om3-mom6-single-column

This repository contains easily-relocatable single-column ACCESS-OM3-MOM6 configurations based on the single-column MOM6 configurations in the ocean_only/single_column directory of the MOM6-examples repository.

The configurations here have been modified to:

• use ACCESS-OM3 MOM6 (with stub ice and wave components)
• include WOMBAT biogeochemistry
• run with Payu
• use ocean parameters based on those used in ACCESS-OM3 25km configurations

This default branch uses JRA55-do repeat-year forcing and WOMBATlite biogeochemistry. Other configurations are available in other branches in this repo.

To run

Clone this repo and run:

$ module use /g/data/vk83/modules
$ module load payu
$ payu run

Performance

The approximate cost of running this configuration without modification is:

• Compute usage: 0.2 SU/year
• Model throughput: 500 years/day
• Total CPUs: 2

Changing the domain

The domain comprises 2x2 h-cells spanning 1x1 degree and can be easily relocated. Changing the location of the domain changes the:

• Ocean and BGC initial conditions
• Atmospheric forcing
• Chlorophyll climatology used for SW penetration
• WOMBAT sFe forcing
• Coriolis parameter
• [Optional] Ocean depth
• [Optional] Surface salinity restoring climatology
• [Optional] Surface temperature restoring climatology

Existing domains can be found in the ./domains directory. To use an existing domain, simply create a symlink in the base directory to the domain of choice as follows

$ unlink ./INPUT
$ ln -s ./domains/BATS ./INPUT

Creating a new domain

New domains can be easily created using ./domains/create_domain.sh

$ ./domains/create_domain.sh
Usage: ./domains/create_domain.sh --name=<name> --lon=<lon> --lat=<lat> [--depth=<depth>] [--srestore] [--trestore]

where, if:

• --depth=<depth> is not provided, the default depth is 6000m
• --srestore is not provided, no salinity restoring is configured
• --trestore is not provided, no temperature restoring is configured

E.g. the existing BATS domain was created as follows

$ ./domains/create_domain.sh --name=BATS --lon=-64.2 --lat=31.7
Created directory: ./domains/BATS
Creating supergrid... Done
Creating ocean mosaic... Done
Creating ESMF mesh... Done
Creating WOMBAT sFe forcing... Done
Creating CHL climatology for SW pen... Done
Creating MOM_override... Done

This creates a basic functioning domain that can be further modified as required. For instructions on how to use your new domain, see the previous section.