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| Titel |
Identifying the sources driving observed PM2.5 temporal variability over Halifax, Nova Scotia, during BORTAS-B |
| VerfasserIn |
M. D. Gibson, J. R. Pierce, D. Waugh, J. S. Kuchta, L. Chisholm, T. J. Duck, J. T. Hopper, S. Beauchamp, G. H. King, J. E. Franklin, W. R. Leaitch, A. J. Wheeler, Z. Li, G. A. Gagnon, P. I. Palmer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 14 ; Nr. 13, no. 14 (2013-07-30), S.7199-7213 |
| Datensatznummer |
250018787
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| Publikation (Nr.) |
 copernicus.org/acp-13-7199-2013.pdf |
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| Zusammenfassung |
| 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 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 and a
vital comparative data set for the other collocated ground-based
observations of atmospheric composition made during BORTAS-B. |
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