Seminars of the Focus Area Complex Systems

Prof. Dr. C. Beta, Prof. Dr. K. Dethloff, Prof. Dr. R. Engbert, Prof. Dr. M. Holschneider, Prof. Dr. W. Huisinga, Prof. Dr. Ralf Metzler, Prof. Dr. A. Pikovsky, Prof. Dr. S. Reich, Prof. Dr. M. Rosenblum, Prof. Dr. G. Rüdiger, Prof. Dr. T. Scheffer, Prof. Dr. F. Scherbaum, Prof. Dr. J. Selbig, Prof. Dr. F. Spahn

Seminar

Speaker: Matthias Hofmann, Institute for Climat Impact Research, Potsdam

Title: Interaction between physics and biogeochemistry in ocean general circulation models (Habilitationsvorstellung)

Time: Wed, Oct 17, 2012, 4:15pm

Place: bldg 28, room 0.108

Abstract:
Ocean general circulation models (OGCMs) have been established as indispensable tools in the field of climate sciences. As a key component in Earth system models, they communicate with other sub-models of the climate system via the exchange of physical variables such as heat, fresh water and carbon dioxide. As an example, OGCMs provide crucial feedbacks to the atmosphere caused by variations in its physical state owing to natural or anthropogenic disturbances. However, OGCMs have a value of their own by providing the ability to simulate the evolution of ocean physical and marine biogeochemical processes.

In my talk I would like to demonstrate the performance of PIKs coupled ocean circulation - biogeochemistry model POTSMOM-C which mainly bases on the OGCM code developed at the Princeton University (MOM3). After a short introduction to the underlying ocean physics and marine biogeochemistry important results from our research will be presented. It will be shown that the choice of the numerical tracer advection scheme employed in OGCMs is of utter importance for the reliability of the simulations. Among other examples I will demonstrate the likely impacts of future anthropogenic global warming and ocean acidification on the oxygen concentrations in the mesopelagic ocean and the pelagic plankton biomass. Furthermore, the sensitivity of the large scale ocean circulation and the air-sea gas exchange of carbon dioxide to fluctuations in the strength of the Southern Westerly winds will be evaluated. The latter is regarded as a source of uncertainty when trying to reconstruct glacial/interglacial variations of atmospheric carbon dioxide.

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Past NLD Seminars (1994-2007) & (2008 ...)

Students' seminar: Theoretical Physics, PIK, Modeling & TSA Berlin-Potsdam-Colloquia: PhysGesellschaft Berlin, TU Berlin, Pro Physik, AIP, AEI, MPI-KGF, GFZ, HMI, PIK, AWI, Max Planck Institute for the History of Science, Mathematik, DPG Disputationen, & Vorschau UP

Udo Schwarz, Zentrum für Dynamik komplexer Systeme,
Universität Potsdam, Campus Golm Karl-Liebknecht-Str. 24, 14476 Potsdam, building 28, room 2.107
Phone: (+49-331) 977-1658, Fax : (+49-331) 977-1045

Email: Udo.Schwarz AT uni-potsdam.de

DFG SFB 1294

DFG Sonderforschungsbereich 1294 Data assimilation

DFG SPP 1488

DFG Schwerpunktprogramm 1488 Planetmag


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