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| Titel |
Source apportionment of speciated PM2.5 over Halifax, Nova Scotia, during BORTAS-B, using pragmatic mass closure and principal component analysis |
| 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, Jan Haelssig, 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 |
250082389
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| Zusammenfassung |
| During BORTAS-B, 42 days of contiguous PM2.5 filter samples were collected during the
summer of 2011 in Halifax, Nova Scotia. The aim of the PM2.5 filter sampling was to
apportion the source contribution to the total PM2.5 mass concentration in Halifax to inform
and validate other surface measurements and chemical transport models related to
BORTAS-B. Sampling was conducted on the roof of a Dalhousie University building at a
height of 15 m. The building is located in a residential area of Halifax. Continuous black
carbon (BC) was measured using a Magee AE-42 aethalometer. Continuous organic carbon
was measured using an Aerodyne, Aerosol Chemical Speciation Monitor. Daily
teflon filter samples were collected for the determination of fine particulate with
a median aerodynamic diameter less than or equal to 2.5 microns (PM2.5). 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. The biomass burning marker levoglucosan was
analysed by GC-MS following derivatization. Excellent agreement (R2 = 0.88) was
observed between continuous and filter based measurements with a gradient of
2.76. The median (min : max) PM2.5 mass concentration during BORTAS-B = 3.9
(0.08 : 13.7) μg-m3. The median (min : max) continuous BC = 0.39 (0.12 : 1.03);
SO4 = 0.47 (0.14 : 5.59); NO3 = 0.067 (0.007 : 0.64); OC = 0.77 (0.18 : 2.77);
NH4 = 0.15 (0:003 : 1.45); Cl = 0.011 (0.0019 : 0.32); Fe = 0.018 (0.0011
: 0.097); Al = 0.011 (0.0091 : 0.086); Si = 0.03 (0.0044 : 0.29); V = 0.0026
(0.0016 : 0.017) and Ni = 0.0007 (0.0005 : 0.0037) μg-m3 respectively. Absolute
principal component scores (APCS) and pragmatic mass closure (PMC) will be used to
identify the sources driving the observed PM2.5 variability over Halifax, during
BORTAS-B. A comparison of APCS and PMC PM2.5 receptor model output results
will be presented. These model data will provide further insight into the source
contribution to summertime surface PM2.5 mass in Halifax, Nova Scotia, Canada. |
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