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ACCESS-OM2 v1.0: a global ocean-sea ice model at three resolutions

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Kiss, A, McC Hogg, A, Hannah, N, Boeira Dias, F ORCID: 0000-0002-2965-2120, Brassington, GB, Chamberlain, MA, Chapman, C, Dobrohotoff, P, Domingues, CM ORCID: 0000-0001-5100-4595, Duran, ER, England, MH, Fiedler, R, Griffies, SM, Heerdegen, A, Heil, P, Holmes, RM, Klocker, A ORCID: 0000-0002-2038-7922, Marsland, SJ ORCID: 0000-0002-5664-5276, Morrison, AK, Munroe, J, Nikurashin, M ORCID: 0000-0002-5714-8343, Oke, PR, Pilo, GS, Richet, O, Savita, A, Spence, P, Stewart, KD, Ward, ML, Wu, F and Zhang, X 2020 , 'ACCESS-OM2 v1.0: a global ocean-sea ice model at three resolutions' , Geoscientific Model Development, vol. 13 , pp. 401-442 , doi: 10.5194/gmd-13-401-2020.

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Abstract

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.

Item Type: Article
Authors/Creators:Kiss, A and McC Hogg, A and Hannah, N and Boeira Dias, F and Brassington, GB and Chamberlain, MA and Chapman, C and Dobrohotoff, P and Domingues, CM and Duran, ER and England, MH and Fiedler, R and Griffies, SM and Heerdegen, A and Heil, P and Holmes, RM and Klocker, A and Marsland, SJ and Morrison, AK and Munroe, J and Nikurashin, M and Oke, PR and Pilo, GS and Richet, O and Savita, A and Spence, P and Stewart, KD and Ward, ML and Wu, F and Zhang, X
Keywords: coupled modelling, sea-ice/ocean system, Antarctica, Southern Ocean
Journal or Publication Title: Geoscientific Model Development
Publisher: Copernicus GmbH
ISSN: 1991-959X
DOI / ID Number: 10.5194/gmd-13-401-2020
Copyright Information:

Copyright 2020 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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