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| Titel |
Sources of anions in aerosols in northeast Greenland during late winter |
| VerfasserIn |
M. Fenger, L. L. Sørensen, K. Kristensen, B. Jensen, Q. T. Nguyen, J. K. Nøjgaard, A. Maßling, H. Skov, T. Becker, M. Glasius |
| 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 ; 13, no. 3 ; Nr. 13, no. 3 (2013-02-07), S.1569-1578 |
| Datensatznummer |
250017647
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| Publikation (Nr.) |
 copernicus.org/acp-13-1569-2013.pdf |
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| Zusammenfassung |
The knowledge of climate effects of atmospheric aerosols is associated with
large uncertainty, and a better understanding of their physical and chemical
properties is needed, especially in the Arctic environment. The objective of
the present study is to improve our understanding of the processes affecting
the composition of aerosols in the high Arctic. Therefore size-segregated
aerosols were sampled at a high Arctic site, Station Nord (Northeast
Greenland), in March 2009 using a Micro Orifice Uniform Deposit Impactor. The
aerosol samples were extracted in order to analyse three water-soluble
anions: chloride, nitrate and sulphate. The results are discussed based on
possible chemical and physical transformations as well as transport
patterns.
The total concentrations of the ions at Station Nord were
53–507 ng m−3, 2–298 ng m−3 and 535–1087 ng m−3 for
chloride (Cl−), nitrate (NO3−) and sulphate (SO42−),
respectively. The aerosols in late winter/early spring, after polar sunrise,
are found to be a mixture of long-range transported and regional to local
originating aerosols. Fine particles, smaller than 1 μm, containing
SO42−, Cl− and NO3−, are hypothesized to originate from
long-range transport, where SO42− is by far the dominating anion
accounting for 50–85% of the analyzed mass. The analysis suggests that
Cl− and NO3− in coarser particles (> 1.5 μm) originate
from local/regional sources. Under conditions where the air mass is
transported over sea ice at high wind speeds, very coarse particles (>
18 μm) are observed, and it is hypothesized that frost flowers on
the sea ice are a source of the very coarse nitrate particles. |
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