University Of Tasmania
139718 - ACCESS-OM2 v1.0- a global ocean-sea ice model at three resolutions.pdf (28.02 MB)
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ACCESS-OM2 v1.0: a global ocean-sea ice model at three resolutions

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journal contribution
posted on 2023-05-20, 15:42 authored by Kiss, A, McC Hogg, A, Hannah, N, Boeira Dias, FB, Brassington, GB, Chamberlain, MA, Chapman, C, Dobrohotoff, P, Domingues, CM, Duran, ER, England, MH, Fiedler, R, Griffies, SM, Heerdegen, A, Petra HeilPetra Heil, Holmes, RM, Andreas KlockerAndreas Klocker, Marsland, SJ, Morrison, AK, Munroe, J, Maxim NikurashinMaxim Nikurashin, Oke, PR, Pilo, GS, Richet, O, Abhishek Savita, Spence, P, Stewart, KD, Ward, ML, Wu, F, Zhang, X

We introduce ACCESS-OM2, a new version of the ocean–sea ice model of the Australian Community Climate and Earth System Simulator. ACCESS-OM2 is driven by a prescribed atmosphere (JRA55-do) but has been designed to form the ocean–sea ice component of the fully coupled (atmosphere–land–ocean–sea ice) ACCESS-CM2 model. 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); 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 for testing at lower resolutions and to permit comparison across resolutions. In this paper, 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 parameterizations at the highest resolution.


Australian Research Council


Publication title

Geoscientific Model Development








Institute for Marine and Antarctic Studies


Copernicus GmbH

Place of publication


Rights statement

Copyright 2020 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

Repository Status

  • Open

Socio-economic Objectives

Effects of climate change on Antarctic and sub-Antarctic environments (excl. social impacts)