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| Titel |
Air quality monitoring in communities of the Canadian Arctic during the high shipping season with a focus on local and marine pollution |
| VerfasserIn |
A. A. Aliabadi, R. M. Staebler, S. Sharma |
| 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 ; 15, no. 5 ; Nr. 15, no. 5 (2015-03-09), S.2651-2673 |
| Datensatznummer |
250119507
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| Publikation (Nr.) |
 copernicus.org/acp-15-2651-2015.pdf |
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| Zusammenfassung |
| The Canadian Arctic has experienced decreasing sea ice extent and
increasing shipping activity in recent decades. While there are
economic incentives to develop resources in the north, there are
environmental concerns that increasing marine traffic will
contribute to declining air quality in northern communities. In an
effort to characterize the relative impact of shipping on air
quality in the north, two monitoring stations have been installed in
Cape Dorset and Resolute, Nunavut, and have been operational since
1 June 2013. The impact of shipping and other sources of emissions
on NOx, O3, SO2, BC, and
PM2.5 pollution have been characterized for the 2013
shipping season from 1 June to 1 November. In addition, a high-resolution Air Quality Health Index (AQHI) for both sites was
computed. Shipping consistently increased O3 mixing ratio
and PM2.5 concentration. The 90% confidence interval
for mean difference in O3 mixing ratio between ship- and no ship-influenced air masses were up to 4.6–4.7 ppb and
2.5–2.7 ppb for Cape Dorset and Resolute, respectively. The
same intervals for PM2.5 concentrations were up to
1.8–1.9 μg m−3 and
0.5–0.6 μg m−3. Ship-influenced air masses
consistently exhibited an increase of 0.1 to
0.3 in the high-resolution AQHI compared to no ship-influenced air
masses. Trajectory cluster analysis in combination with ship traffic
tracking provided an estimated range for percent ship contribution
to NOx, O3, SO2, and PM2.5 that
were 12.9–17.5 %, 16.2–18.1 %, 16.9–18.3 %, and
19.5–31.7 % for Cape Dorset and 1.0–7.2 %, 2.9–4.8 %,
5.5–10.0 %, and 6.5–7.2 % for Resolute during the 2013
shipping season. Additional measurements in Resolute suggested that
percent ship contribution to black carbon was 4.3–9.8 % and
that black carbon constituted 1.3–9.7 % of total PM2.5 mass in ship plumes. Continued air quality
monitoring in the above sites for future shipping seasons will
improve the statistics in our analysis and characterize
repeating seasonal patterns in air quality due to shipping, local
pollution, and long-range transport. |
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