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| Titel |
A trajectory analysis of atmospheric transport of black carbon aerosols to Canadian high Arctic in winter and spring (1990–2005) |
| VerfasserIn |
L. Huang, S. L. Gong, S. Sharma, D. Lavoué, C. Q. Jia |
| 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 ; 10, no. 11 ; Nr. 10, no. 11 (2010-06-04), S.5065-5073 |
| Datensatznummer |
250008514
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| Publikation (Nr.) |
 copernicus.org/acp-10-5065-2010.pdf |
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| Zusammenfassung |
| Black carbon (BC) particles accumulated in the Arctic troposphere and
deposited on snow have been calculated to have significant effects on
radiative forcing of the Arctic regional climate. Applying cluster analysis
technique on 10-day backward trajectories, seven distinct transport pathways
(or clusters) affecting Alert (82.5° N, 62.5° W), Nunavut in Canada
are identified in this work. Transport frequency associated with each
pathway is obtained as the fraction of trajectories in that cluster. Based
on atmospheric transport frequency and BC surface flux from surrounding
regions (i.e. North America, Europe, and former USSR), a linear regression
model is constructed to investigate the inter-annual variations of BC
observed at Alert in January and April, representative of winter and spring
respectively, between 1990 and 2005. Strong correlations are found between
BC concentrations predicted with the regression model and measurements at
Alert for both seasons (R2 equals 0.77 and 0.81 for winter and spring,
respectively). Results imply that atmospheric transport and BC emission are
the major contributors to the inter-annual variations in BC concentrations
observed at Alert in the cold seasons for the 16-year period. Other factors,
such as deposition, could also contribute to the variability in BC
concentrations but were not considered in this analysis. Based on the
regression model the relative contributions of regional BC emissions
affecting Alert are attributed to the Eurasian sector, composed of the
European Union and the former USSR, and the North American sector.
Considering both seasons, the model suggests that former USSR is the major
contributor to the near-surface BC levels at the Canadian high Arctic site
with an average contribution of about 67% during the 16-year period,
followed by European Union (18%) and North America (15%). In winter,
the atmospheric transport of BC aerosols from Eurasia is found to be even
more predominant with a multi-year average of 94%. The model estimates
smaller contribution from the Eurasian sector in spring (70%) than that
in winter. It is also found that the inter-annual variation in Eurasian
contributions depends mainly on the reduction of emissions, while the
changes in both emission and atmospheric transport contributed to the
inter-annual variation of North American contributions. |
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