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Identifying the sources driving observed PM2.5 temporal variability over Halifax, Nova Scotia, during BORTAS-B

Citation

Gibson, MD and Pierce, JR and Waugh, D and Kuchta, JS and Chisholm, L and Duck, TJ and Hopper, JT and Beauchamp, S and King, GH and Franklin, JE and Leaitch, WR and Wheeler, AJ and Li, Z and Gagnon, GA and Palmer, PI, Identifying the sources driving observed PM2.5 temporal variability over Halifax, Nova Scotia, during BORTAS-B, Atmospheric Chemistry and Physics, 13 pp. 7199-7213. ISSN 1680-7316 (2013) [Refereed Article]


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2013 Author(s) Licenced under Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

DOI: doi:10.5194/acp-13-7199-2013

Abstract

The source attribution of observed variability of total PM2.5 concentrations over Halifax, Nova Scotia, was investigated between 11 July and 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 wildfire 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 as follows: long-range transport (LRT) pollution: 1.75 g m−3 (47 %); LRT pollution marine mixture: 1.0 g m−3 (27.9 %); vehicles: 0.49 g m−3 (13.2 %); fugitive dust: 0.23 g m−3 (6.3 %); ship emissions: 0.13 g m−3 (3.4 %); and refinery: 0.081 g 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 g 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 and a vital comparative data set for the other collocated groundbased observations of atmospheric composition made during BORTAS-B

Item Details

Item Type:Refereed Article
Keywords:air quality, particulate matter, fires
Research Division:Medical and Health Sciences
Research Group:Public Health and Health Services
Research Field:Environmental and Occupational Health and Safety
Objective Division:Health
Objective Group:Public Health (excl. Specific Population Health)
Objective Field:Environmental Health
Author:Wheeler, AJ (Dr Amanda Wheeler)
ID Code:101132
Year Published:2013
Web of Science® Times Cited:19
Deposited By:Menzies Institute for Medical Research
Deposited On:2015-06-10
Last Modified:2017-11-03
Downloads:521 View Download Statistics

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