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| Titel |
The Arctic Ocean marine carbon cycle: evaluation of air-sea CO2 exchanges, ocean acidification impacts and potential feedbacks |
| VerfasserIn |
N. R. Bates, J. T. Mathis |
| 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 ; 6, no. 11 ; Nr. 6, no. 11 (2009-11-05), S.2433-2459 |
| Datensatznummer |
250004084
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| Publikation (Nr.) |
 copernicus.org/bg-6-2433-2009.pdf |
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| Zusammenfassung |
| At present, although seasonal sea-ice cover mitigates atmosphere-ocean gas
exchange, the Arctic Ocean takes up carbon dioxide (CO2) on the order
of −66 to −199 Tg C year−1 (1012 g C),
contributing 5–14% to the global balance
of CO2 sinks and sources. Because of this, the Arctic Ocean has an
important influence on the global carbon cycle, with the marine carbon cycle
and atmosphere-ocean CO2 exchanges sensitive to Arctic Ocean and global
climate change feedbacks. In the near-term, further sea-ice loss and
increases in phytoplankton growth rates are expected to increase the uptake
of CO2 by Arctic Ocean surface waters, although mitigated somewhat by surface
warming in the Arctic. Thus, the capacity of the Arctic Ocean to uptake
CO2 is expected to alter in response to environmental changes driven
largely by climate. These changes are likely to continue to modify the
physics, biogeochemistry, and ecology of the Arctic Ocean in ways that are
not yet fully understood. In surface waters, sea-ice melt, river runoff,
cooling and uptake of CO2 through air-sea gas exchange combine to
decrease the calcium carbonate (CaCO3) mineral saturation states
(Ω) of seawater while seasonal phytoplankton primary production (PP)
mitigates this effect. Biological amplification of ocean acidification effects
in subsurface waters, due to the remineralization of organic matter, is likely
to reduce the ability of many species to produce CaCO3 shells or tests with
profound implications for Arctic marine ecosystems |
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