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| Titel |
The North Atlantic Oscillation controls air pollution transport to the Arctic |
| VerfasserIn |
S. Eckhardt, A. Stohl, S. Beirle, N. Spichtinger, P. James, C. Forster, C. Junker, T. Wagner, U. Platt, S. G. Jennings |
| 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 ; 3, no. 5 ; Nr. 3, no. 5 (2003-10-24), S.1769-1778 |
| Datensatznummer |
250001276
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| Publikation (Nr.) |
 copernicus.org/acp-3-1769-2003.pdf |
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| Zusammenfassung |
| This paper studies the interannual variability of pollution pathways from
northern hemisphere (NH) continents into the Arctic. Using a 15-year model
simulation of the dispersion of passive tracers representative of anthropogenic emissions from NH continents, we show that the North Atlantic
Oscillation (NAO) exerts a strong control on the pollution transport into the
Arctic, particularly in winter and spring. For tracer lifetimes of 5 (30) days, surface concentrations in the Arctic winter are enhanced by about
70% (30%) during high phases of the NAO (in the following referred to as
NAO+) compared to its low phases (NAO-). This is mainly due to great
differences in the pathways of European pollution during NAO+ and
NAO- phases, respectively, but reinforced by North American pollution, which is
also enhanced in the Arctic during NAO+ phases. In contrast, Asian
pollution in the Arctic does not significantly depend on the NAO phase. The
model results are confirmed using remotely-sensed NO2 vertical atmospheric
columns obtained from seven years of satellite measurements, which show enhanced northward
NO2 transport and reduced NO2 outflow into the North
Atlantic from Central Europe during NAO+ phases. Surface measurements of
carbon monoxide (CO) and black carbon at high-latitude stations further corroborate the overall picture of enhanced Arctic pollution levels during
NAO+ phases |
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