Joint Seminar: ACCESS Coupled Model and Its Delivery to CMIP5

The Australian Community Climate and Earth System Simulator coupled model (ACCESS-CM) has been developed at the Centre for Australian Weather and Climate Research (CAWCR), a partnership between CSIRO and the Bureau of Meteorology. It is built by coupling the UK Met Office atmospheric unified model (UM), and other sub-models as required, to the ACCESS ocean model, which consists of the NOAA/GFDL ocean model MOM4p1 and the LANL sea-ice model CICE4.1, under the CERFACS OASIS3.2–5 coupling framework. The primary goal of the ACCESS-CM development is to provide the Australian climate community with a new generation fully coupled climate model for climate research, and to participate in CMIP5.

This presentation introduces the ACCESS-CM framework and components. It also shows the preindustrial control climates from two versions of the model, ACCESS1.0 and ACCESS1.3, together with some fields from the 20th century historical experiments, as part of model evaluation. The global average annual mean surface air temperature across the 500-year preindustrial control integrations shows a warming drift of 0.35 °C in ACCESS1.0 and 0.04 °C in ACCESS1.3, respectively. The historical simulations with both versions are in fair agreement with observations or comparable to the results from other CMIP5 models. The overall skills of ACCESS-CM in simulating a set of key climatic fields both globally and over Australia significantly surpass those from the preceding CSIRO Mk3.5 model delivered to CMIP3.

Further development of ACCESS-CM has been under way. A new version (ACCESS1.4) is to be released to Australian Climate Community for various applications, e.g., as the basis for the POAMA seasonal prediction system. ACCESS1.4 is originated from ACCESS1.3, with a few bug fixes, an updated land surface model (CABLE1.8 replaced with CABLE2.0), and a new coupler (OASIS3.2-5 replaced with OASIS3-MCT). A mid- to long-term (2~5 years) goal at CAWCR is to develop an “enhanced” version of ACCESS-CM (ACCESS2) which will be the principle contribution of CAWCR to CMIP6 for use in (possibly) an IPCC AR6.




16:00 h


Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg




Kenji Shimizu

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