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| Titel |
Anthropogenic carbon dynamics in the changing ocean |
| VerfasserIn |
J. F. Tjiputra, K. Assmann, C. Heinze |
| 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 ; 6, no. 3 ; Nr. 6, no. 3 (2010-07-01), S.605-614 |
| Datensatznummer |
250003575
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| Publikation (Nr.) |
 copernicus.org/os-6-605-2010.pdf |
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| Zusammenfassung |
| The long-term response of CO2 fluxes to climate change at the ocean
surface and within the ocean interior is investigated using a coupled
climate-carbon cycle model. This study also presents the first attempt to
quantify the evolution of lateral transport of anthropogenic carbon under
future climate change. Additionally, its impact on regional carbon storage
and uptake is also evaluated. For the 1850–2099 period, our climate change
simulation predicts oceanic uptake of anthropogenic carbon of about
538±23 Pg C. Another simulation indicates that changes in physical
climate and its associated biogeochemical feedbacks result in a release of
natural carbon of about 22±30 Pg C. The natural carbon outgassing is
attributed to the reduction in solubility and change in wind pattern in the
Southern Hemisphere. After the anthropogenic carbon passes through the
air-sea interface, it is predominantly transported along the large scale
overturning circulation below the surface layer. The spatial variations in
the transport patterns in turn influence the evolution of future regional
carbon uptake. In the North Atlantic, a slow down in the Atlantic Meridional
Overturning Circulation weakens the penetration strength of anthropogenic
carbon into the deeper ocean, which leads to a reduced uptake rate in this
region. In contrast, more than half of the anthropogenic carbon taken up in
the high latitude Southern Ocean region (south of 58° S) is
efficiently and continuously exported northward, predominantly into
intermediate waters. This transport mechanism allows continuous
increase in future carbon uptake in the high latitude Southern Ocean,
where the annual uptake strength could reach
39.3±0.9 g C m−2 yr−1, more than twice the global mean of
16.0±0.3 g C m−2 yr−1 by the end of the 21st century. Our
study further underlines the key role of the Southern Ocean in controlling
long-term future carbon uptake. |
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