45 th Liège Colloquium May 13 – 17, 2013 Fabian Große 1 *, Johannes Pätsch 2 and Jan O. Backhaus 2 1 Research Group Scientific Computing, Department of Informatics, University of Hamburg 2 Institute of Oceanography, University of Hamburg * Corresponding author: [email protected]Parameterising Primary Production and Convection in a 3D Model
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45 th Liège Colloquium May 13 – 17, 2013 Fabian Große 1 *, Johannes Pätsch 2 and Jan O. Backhaus 2 1 Research Group Scientific Computing, Department of.
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45th Liège ColloquiumMay 13 – 17, 2013
Fabian Große1*, Johannes Pätsch2 and Jan O. Backhaus2
1 Research Group Scientific Computing, Department of Informatics, University of Hamburg2 Institute of Oceanography, University of Hamburg
• parameterisation of phytoconvection:• observed upper layer chlorophyll-a concentrations reproduced• strong influence of convection on primary production and
carbon export production
• sliding function allows continuous transition from winter to summer regime
• problems during decline of mixed layer in spring
• applied MLD criterion (Tsurf – T > 0.4K) not suitable to:
• detect haline stratification
• distinguish between convective and frictionional mixing
Outlook
• improvement of sliding function:
→ include turbulent mixing depth (Taylor & Ferrari, 2011)
• replace MLD criterion (Tsurf – T > 0.4K)
• apply parameterisation on model area with more regions of deep winter convection for better data basis
• include results from tank experiments investigating phytoplankton adaptation to different dark-light cycles
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Vielen Dank für Ihre Aufmerksamkeit.
Parametrisierung von Primärproduktion und winterlicher Konvektion in einem 3D Modell
References• D’Asaro, Eric A.. Convection and the seeding of the North Atlantic bloom.
Journal of Marine Systems, 69:233–237, 2008.
• Backhaus, J., Wehde, H., Hegseth, E., and Kämpf, J. ‘Phyto-convection’: the role of oceanic convection in primary production. Marine Ecology. Progress Series, 189:77–92, 1999.
• Backhaus, J., Hegseth, E., Wehde, H., Irigoien, X., Hatten, K., and Logemann, K. Convection and primary production in winter. Marine Ecology Progress Series, 251:1–14, 2003.
• Janout, M. Biological parameterization of convection in a mixed layer model. Pages 1–87, 2003.
• Lorkowski, I., Pätsch, J., Moll, A., and Kühn, W. Interannual variability of carbon fluxes in the North Sea from 1970 to 2006 - Competing effects of abiotic and biotic drivers on the gas-exchange of CO2. Estuarine, Coastal and Shelf Science, 2012.
• Taylor, J. and Ferrari, R. Shutdown of turbulent convection as a new criterion for the onset of spring phytoplankton blooms. Limnology and