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| Titel |
Sources of light-absorbing aerosol in arctic snow and their seasonal variation |
| VerfasserIn |
Dean A. Hegg, Stephen G. Warren, Thomas C. Grenfell, Sarah J. Doherty, Antony D. Clarke |
| 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. 22 ; Nr. 10, no. 22 (2010-11-22), S.10923-10938 |
| Datensatznummer |
250008903
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| Publikation (Nr.) |
 copernicus.org/acp-10-10923-2010.pdf |
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| Zusammenfassung |
| Two data sets consisting of measurements of light absorbing aerosols (LAA)
in arctic snow together with suites of other corresponding chemical
constituents are presented; the first from Siberia, Greenland and near the
North Pole obtained in 2008, and the second from the Canadian arctic
obtained in 2009. A preliminary differentiation of the LAA into black carbon
(BC) and non-BC LAA is done. Source attribution of the light absorbing
aerosols was done using a positive matrix factorization (PMF) model. Four
sources were found for each data set (crop and grass burning, boreal biomass
burning, pollution and marine). For both data sets, the crops and grass
biomass burning was the main source of both LAA species, suggesting the
non-BC LAA was brown carbon. Depth profiles at most of the sites allowed
assessment of the seasonal variation in the source strengths. The biomass
burning sources dominated in the spring but pollution played a more
significant (though rarely dominant) role in the fall, winter and, for
Greenland, summer. The PMF analysis is consistent with trajectory analysis
and satellite fire maps. |
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