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| Titel |
Receptor modelling of boreal wildfire associated PM2.5 in Halifax, Nova Scotia, Canada |
| VerfasserIn |
Mark D. Gibson, James Kuchta, Lucy Chisholm, Tom Duck, Jason Hopper, Stephen Beauchamp, David Waugh, Gavin King, Jeffrey Pierce, Zhengyan Li, Richard Leaitch, Tony J. Ward, Paul I. Palmer |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250073022
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| Zusammenfassung |
| During the summer of 2011, 42 days of contiguous PM2.5 filter samples were collected in
Halifax, Nova Scotia as part of an international study (BORTAS) to study boreal biomass
burning plumes as they travel across Canada towards the Atlantic. This international study
was led by the University of Edinburgh in collaboration with partners in North America and
Europe. The aim of the PM2.5 filter sampling was to apportion the source contribution
to the total PM2.5 mass concentration in Halifax for the purposes of BORTAS.
Sampling was conducted on the roof of a Dalhousie University building at a height of
15Â m. The building is located in a residential area of Halifax. Continuous black
carbon (BC) was measured using a Magee AE-42 aethalometer. Continuous PM1.0
associated organic carbon was measured using an Aerodyne, Aerosol Chemical
Speciation Monitor. Daily teflon filter samples were collected for the determination
of fine (PM2.5) and coarse (PM2.5-10) particulate mass. An additional, daily,
nylon filter was used for the determination of PM2.5 cations and anions by IC. The
PM2.5 teflon filter was analysed for 33 metals by XRF and 10 trace metals by
ICP-MS. A quartz filter was analysed for the biomass burning marker levoglucosan by
GC-MS following derivatization. Excellent agreement (R2 = 0.88) was observed
between continuous and filter based measurements with a gradient of 2.76. Median
(min:max) fine and coarse PM mass concentrations were found to be 3.9 (0.08:13.7)
and 8.5 (0.6:24.9) μg-m3 respectively. Median (min:max) continuous BC = 0.27
(0.009:3.20); SO4 = 0.10 (0:2.0); NO3 = 0.033 (0:0.45); OC = 0.80 (0:14.6);
NH4 = 0.054 (0:0.79); Cl = 0.002 (0:0.09) μg-m3 respectively. Receptor modelling was
conducted using two methods, USEPA Positive Matrix Factorization and USEPA
Chemical Mass Balance. The PMF results showed percent source contribution from
biomass burning in Halifax to be 8.0%, vehicles 9.9%, ship emissions 6.0%, surficial
material 11.9%, long-range secondary ions 64.1%, sea salt 0.1%. A comparison of
PMF and CMB model output will be presented. These data provide insight into the
source contribution of boreal wildfire plumes to surface PM2.5 mass in Halifax. |
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