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| Titel |
The global marine phosphorus cycle: sensitivity to oceanic circulation |
| VerfasserIn |
C. P. Slomp, P. Cappellen |
| 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 ; 4, no. 2 ; Nr. 4, no. 2 (2007-02-22), S.155-171 |
| Datensatznummer |
250001615
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| Publikation (Nr.) |
 copernicus.org/bg-4-155-2007.pdf |
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| Zusammenfassung |
| A new mass balance model for the coupled marine cycles of phosphorus (P) and
carbon (C) is used to examine the relationships between oceanic circulation,
primary productivity, and sedimentary burial of reactive P and particulate
organic C (POC), on geological time scales. The model explicitly represents
the exchanges of water and particulate matter between the continental
shelves and the open ocean, and it accounts for the redox-dependent burial
of POC and the various forms of reactive P (iron(III)-bound P, particulate
organic P (POP), authigenic calcium phosphate, and fish debris). Steady
state and transient simulations indicate that a slowing down of global ocean
circulation decreases primary production in the open ocean, but increases
that in the coastal ocean. The latter is due to increased transfer of
soluble P from deep ocean water to the shelves, where it fuels primary
production and causes increased reactive P burial. While authigenic calcium
phosphate accounts for most reactive P burial ocean-wide, enhanced
preservation of fish debris may become an important reactive P sink in
deep-sea sediments during periods of ocean anoxia. Slower ocean circulation
globally increases POC burial, because of enhanced POC preservation under
anoxia in deep-sea depositional environments and higher primary productivity
along the continental margins. In accordance with geological evidence, the
model predicts increased accumulation of reactive P on the continental
shelves during and following periods of ocean anoxia. |
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