Hi All. One of 21stCenturyWeather’s aims is to be build a regional coupled model, combining high resolution atmospheric and ocean models. I posted this thread on the 21stCenturyWeather Cumulus website, but I thought I’d cross-post it here to get some extra attention (it was a little love-starved o…

Hi @Paul.Gregory , exciting to hear about the plans for the regional coupling! Just jumping in with a few details re CM3. @kieranricardo will be able to clarify in a bit more detail when he is back! As CM3 is still in development there is a bit of clean up that could still be done to make the suite …

Hi all. For rCM3 development I’d like to build a NUOPCY executable that can run inside a debugger. I need some advice as to the best way to achieve this: Currently, the CM3 config (latest branch is https://github.com/ACCESS-NRI/access-cm3-configs/tree/cm3-O100km-vn13.8 ) does the following (I thin…

An end of year update. Things we have learnt recently. You can’t run an ancil suite task with a domain without any land points. (This is mentioned in the ACCESS rAM3 release notes but the link to the work-around docs is broken). The ancil_lct task will run, but the downstream task ancil_lct_postpr…

[image] Paul.Gregory: (This is mentioned in the ACCESS rAM3 release notes but the link to the work-around docs is broken). @Paul.Gregory , FYI the link to the workaround has now been fixed in the ACCESS rAM3 release notes .

Some updates. @ashjbarnes has been working on rCM3 now for over a month. He has got both the UM and MOM6 to run in a regional configuration for one timestep, but the NUOCPY mediator fails at this point. Ashley is working closely with Kieran and Martin to reconcile this issue (created by the curren…

Some updates. @ashjbarnes has gotten the regional domains coupled. He’s currently working with @kieranricardo on defining the PE layout for the regional domains. We’ve managed to build regional UM ancillaries that respect the land-sea mask defined by rMOM6, which are then regridded to the target …

The road to regional coupled modelling (rCM3)

Earth System Coupled Model

heidi (Heidi Nettelbeck, ACCESS-NRI Atmosphere Modelling Team Lead) 7 January 2026 23:28 5

@Paul.Gregory, FYI the link to the workaround has now been fixed in the ACCESS rAM3 release notes.

Topic		Replies	Views
ACCESS-ROM3 setup instructions Regional MOM6 regional , tutorial , om3	78	1172	12 June 2025
Creating a regional ACCESS-OM3 TWG 21centuryweather	19	352	20 February 2025
Experiment: runs for CM3 development Experiments	2	80	21 May 2025
Running AM3 with COSP2 AM3 access-am3	35	179	10 March 2026
Community Talks 3: Andrew Kiss (ANU) Australia’s next-generation global ocean and sea ice model for CMIP7 and beyond ACCESS Workshop Day 2	3	91	4 September 2024

The road to regional coupled modelling (rCM3)

Related topics