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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 30 Apr 2019

Submitted as: model description paper | 30 Apr 2019

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Geoscientific Model Development (GMD).

ACCESS-OM2: A Global Ocean-Sea Ice Model at Three Resolutions

Andrew E. Kiss1,2, Andrew McC. Hogg1,2, Nicholas Hannah3, Fabio Boeira Dias2,4,5,6, Gary B. Brassington7, Matthew A. Chamberlain4, Christopher Chapman4, Peter Dobrohotoff4,5, Catia M. Domingues2,5,6, Earl R. Duran8, Matthew H. England2,8, Russell Fiedler4, Stephen M. Griffies9,10, Aidan Heerdegen1,2, Petra Heil6,11, Ryan M. Holmes2,8,12, Andreas Klocker2,6, Simon J. Marsland2,4,5,6, Adele K. Morrison1,2, James Munroe13, Peter R. Oke4, Maxim Nikurashin2,5, Gabriela S. Pilo2,5, Océane Richet4,14, Abhishek Savita2,4,5,6, Paul Spence2,8, Kial D. Stewart1,8, Marshall L. Ward9,15, Fanghua Wu16, and Xihan Zhang1,2 Andrew E. Kiss et al.
  • 1Research School of Earth Sciences, Australian National University, Canberra, Australia
  • 2ARC Centre of Excellence for Climate Extremes, Australia
  • 3Double Precision, Sydney, Australia
  • 4CSIRO Oceans and Atmosphere, Australia
  • 5Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia
  • 6Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, Australia
  • 7Bureau of Meteorology, Melbourne, Australia
  • 8Climate Change Research Centre, University of New South Wales, Sydney, Australia
  • 9NOAA Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA
  • 10Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, New Jersey, USA
  • 11Australian Antarctic Division, Kingston, Tasmania, Australia
  • 12School of Mathematics and Statistics, University of New South Wales
  • 13Memorial University of Newfoundland, St John’s, Canada
  • 14Centre for Southern Hemisphere Ocean Research, Hobart, Tasmania, Australia
  • 15National Computational Infrastructure, Australian National University, Canberra, Australia
  • 16Beijing Climate Centre, Beijing, China

Abstract. We introduce a new version of the ocean-sea ice implementation of the Australian Community Climate and Earth System Simulator, ACCESS-OM2. The model has been developed with the aim of being aligned as closely as possible with the fully coupled (atmosphere-land-ocean-sea ice) ACCESS-CM2. Importantly, the model is available at three different horizontal resolutions: a coarse resolution (nominally 1° horizontal grid spacing), an eddy-permitting resolution (nominally 0.25°) and an eddy-rich resolution (0.1° with 75 vertical levels), where the eddy-rich model is designed to be incorporated into the Bluelink operational ocean prediction and reanalysis system. The different resolutions have been developed simultaneously, both to allow testing at lower resolutions and to permit comparison across resolutions. In this manuscript, the model is introduced and the individual components are documented. The model performance is evaluated across the three different resolutions, highlighting the relative advantages and disadvantages of running ocean-sea ice models at higher resolution. We find that higher resolution is an advantage in resolving flow through small straits, the structure of western boundary currents and the abyssal overturning cell, but that there is scope for improvements in sub-grid scale parameterisations at the highest resolution.

Andrew E. Kiss et al.
Interactive discussion
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Andrew E. Kiss et al.
Data sets

COSIMA Model Output Collection COSIMA

Model code and software

The ACCESS-OM2 global ocean - sea ice coupled model Hannah et al.

Andrew E. Kiss et al.
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Publications Copernicus
Short summary
We describe new computer model configurations which simulate the global ocean and sea ice at three resolutions. The coarsest resolution is suitable for multi-century climate projection experiments, whereas the finest resolution is designed for more detailed studies over timespans of decades. The paper provides technical details of the model configurations and an assessment of their performance relative to observations.
We describe new computer model configurations which simulate the global ocean and sea ice at...