.5 and PM10 respectively. In order to realistically simulate aerosol size and chemical composition variations in the air, size-resolved and chemically-speciated PM emissions are desirable. In this work, we collected measured size and chemical species distributions of PM emissions for various source categories existing in the Lower Fraser Valley (LFV) region, British Columbia. Corresponding source category codes (SCCs) were assigned to the collected data. A SCC based database was built accordingly. A software package was developed and used to process the data to generate size-segregated chemical speciation profiles for the SCCs of PM emissions in the LFV region. These profiles were used in the emission processing stream to produce size-resolved and chemically-speciated PM emissions. The resulting PM emissions were utilized by Models3/CMAQ in an air quality modeling study in the LFV region. In Models3/CMAQ, aerosols are represented as a superposition of three lognormal size-distributions named Aitken mode, accumulation mode and coarse mode. A methodology was developed to allocate emissions of different PM species in various size bins to model species in the three modes, based on the modeled ambient particle size distributions. The model results with and without size-resolved, chemically-speciated PM emissions showed significant differences with respect to spatial and temporal distributions of modeled aerosol loading in the LFV region. Depending on the modeled PM species, the time averaged concentrations in the LFV from the two results can differ by orders of magnitude. Using the size resolved, chemically speciated PM emissions introduced relative changes in the domain averages of the modeled fine PM and coarse PM concentrations ranging from 120% to -40% and 700% to -10%, respectively. The size resolved and speciated PM emissions also showed positive impacts on the model performance.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting