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Document Version Version Comment Date Status
378159.0 [No comment] 21.03.2011 12:10 Released

ID: 378159.0, MPI für Meteorologie / Ocean in the Earth System
Contribution of riverine nutrients to the silicon biogeochemistry of the global ocean
Authors:Bernard, C.; Dürr, H.; Heinze, C.; Segschneider, J.; Maier-Reimer, E.
Date of Publication (YYYY-MM-DD):2011
Title of Journal:Biogeosciences
Journal Abbrev.:Biogeosci.
Start Page:551
End Page:564
Review Status:Peer-review
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Carola Kauhs
Affiliations:MPI für Meteorologie/Ocean in the Earth System