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| Titel |
Detecting anthropogenic carbon dioxide uptake and ocean acidification in the North Atlantic Ocean |
| VerfasserIn |
N. R. Bates, M. H. P. Best, K. Neely, R. Garley, A. G. Dickson, R. J. Johnson |
| 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 ; 9, no. 7 ; Nr. 9, no. 7 (2012-07-11), S.2509-2522 |
| Datensatznummer |
250007183
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| Publikation (Nr.) |
 copernicus.org/bg-9-2509-2012.pdf |
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| Zusammenfassung |
| Fossil fuel use, cement manufacture and land-use changes are the primary
sources of anthropogenic carbon dioxide (CO2) to the atmosphere, with
the ocean absorbing approximately 30% (Sabine et al., 2004). Ocean uptake
and chemical equilibration of anthropogenic CO2 with seawater results
in a gradual reduction in seawater pH and saturation states (Ω) for
calcium carbonate (CaCO3) minerals in a process termed ocean
acidification. Assessing the present and future impact of ocean
acidification on marine ecosystems requires detection of the multi-decadal
rate of change across ocean basins and at ocean time-series sites. Here, we
show the longest continuous record of ocean CO2 changes and ocean
acidification in the North Atlantic subtropical gyre near Bermuda from
1983–2011. Dissolved inorganic carbon (DIC) and partial pressure of CO2
(pCO2) increased in surface seawater by ~40 μmol kg−1
and ~50 μatm (~20%), respectively. Increasing Revelle
factor (β) values imply that the capacity of North Atlantic surface
waters to absorb CO2 has also diminished. As indicators of ocean
acidification, seawater pH decreased by ~0.05 (0.0017 yr−1) and
ω values by ~7–8%. Such data provide critically needed
multi-decadal information for assessing the North Atlantic Ocean CO2
sink and the pH changes that determine marine ecosystem responses to ocean
acidification. |
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