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Model development and diagnostics

Coastal oceans are complex ecosystems. Their description requires an interdisciplinary approach. In addition to detailed measurements, realistic model simulations are necessary to understand the sophisticated interplay of all relevant processes. For this we develop advanced model techniques and diagnostics.

In the framework of the interdisciplinary research at IOW we develop and apply the coastal ocean model GETM as the backbone of a modular model system for high-resolution ecosystem simulations. We implement latest ESMF/NUOPC technologies to couple models for the ocean, atmosphere and waves.

One of the most challenging problems in ocean models is the numerical mixing of water masses. The systematic reduction of this spurious mixing demands for new numerical techniques and for reliable diagnostic methods to locate the hotspots of numerical mixing and to assess the developed techniques. In the recent years we established an analysis method to quantify numerical and physical mixing at model runtime. With this diagnostic method we could demonstrate the impact of different vertical coordinates and advection schemes on numerical mixing. The recently developed adaptive coordinates significantly reduce numerical mixing and ensure optimal vertical resolution even in dynamically different systems.

Publications and People

  • Fofonova, V., T. Kärnä, K. Klingbeil, A. Androsov, I. Kuznetsov, D. Sidorenko, S. Danilov, H. Burchard, K. H. Wiltshire (2021) Plume spreading test case for coastal ocean models. Geoscientific Model Development Discuss.. 10.5194/gmd-2020-438.
  • Li, Q., J. Bruggeman, H. Burchard, K. Klingbeil, L. Umlauf, K. Bolding (2021) Integrating CVMix into GOTM (v6.0): A consistent framework for testing, comparing, and applying ocean mixing schemes. Geoscientific Model Development. 10.5194/gmd-14-4261-2021.
  • Bauer, T. P., K. Klingbeil, P. L. Holtermann, B. Heinold, H. Radtke, O. Knoth (2020) ICONGETM v1.0 -- Flexible two-way coupling via exchange grids between the unstructured-grid atmospheric model ICON and the structured-grid coastal ocean model GETM. Geoscientific Model Development Discuss.. 10.5194/gmd-2020-269.
  • Klingbeil, K., J. Becherer, E. Schulz, H. E. de Swart, H. M. Schuttelaars, A. Valle-Levinson, H. Burchard (2019) Thickness-Weighted Averaging in tidal estuaries and the vertical distribution of the Eulerian residual transport. Journal of Physical Oceanography. 10.1175/JPO-D-18-0083.1.
  • Lemmen, C., R. Hofmeister, K. Klingbeil, M. H. Nasermoaddeli, O. Kerimoglu, H. Burchard, F. Kösters, K. W. Wirtz (2018) Modular System for Shelves and Coasts (MOSSCO v1.0) – a flexible and multi-component framework for coupled coastal ocean ecosystem modelling. Geoscientific Model Development. 10.5194/gmd-11-915-2018.

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