ACCESS

Overview

The Australian Community Climate and Earth-System Simulator (ACCESS) is a coupled climate and earth system simulator to be developed as a joint initiative of the Bureau of Meteorology and CSIRO in cooperation with the university community in Australia.

There are multiple configurations of ACCESS

Our goal is to assist researchers in using ACCESS coupled model as provided on the computing cluster at NCI. If you have any corrections, comments or contributions, please feel free to email us on cws_help@nci.org.au so that we can continue to update and upgrade the guides over time.

For the full list of ACCESS guides see Category:ACCESS

 

Model Versions

Coupled

Version	CMIP	Description
ACCESS-CM 2.0	CMIP 6	UM 10.6 + MOM 5 @ 1° + CICE + CABLE
ACCESS-CM 2.0	CMIP 6	UM 10.6 + MOM 5 @ 1°+ CICE + JULES
ACCESS-CM 2.0 N48		UM 10.6 @ N48 resolution + MOM 5 @ 1° + CICE + JULES
ACCESS-CM 2.0 Rescalable		UM 10.6 @ N48, N96 or N216 resolution + MOM 5 @ 1° + CICE + CABLE
ACCESS-ESM 1.5	CMIP 6	UM 7.3 + MOM 5 @ 1°+ CICE + CABLE with carbon cycle
ACCESS-CM 1.4		UM 7.3 + MOM + CICE + CABLE 2.0
ACCESS-CM 1.3	CMIP 5	UM 7.3 + MOM + CICE + CABLE
ACCESS-CM 1.0	CMIP 5	UM 7.3 + MOM + CICE + MOSES

Atmosphere-Only

Version	CMIP	Description
ACCESS-AMIP 2.0	CMIP 6	UM 10.6 + CABLE
ACCESS-AMIP 2.0	CMIP 6	UM 10.6 + JULES
ACCESS-ESM 1.5 AMIP		UM 7.3 + CABLE
ACCESS-AMIP 1.4		UM 7.3 + CABLE 2.0
ACCESS-AMIP 1.3	CMIP 5	UM 7.3 + CABLE
ACCESS-AMIP 1.0	CMIP 5	UM 7.3 + MOSES

Ocean-Only

Version	CMIP	Description
ACCESS-OM2		MOM 5 @ 1° + CICE
ACCESS-OM2-025		MOM 5 @ 0.25° + CICE
ACCESS-OM2-01		MOM 5 @ 0.1° + CICE
AusCOM		MOM + CICE

Guides

For information on accessing the code and setup of the environment, see the UM page

How to setup Pre-Industrial Control and Historical runs for CMIP5 Simulations (ACCESS 1.0)

• How to setup Historical Runs for CMIP5 Simulations in ACCESS 1.3
• Building ACCESS
• How to build ACCESS v1.4
• ACCESS CMIP5 Forcings
• DataMover

Coupled Model Crashes

If the model becomes unstable it may crash with a stack trace mentioning 'bi_linear_h', like

um7.3x             0000000001111A08  mpl_recv_                  67  mpl_recv.F90
um7.3x             000000000110AF66  gc_rrecv_                 168  gc_rrecv.F90
um7.3x             0000000000989C5D  bi_linear_h_              613  bi_linear_h.f90
um7.3x             0000000000CC92BC  ritchie_                 2557  ritchie.f90
um7.3x             00000000009DFB7D  departure_point_          382  departure_point.f90
um7.3x             00000000008AA46F  sl_thermo_                681  sl_thermo.f90
um7.3x             00000000006EC376  ni_sl_thermo_             778  ni_sl_thermo.f90

Standard practice in this case is to add a small perturbation to the theta field in the most recent atmosphere restart dump and then restart the simulation. This perturbation normally allows the model to proceed past the crash.

First make a backup of the atmosphere restart file, then run the script '~access/apps/pythonlib/umfile_utils/perturbIC.py' on the restart file, e.g.

module purge
module use ~access/modules
module load pythonlib/umfile_utils

# Make a backup
cp restart_dump.astart restart_dump.astart.bak

# Perturb the initial conditions
~access/apps/pythonlib/umfile_utils/perturbIC.py restart_dump.astart

For Payu runs (ACCESS-ESM):

• The error message can be found in the log file 'access.err' in the experiment directory
• Restarts are in the highest numbered archive/restartNNN/atmosphere directory
• The restart file is named 'restart_dump.astart'

Post Processing

Post-processing scripts to convert atmosphere output to NetCDF format and move the output to /g/data are available at https://git.nci.org.au/cm2704/ACCESS-Archiver. This can be run at any stage of the run, and will only process files that haven't yet been archived.

Publication of runs to ESGF requires further processing to put the data in CMOR format. We recommend working with CSIRO for this so all ACCESS runs are consistent, contact us at cws_help@nci.org.au for more information.

Unsupported Configurations

These configurations have been used previously but are not presently being supported

• ACCESS0.X Slab Reosc