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| Titel |
The effects of global climate change on the cycling and processes of persistent organic pollutants (POPs) in the North Sea |
| VerfasserIn |
K. O'Driscoll, B. Mayer, J. Su, M. Mathis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 10, no. 3 ; Nr. 10, no. 3 (2014-05-27), S.397-409 |
| Datensatznummer |
250116998
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| Publikation (Nr.) |
 copernicus.org/os-10-397-2014.pdf |
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| Zusammenfassung |
The fate and cycling of two selected legacy persistent organic pollutants
(POPs), PCB 153 and γ-HCH, in the North Sea in the 21st century have
been modelled with combined hydrodynamic and fate and transport ocean models
(HAMSOM and FANTOM, respectively). To investigate the impact of climate
variability on POPs in the North Sea in the 21st century, future scenario
model runs for three 10-year periods to the year 2100 using plausible levels
of both in situ concentrations and atmospheric, river and open boundary
inputs are performed. This slice mode under a moderate scenario (A1B) is
sufficient to provide a basis for further analysis. For the HAMSOM and
atmospheric forcing, results of the IPCC A1B (SRES) 21st century scenario are
utilized, where surface forcing is provided by the REMO downscaling of the
ECHAM5 global atmospheric model, and open boundary conditions are provided by
the MPIOM global ocean model.
Dry gas deposition and volatilization of γ-HCH increase in the future
relative to the present by up to 20% (in the spring and summer months for
deposition and in summer for volatilization). In the water column, total mass
of γ-HCH and PCB 153 remain fairly steady in all three runs. In
sediment, γ-HCH increases in the future runs, relative to the present,
while PCB 153 in sediment decreases exponentially in all three runs, but even
faster in the future, due to the increased number of storms, increased
duration of gale wind conditions and increased water and air temperatures,
all of which are the result of climate change. Annual net sinks exceed
sources at the ends of all periods.
Overall, the model results indicate that the climate change scenarios
considered here generally have a negligible influence on the simulated fate
and transport of the two POPs in the North Sea, although the increased number
and magnitude of storms in the 21st century will result in POP resuspension
and ensuing revolatilization events. Trends in emissions from primary and
secondary sources will remain the key driver of levels of these contaminants
over time. |
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