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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 10
Geosci. Model Dev., 8, 3119–3130, 2015
https://doi.org/10.5194/gmd-8-3119-2015
© Author(s) 2015. 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., 8, 3119–3130, 2015
https://doi.org/10.5194/gmd-8-3119-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Development and technical paper 06 Oct 2015

Development and technical paper | 06 Oct 2015

Increasing vertical mixing to reduce Southern Ocean deep convection in NEMO3.4

C. Heuzé et al.
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Azaneu, M., Kerr, R., and Mata, M. M.: Assessment of the representation of Antarctic Bottom Water properties in the ECCO2 reanalysis, Ocean Sci., 10, 923–946, https://doi.org/10.5194/os-10-923-2014, 2014.
Bates, M. L., Griffies, S. M., and England, M. H.: A dynamic, embedded Lagrangian model for ocean climate models. Part I: Theory and implementation, Ocean Model., 59, 51–59, https://doi.org/10.5194/os-10-923-2014, 2012.
Briegleb, B. P., Danabasoglu, G., and Large, W.: An overflow parameterization for the ocean component of the community climate system model, Tech. rep, National Center for Atmospheric Research, Boulder, Colorado, 2010.
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Most ocean models, including NEMO, have unrealistic Southern Ocean deep convection. That is, through extensive areas of the Southern Ocean, they exhibit convection from the surface of the ocean to the sea floor. We find this convection to be an issue as it impacts the whole ocean circulation, notably strengthening the Antarctic Circumpolar Current. Using sensitivity experiments, we show that counter-intuitively the vertical mixing needs to be enhanced to reduce this spurious convection.
Most ocean models, including NEMO, have unrealistic Southern Ocean deep convection. That is,...
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