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| Titel |
Sources and contributions of wood smoke during winter in London: assessing local and regional influences |
| VerfasserIn |
L. R. Crilley, W. J. Bloss, J. Yin, D. C. S. Beddows, R. M. Harrison, J. D. Allan, D. E. Young, M. Flynn, P. Williams, P. Zotter, A. S. H. Prévôt, M. R. Heal, J. F. Barlow, C. H. Halios, J. D. Lee, S. Szidat, C. Mohr |
| 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. 6 ; Nr. 15, no. 6 (2015-03-20), S.3149-3171 |
| Datensatznummer |
250119565
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| Publikation (Nr.) |
 copernicus.org/acp-15-3149-2015.pdf |
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| Zusammenfassung |
| Determining the contribution of wood smoke to air pollution in large cities
such as London is becoming increasingly important due to the changing nature
of domestic heating in urban areas. During winter, biomass burning emissions
have been identified as a major cause of exceedances of European air quality
limits. The aim of this work was to quantify the contribution of biomass
burning in London to concentrations of PM2.5 and determine whether
local emissions or regional contributions were the main source of biomass
smoke. To achieve this, a number of biomass burning chemical tracers were
analysed at a site within central London and two sites in surrounding rural
areas. Concentrations of levoglucosan, elemental carbon (EC), organic carbon
(OC) and K+ were generally well correlated across the three sites. At
all the sites, biomass burning was found to be a source of OC and EC, with
the largest contribution of EC from traffic emissions, while for OC the
dominant fraction included contributions from secondary organic
aerosols, primary biogenic and cooking sources. Source apportionment of the
EC and OC was found to give reasonable estimation of the total carbon from
non-fossil and fossil fuel sources based upon comparison with estimates
derived from 14C analysis. Aethalometer-derived black carbon data were
also apportioned into the contributions from biomass burning and traffic
and showed trends similar to those observed for EC. Mean wood smoke mass at
the sites was estimated to range from 0.78 to 1.0 μg m−3 during the
campaign in January–February 2012. Measurements on a 160 m tower in
London suggested a similar ratio of brown to black carbon (reflecting wood
burning and traffic respectively) in regional and London air. Peaks in the
levoglucosan and K+ concentrations were observed to coincide with low
ambient temperature, consistent with domestic heating as a major
contributing local source in London. Overall, the source of biomass smoke in
London was concluded to be a background regional source overlaid by
contributions from local domestic burning emissions. This could have
implications when considering future emission control strategies during
winter and may be the focus of future work in order to better determine the
contributing local sources. |
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