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| Titel |
Contribution of riverine nutrients to the silicon biogeochemistry of the global ocean – a model study |
| VerfasserIn |
C. Y. Bernard, H. H. Dürr, C. Heinze, J. Segschneider, E. Maier-Reimer |
| 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 ; 8, no. 3 ; Nr. 8, no. 3 (2011-03-04), S.551-564 |
| Datensatznummer |
250005562
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| Publikation (Nr.) |
 copernicus.org/bg-8-551-2011.pdf |
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| Zusammenfassung |
Continental shelf seas are known to support a large fraction of the global
primary production. Yet, they are mostly ignored or neglected in global
biogeochemical models. A number of processes that control the transfer of
dissolved nutrients from rivers to the open ocean remain poorly understood.
This applies in particular to dissolved silica which drives the growth of
diatoms that form a large part of the phytoplankton biomass and are thus an
important contributor to export production of carbon.
Here, the representation of the biogeochemical cycling along continents is
improved by coupling a high resolution database of riverine fluxes of
nutrients to the global biogeochemical ocean general circulation model
HAMOCC5-OM. Focusing on silicon (Si), but including the whole suite of
nutrients – carbon (C), nitrogen (N) and phosphorus (P) in various forms –
inputs are implemented in the model at coastal coupling points using the
COSCAT global database of 156 mega-river-ensemble catchments from Meybeck et
al. (2006). The catchments connect to the ocean through coastal
segments according to three sets of criteria: natural limits, continental
shelf topography, and geophysical dynamics.
According to the model the largest effects on nutrient concentrations occur
in hot spots such as the Amazon plume, the Arctic – with high nutrient
inputs in relation to its total volume, and areas that encounter the largest
increase in human activity, e.g., Southern Asia. |
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