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| Titel |
Source regions of some persistent organic pollutants measured in the atmosphere at Birkenes, Norway |
| VerfasserIn |
S. Eckhardt, K. Breivik, Y. F. Li, S. Manø, A. Stohl |
| 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 ; 9, no. 17 ; Nr. 9, no. 17 (2009-09-11), S.6597-6610 |
| Datensatznummer |
250007621
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| Publikation (Nr.) |
 copernicus.org/acp-9-6597-2009.pdf |
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| Zusammenfassung |
| A key feature of POPs (Persistent Organic Pollutants) is their potential for
long-range atmospheric transport. In order to better understand and predict
atmospheric source-receptor relationships of POPs, we have modified an
existing Lagrangian transport model (FLEXPART) to include some of the key
processes that control the atmospheric fate of POPs. We also present four
years (2004–2007) of new atmospheric measurement data for polychlorinated
biphenyls (PCBs) and hexachlorocyclohexanes (HCHs) obtained at Birkenes, an
EMEP (European Monitoring and Evaluation Programme) site in southern Norway.
The model overestimates measured PCB-28 and γ-HCH concentrations by
factors of 2 and 8, respectively, which is most likely because the emissions
used as input to the model are overestimated. FLEXPART captures the temporal
variability in the measurements very well and, depending on season, explains
31–67% (14–62%) of the variance of measured PCB-28 (γ-HCH)
concentrations. FLEXPART, run in a time-reversed (adjoint) mode, was used to
identify the source regions responsible for the POP loading at the Birkenes
station. Emissions in Central Europe and Eastern Europe contributed 32%
and 24%, respectively, to PCB-28 at Birkenes, while Western Europe was
found to be the dominant source (50%) for γ-HCH. Intercontinental
transport from North America contributed 13% γ-HCH. While
FLEXPART has no treatment of the partitioning of POPs between different
surface media, it was found a very useful tool for studying atmospheric
source-receptor relationships for POPs and POP-like chemicals that do not
sorb strongly to atmospheric particles and whose atmospheric levels are
believed to be mainly controlled by primary sources. |
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