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| Titel |
Carbon dynamics in the western Arctic Ocean: insights from full-depth carbon isotope profiles of DIC, DOC, and POC |
| VerfasserIn |
D. R. Griffith, A. P. McNichol, L. Xu, F. A. McLaughlin, R. W. Macdonald, K. A. Brown, T. I. Eglinton |
| 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. 3 ; Nr. 9, no. 3 (2012-03-28), S.1217-1224 |
| Datensatznummer |
250006856
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| Publikation (Nr.) |
 copernicus.org/bg-9-1217-2012.pdf |
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| Zusammenfassung |
| Arctic warming is projected to continue throughout the coming century. Yet,
our currently limited understanding of the Arctic Ocean carbon cycle hinders
our ability to predict how changing conditions will affect local Arctic
ecosystems, regional carbon budgets, and global climate. We present here the
first set of concurrent, full-depth, dual-isotope profiles for dissolved
inorganic carbon (DIC), dissolved organic carbon (DOC), and suspended
particulate organic carbon (POCsusp) at two sites in the Canada Basin of the
Arctic Ocean. The carbon isotope composition of sinking and suspended POC in
the Arctic contrasts strongly with open ocean Atlantic and Pacific sites,
pointing to a combination of inputs to Arctic POCsusp at depth, including
surface-derived organic carbon (OC), sorbed/advected OC, and OC derived from
in situ DIC fixation. The latter process appears to be particularly
important at intermediate depths, where mass balance calculations suggest that OC
derived from in situ DIC fixation contributes up to 22% of POCsusp. As
in other oceans, surface-derived OC is still a dominant source to Arctic
POCsusp. Yet, we suggest that significantly smaller vertical POC fluxes in
the Canada Basin make it possible to see evidence of DIC fixation in the
POCsusp pool even at the bulk isotope level. |
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