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Configuration and spin-up of ACCESS-CM2, the new generation Australian Community Climate and Earth System Simulator Coupled Model

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Bi, D, Dix, M, Marsland, S ORCID: 0000-0002-5664-5276, O'Farrell, S, Sullivan, A, Bodman, R, Law, R, Harman, I, Srbinovsky, J, Rashid, HA, Dobrohotoff, P, Mackallah, C, Yan, H, Hirst, A, Savita, A, Boeira Dias, F, Woodhouse, M, Fiedler, R and Heerdegen, A 2020 , 'Configuration and spin-up of ACCESS-CM2, the new generation Australian Community Climate and Earth System Simulator Coupled Model' , Journal of Southern Hemisphere Earth Systems Science, vol. 70, no. 1 , pp. 225-251 , doi: 10.1071/ES19040.

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Abstract

A new version of the Australian Community Climate and Earth System Simulator coupled model, ACCESS-CM2, has been developed for a wide range of climate modelling research and applications. In particular, ACCESS-CM2 is one of Australia’s contributions to the World Climate Research Programme’s Coupled Model Intercomparison Project Phase 6 (CMIP6). Compared with the ACCESS1.3 model used for our CMIP5 submission, all model components have been upgraded as well as the coupling framework (OASIS3-MCT) and experiment control system (Rose/Cylc). The component models are: UM10.6 GA7.1 for the atmosphere, CABLE2.5 for the land surface, MOM5 for the ocean, and CICE5.1.2 for the sea ice. This paper describes the model configuration of ACCESS-CM2, documents the experimental set up, and assesses the model performance for the preindustrial spin-up simulation in comparison against (reconstructed) observations and ACCESS1.3 results. While the performance of the two generations of the ACCESS coupled model is largely comparable, ACCESS-CM2 shows better global hydrological balance, more realistic ocean water properties (in terms of spatial distribution) and meridional overturning circulation in the Southern Ocean but a poorer simulation of the Antarctic sea ice and a larger energy imbalance at the top of atmosphere. This energy imbalance reflects a noticeable warming trend of the global ocean over the spin-up period.

Item Type: Article
Authors/Creators:Bi, D and Dix, M and Marsland, S and O'Farrell, S and Sullivan, A and Bodman, R and Law, R and Harman, I and Srbinovsky, J and Rashid, HA and Dobrohotoff, P and Mackallah, C and Yan, H and Hirst, A and Savita, A and Boeira Dias, F and Woodhouse, M and Fiedler, R and Heerdegen, A
Keywords: ACCESS-CM2, climate change, climate simulation, CMIP6, coupled climate model, evaluation, greenhouse gases, physical configuration, preindustrial spin-up, tuning, debugging
Journal or Publication Title: Journal of Southern Hemisphere Earth Systems Science
Publisher: CSIRO Publishing
ISSN: 2206-5865
DOI / ID Number: 10.1071/ES19040
Copyright Information:

Copyright 2020 BoMCC BY-NC-ND

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