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Discussion papers | Copyright
https://doi.org/10.5194/gmd-2018-2
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 05 Apr 2018

Model description paper | 05 Apr 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Nemo-Nordic 1.0: A NEMO based ocean model for Baltic & North Seas, research and operational applications

Robinson Hordoir1, Lars Axell1, Anders Höglund1, Christian Dieterich1, Filippa Fransner2, Matthias Gröger1, Ye Liu1, Per Pemberton1, Semjon Schimanke1, Helen Andersson1, Patrik Ljungemyr1, Petter Nygren1, Saeed Falahat1, Adam Nord1, Anette Jönsson1, Irène Lake1, Kristofer Döös2, Magnus Hieronymus2, Heiner Dietze3, Ulrike Löptien3, Ivan Kuznetsov4, Antti Westerlund5, Laura Tuomi5, and Jari Haapala5 Robinson Hordoir et al.
  • 1Swedish Meteorological and Hydrological Institute, Norrköping, Sweden
  • 2Department of Meteorology, Stockholm University, Sweden
  • 3GEOMAR, Helmholtz Centre for Ocean Research, Kiel, Germany
  • 4Institute of Coastal Research, Helmholtz-Zentrum, Geesthacht, Germany
  • 5Finnish Meteorological Institute, Helsinki, Finland

Abstract. We present Nemo-Nordic, a Baltic & North Sea model based on the NEMO ocean engine. Surrounded by highly industrialised countries, the Baltic and North seas, and their assets associated with shipping, fishing and tourism; are vulnerable to anthropogenic pressure and climate change. Ocean models providing reliable forecasts, and enabling climatic studies, are important tools for the shipping infrastructure and to get a better understanding of effects of climate change on the marine ecosystems. Nemo-Nordic is intended to come as a tool for both short term and long term simulations, and to be used for ocean forecasting as well as process and climatic studies. Here, the scientific and technical choices within Nemo-Nordic are introduced, and the reasons behind the design of the model and its domain, and the inclusions of the two seas, are explained. The model's ability to represent barotropic and baroclinic dynamics, as well as the vertical structure of the water column, is presented. Biases are shown and discussed. The short term capabilities of the model are presented, and especially its capabilities to represent sea level on an hourly timescale with a high degree of accuracy. We also show that the model can represent longer time scale, with a focus on the Major Baltic Inflows and the variability of deep water salinity in the Baltic Sea.

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Nemo-Nordic is a regional ocean model based on a community code (NEMO). It covers the Baltic and the North Sea area and is used as a forecast model by the Swedish Meteorological & Hydrological Institute. It is also used as a research tool by scientists of several countries to study for example the effects of climate change on the Baltic and North Seas. Using such a model permits to understand key processes for this coastal ecosystem and how such processes will change in a future climate.
Nemo-Nordic is a regional ocean model based on a community code (NEMO). It covers the Baltic and...
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