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| Titel |
How to best simulate production and dissolution of calcium carbonate in an shelf sea ecosystem model? |
| VerfasserIn |
Wilfried Kühn, Johannes Pätsch |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250042457
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| Zusammenfassung |
| Recently, the joint project, ‘Biological Impacts of Ocean Acidification’, briefly BIOACID,
started in Germany. Part of this large and challenging project is our ecosystem modeling
group’s subproject ‘Impact of alkalinity fluxes from the Wadden Sea on the carbon cycle and
the primary production of the North Sea’. To investigate this problem, it is necessary to
reliably calculate the total alkalinity as function of physical, chemical and biological
processes in the water column and at the sediment – what we circumvented in previous 3D
studies by prescribing climatological fields of alkalinity. As part of the project, a more
realistic representation of the biogenic production of calcium carbonate, mostly
calcite, and its dissolution within the water column and at the sediment has to be
implemented.
We will give a brief overview of the different model approaches recently used to describe
these processes (Aumont and Bopp, 2006; Gehlen et al., 2007). A critical assessment of
applying these parameterizations, primarily developed for global applications, within the
shelf sea ecosystem model ECOHAM4 will be given. The critical point is the description of
carbonate dissolution in a shallow sea. Preliminary simulations with a 1-D version
of ECOHAM4 demonstrate the effect of different parameterizations of pelagic
and dissolution on the near-surface pCO2 and, consequently, on the air-sea flux of
CO2.
Aumont, O. and L. Bopp, 2006, Globalizing results from ocean in situ iron fertilization
studies, Global Biogeochem. Cycles, 20, GB2017, doi:10.1029/2005GB002591
Gehlen, M., Gangstø, R., Schneider, B., Bopp, L., Aumont, O., Ethe, C., 2007,
Biogeosciences 4, 505-519 |
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