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An isopycnic oceancarbon cycle model Karen M. AssmannMats BentsenJoachim Segschneider2010 год

An isopycnic ocean carbon cycle model
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Аннотация: Abstract. The carbon cycle is a major forcing component in the global climate system. Modelling studies, aiming to explain recent and past climatic changes and to project future ones, increasingly include the interaction between the physical and biogeochemical systems. Their ocean components are generally z-coordinate models that are conceptually easy to use but that employ a vertical coordinate that is alien to the real ocean structure. Here, we present first results from a newly-developed isopycnic carbon cycle model and demonstrate the viability of using an isopycnic physical component for this purpose. As expected, the model represents well the interior ocean transport of biogeochemical tracers and produces realistic tracer distributions. Difficulties in employing a purely isopycnic coordinate lie mainly in the treatment of the surface boundary layer which is often represented by a bulk mixed layer. The most significant adjustments of the ocean biogeochemistry model HAMOCC, for use with an isopycnic coordinate, were in the representation of upper ocean biological production. We present a series of sensitivity studies exploring the effect of changes in biogeochemical and physical processes on export production and nutrient distribution. Apart from giving us pointers for further model development, they highlight the importance of preformed nutrient distributions in the Southern Ocean for global nutrient distributions. The sensitivity studies show that iron limitation for biological particle production, the treatment of light penetration for biological production, and the role of diapycnal mixing result in significant changes of nutrient distributions and liniting factors of biological production.
Год издания: 2010
Авторы: Karen M. Assmann, Mats Bentsen, Joachim Segschneider, Christoph Heinze
Издательство: Copernicus Publications
Источник: Geoscientific model development
Ключевые слова: Marine and coastal ecosystems, Oceanographic and Atmospheric Processes, Climate variability and models
Другие ссылки: Geoscientific model development (PDF)
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DOAJ (DOAJ: Directory of Open Access Journals) (HTML)
MPG.PuRe (Max Planck Society) (PDF)
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