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| Titel |
Heterogeneity of impacts of high CO2 on the North Western European Shelf |
| VerfasserIn |
Y. Artioli, J. C. Blackford, G. Nondal, R. G. J. Bellerby, S. L. Wakelin, J. T. Holt, M. Butenschön, J. I. Allen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 3 ; Nr. 11, no. 3 (2014-02-03), S.601-612 |
| Datensatznummer |
250117185
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| Publikation (Nr.) |
 copernicus.org/bg-11-601-2014.pdf |
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| Zusammenfassung |
| The increase in atmospheric CO2 is a dual threat to the marine
environment: from one side it drives climate change, leading to modifications
in water temperature, circulation patterns and stratification intensity; on
the other side it causes a decrease in marine pH (ocean acidification, or OA)
due to the increase in dissolved CO2. Assessing the combined impact of
climate change and OA on marine ecosystems is a challenging task. The
response of the ecosystem to a single driver can be highly variable and
remains still uncertain; additionally the interaction between these can be
either synergistic or antagonistic. In this work we use the coupled
oceanographic–ecosystem model POLCOMS-ERSEM driven by climate forcing to
study the interaction between climate change and OA. We focus in particular
on carbonate chemistry, primary and secondary production. The model has been
run in three different configurations in order to assess separately the
impacts of climate change on net primary production and of OA on the
carbonate chemistry, which have been strongly supported by scientific
literature, from the impact of biological feedbacks of OA on the ecosystem,
whose uncertainty still has to be well constrained. The global mean of the
projected decrease of pH at the end of the century is about 0.27 pH units,
but the model shows significant interaction among the drivers and high
variability in the temporal and spatial response. As a result of this high
variability, critical tipping point can be locally and/or temporally reached:
e.g. undersaturation with respect to aragonite is projected to occur in the
deeper part of the central North Sea during summer. Impacts of climate change
and of OA on primary and secondary production may have similar magnitude,
compensating in some area and exacerbating in others. |
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