Atmos. Chem. Phys. Discuss., 13, 4491-4533, 2013
www.atmos-chem-phys-discuss.net/13/4491/2013/
doi:10.5194/acpd-13-4491-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Identifying the sources driving observed PM2.5 variability over Halifax, Nova Scotia, during BORTAS-B
M. D. Gibson1, J. R. Pierce2,3, D. Waugh4, J. S. Kuchta1, L. Chisholm4, T. J. Duck2, J. T. Hopper1, S. Beauchamp4, G. H. King1, J. E. Franklin2, W. R. Leaitch5, A. J. Wheeler6, Z. Li7, G. A. Gagnon8, and P. I. Palmer9
1Department of Process Engineering and Applied Science, Dalhousie University, Halifax, Nova Scotia, Canada
2Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
3Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
4Environment Canada, Dartmouth, Nova Scotia, Canada
5Environment Canada, Toronto, Ontario, Canada
6Health Canada, Ottawa, Ontario, Canada
7College of Environmental Science and Engineering, Ocean University of China, Qingdao, China
8Department of Civil and Resources Engineering, Dalhousie University, Halifax, Nova Scotia, Canada
9School of GeoSciences, University of Edinburgh, Edinburgh, UK

Abstract. The source attribution of observed variability of total PM2.5 concentrations over Halifax, Nova Scotia was investigated between 11 July–26 August 2011 using measurements of PM2.5 mass and PM2.5 chemical composition (black carbon, organic matter, anions, cations and 33 elements). This was part of the BORTAS-B (quantifying the impact of BOReal forest fires on Tropospheric oxidants using aircraft and satellites) experiment, which investigated the atmospheric chemistry and transport of seasonal boreal wild fire emissions over eastern Canada in 2011. The US EPA Positive Matrix Factorization (PMF) receptor model was used to determine the average mass (percentage) source contribution over the 45 days, which was estimated to be: Long-Range Transport (LRT) Pollution 1.75 μg m−3 (47%), LRT Pollution Marine Mixture 1.0 μg m−3 (27.9%), Vehicles 0.49 μg m−3 (13.2%), Fugitive Dust 0.23 μg m−3 (6.3%), Ship Emissions 0.13 μg m−3 (3.4%) and Refinery 0.081 μg m−3 (2.2%). The PMF model describes 87% of the observed variability in total PM2.5 mass (bias = 0.17 and RSME = 1.5 μg m−3). The factor identifications are based on chemical markers, and they are supported by air mass back trajectory analysis and local wind direction. Biomass burning plumes, found by other surface and aircraft measurements, were not significant enough to be identified in this analysis. This paper presents the results of the PMF receptor modelling, providing valuable insight into the local and upwind sources impacting surface PM2.5 in Halifax during the BORTAS-B mission.

Citation: Gibson, M. D., Pierce, J. R., Waugh, D., Kuchta, J. S., Chisholm, L., Duck, T. J., Hopper, J. T., Beauchamp, S., King, G. H., Franklin, J. E., Leaitch, W. R., Wheeler, A. J., Li, Z., Gagnon, G. A., and Palmer, P. I.: Identifying the sources driving observed PM2.5 variability over Halifax, Nova Scotia, during BORTAS-B, Atmos. Chem. Phys. Discuss., 13, 4491-4533, doi:10.5194/acpd-13-4491-2013, 2013.
 
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