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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 8
Geosci. Model Dev., 10, 3105–3123, 2017
https://doi.org/10.5194/gmd-10-3105-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Nucleus for European Modelling of the Ocean - NEMO

Geosci. Model Dev., 10, 3105–3123, 2017
https://doi.org/10.5194/gmd-10-3105-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Development and technical paper 22 Aug 2017

Development and technical paper | 22 Aug 2017

Sea-ice evaluation of NEMO-Nordic 1.0: a NEMO–LIM3.6-based ocean–sea-ice model setup for the North Sea and Baltic Sea

Per Pemberton1, Ulrike Löptien3, Robinson Hordoir2, Anders Höglund2, Semjon Schimanke2, Lars Axell2, and Jari Haapala4 Per Pemberton et al.
  • 1Swedish Meteorological and Hydrological Institute, 426 71 Gothenburg, Sweden
  • 2Swedish Meteorological and Hydrological Institute, 601 76 Norrköping, Sweden
  • 3GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany
  • 4Finnish Meteorological Institute, 00101 Helsinki, Finland

Abstract. The Baltic Sea is a seasonally ice-covered marginal sea in northern Europe with intense wintertime ship traffic and a sensitive ecosystem. Understanding and modeling the evolution of the sea-ice pack is important for climate effect studies and forecasting purposes. Here we present and evaluate the sea-ice component of a new NEMO–LIM3.6-based ocean–sea-ice setup for the North Sea and Baltic Sea region (NEMO-Nordic). The setup includes a new depth-based fast-ice parametrization for the Baltic Sea. The evaluation focuses on long-term statistics, from a 45-year long hindcast, although short-term daily performance is also briefly evaluated. We show that NEMO-Nordic is well suited for simulating the mean sea-ice extent, concentration, and thickness as compared to the best available observational data set. The variability of the annual maximum Baltic Sea ice extent is well in line with the observations, but the 1961–2006 trend is underestimated. Capturing the correct ice thickness distribution is more challenging. Based on the simulated ice thickness distribution we estimate the undeformed and deformed ice thickness and concentration in the Baltic Sea, which compares reasonably well with observations.

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The Baltic Sea is seasonally ice covered with intense wintertime ship traffic and a sensitive ecosystem. Understanding the sea-ice pack is important for climate effect studies and forecasting. A NEMO-LIM3.6-based model setup for the North Sea/Baltic Sea is introduced, including a method for ice in the coastal zone. We evaluate different sea-ice parameters and overall find that the model agrees well with the observation though deformed ice is more challenging to capture.
The Baltic Sea is seasonally ice covered with intense wintertime ship traffic and a sensitive...
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