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| Titel |
Dynamical and biogeochemical control on the decadal variability of ocean carbon fluxes |
| VerfasserIn |
R. Séférian, L. Bopp, D. Swingedouw, J. Servonnat |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2190-4979
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| Digitales Dokument |
URL |
| Erschienen |
In: Earth System Dynamics ; 4, no. 1 ; Nr. 4, no. 1 (2013-04-09), S.109-127 |
| Datensatznummer |
250017774
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| Publikation (Nr.) |
 copernicus.org/esd-4-109-2013.pdf |
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| Zusammenfassung |
| Several recent observation-based studies suggest that ocean anthropogenic
carbon uptake has slowed down due to the impact of anthropogenic forced
climate change. However, it remains unclear whether detected changes over the
recent time period can be attributed to anthropogenic climate change or
rather to natural climate variability (internal plus naturally forced
variability) alone. One large uncertainty arises from the lack of knowledge
on ocean carbon flux natural variability at the decadal time scales. To gain
more insights into decadal time scales, we have examined the internal
variability of ocean carbon fluxes in a 1000 yr long preindustrial
simulation performed with the Earth System Model IPSL-CM5A-LR. Our analysis
shows that ocean carbon fluxes exhibit low-frequency oscillations that emerge
from their year-to-year variability in the North Atlantic, the North Pacific,
and the Southern Ocean. In our model, a 20 yr mode of variability in the
North Atlantic air-sea carbon flux is driven by sea surface temperature
variability and accounts for ~40% of the interannual regional
variance. The North Pacific and the Southern Ocean carbon fluxes are also
characterised by decadal to multi-decadal modes of variability (10 to 50 yr)
that account for 20–40% of the interannual regional variance. These modes
are driven by the vertical supply of dissolved inorganic carbon through the
variability of Ekman-induced upwelling and deep-mixing events. Differences in
drivers of regional modes of variability stem from the coupling between ocean
dynamics variability and the ocean carbon distribution, which is set by
large-scale secular ocean circulation. |
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