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

Daohua Bi; Martin Dix; Simon Marsland; Siobhan O’Farrell; Arnold Sullivan; Roger Bodman; Rachel Law; Ian Harman; Jhan Srbinovsky; Harun A. Rashid; Peter Dobrohotoff; Chloe Mackallah; Hailin Yan; Anthony Hirst; Abhishek Savita; Fabio Boeira Dias; Matthew Woodhouse; Russell Fiedler; Aidan Heerdegen

doi:10.1071/ES19040

RESEARCH ARTICLE (Open Access)

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

Daohua Bi ^A ^I , Martin Dix ^A , Simon Marsland ^A ^B ^C , Siobhan O’Farrell ^A , Arnold Sullivan ^A , Roger Bodman ^D , Rachel Law ^A , Ian Harman ^E , Jhan Srbinovsky ^A , Harun A. Rashid ^A , Peter Dobrohotoff ^A , Chloe Mackallah ^A , Hailin Yan ^F , Anthony Hirst ^F , Abhishek Savita ^A ^B ^C , Fabio Boeira Dias ^A ^B ^C , Matthew Woodhouse ^A , Russell Fiedler ^G and Aidan Heerdegen ^C ^H

+ Author Affiliations

- Author Affiliations

^A CSIRO Oceans and Atmosphere, 107–121 Station Street, Aspendale, Vic. 3195, Australia.

^B Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Australia.

^C ARC Centre of Excellence for Climate Extremes, Sydney, Australia.

^D University of Melbourne, Melbourne, Australia.

^E CSIRO Oceans and Atmosphere, Canberra, Australia.

^F Bureau of Meteorology, Melbourne, Australia.

^G CSIRO Oceans and Atmosphere, Hobart, Australia.

^H Australian National University, Canberra, Australia.

^I Corresponding author. Email: Dave.Bi@csiro.au

Journal of Southern Hemisphere Earth Systems Science 70(1) 225-251 https://doi.org/10.1071/ES19040
Submitted: 20 December 2019 Accepted: 29 June 2020 Published: 8 October 2020

Journal Compilation © BoM 2020 Open Access CC BY-NC-ND

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.

Keywords: ACCESS-CM2, climate change, climate simulation, CMIP6, coupled climate model, evaluation, greenhouse gases, physical configuration, preindustrial spin-up, tuning and debugging.

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