COSIMA TWG Meeting Minutes 2025

Date: November 5

Chair: @cbull

Minute taker: @helen

Attendees: @aekiss , @AndyHoggANU, @anton, @cbull, @Helen, @MartinDix, @minghangli, @sofarrell

CM3 dev evaluation meetings.

Next Tuesday there is an open CM3 dev evaluation meeting at 10:30am

This could be of interest to a broader COSIMA community. Action: @cbull to advertise this to COSIMA community

IAF beta release

@ezhilsabareesh8 is release coordinator for IAF 25k beta release. The purpose of this release is to give the experiment a human-readable name and makes it easier to align with other models such as CM3. There are plans to do a short test run before a release and after some bathymetry changes. There is a list of priorities on the project board (PO is priority, P1 is nice to have). Aiming to release in about 2 weeks.

Main changes for this release are an updated executable and bathymetry modification

OM3 evaluations

Hovmoller plots show funny temperatures in the vertical (at ~500 m). This is probably due to diffusivity from not parameterising the internal tides quite right. @aekiss and @AndyHoggANU to investigate further

The Indonesian throughflow has flows going through the wrong channels. Probably a bathymetry issue which was also present in OM2. @aekiss and @AndyHoggANU to formally raise this issue via the release project board. UPDATE: @aekiss created an issue.

@cbull has recently run all the OM3 evaluations on makefigs but half didn’t work. Most errors can be accounted for by a grid error that will be fixed in future runs. However, these evaluations will be needed over the next 2 weeks. @aekiss and @cbull to discuss next week.

Sulu sea

There is a channel in this region that is open but not by much. However, there is not a large resovear of water building up so happy to leave as is.

Discussion on potential future experiment runs

These are:

  1. There will probably be a CM3 100km run and an OM3 100k IAF could be run for comparison

  2. Sensitivity runs on mixing/subsurface temperature issues

Some of the planned future releases that may also need control experiment runs:

  1. 25 km config for upcoming release

  2. 8km config for future alpha release

  3. Panantarctic domain for future alpha release.

There is a table of current experiments here: