Date: 22/06/2023
Participants: 22
Chair: @tiloz
Admin
@eunpalim will present next meeting (06/07/23), @ars599 the following meeting (20/06/07)
See speaker spreadsheet for details:
Tilo will be back in Australia in August, will consult with community on moving meeting to a new time slot.
Resource use
@tiloz has used 0.7MSU, will use 1.25MSU by the end.
@ars599 can use up some of the spare resources on CM2 SSP ensemble runs.
Make time next meeting to discuss shared experiments.
ACCESS-NRI Workshop
@wilma attended last meeting. Workshop Sept 5-8. First day is training day. Tue/Wed main NRI Workshop. Thu/Fri for working groups.
Monday training is mostly NRI organised: general skills, linux, git, GitHub, gadi. How to run a model, evaluate model output. Idea was to CM2. Too specific might not be a broad interest. Asking for input, let whoever is attending meeting know, can report back. Wanted to cover model evaluation, but might be too specific, e.g. iLamb.
Potential to have ESM WG specific training. COSIMA is running a hackathon. WG could do a changing land/sea mask-athon.
Next meeting to discuss program for NRI Workshop days, Tues/Wed. Input welcome.
Last meeting decided we only need one day. Need a committee to plan this? Adele is organising COSIMA meeting. Might be some overlap. Could either join, or join for some sessions/social events.
Fill in the poll!
Working group meetings will be in parallel. Affects this group more than others. Parallel and joint sessions? Need to think how to organise.
Should at least have a coupled modelling meeting in the morning of Thursday.
There will be a registration form for attending the workshop, will have the ability to indicate a desire to present a poster and/or a talk. Will go out shortly (next week?).
Monday training is still being decided. If ESM community members have training they want to deliver, please contact @rogeredberg. NRI can assist and facilitate this.
@Dietmar_Dommenget would like to hear about the model development plans.
Ben Evans has committed to having some NCI training.
@dkhutch will attend the ACCESS-NRI Workshop Program Committee meeting on behalf of the ESM WG.
CMIP7 Roadmap
Talk by @RachelLaw (CSIRO):
Slides: ACCESS-development-210623.pptx (481.4 KB)
CMIP7 waiting on IPCC meetings to fine-tune their timing.
FY 23/24: Model dev
FY 24/25: Model testing
FY 25/26: Base model simulations
FY 26/27: Additional model simulations
FY 27/28: Maximising impact
Australian CMIP7 Consortium: CSIRO (lead), ACCESS-NRI, NCI, Bureau of Meteorology, Universities. Have approached department. Can continue in the meantime without specific funding. Will require an oversight committee, project leadership team and project coordinator/manager or similar.
Model development paths: no one route to a model configuration for CMIP7.
Department wanted “options”: have an ambitious, with some less ambitious incremental possibilities.
Feedback:
- Definitely need a “fast” ESM model. Perhaps need a definition of “fast”. ESM1.5 is 60 MY/day. Would like something even faster, Dietmar had 100 MY/day simulation. Would like this to be a possible configuration.
- No separate group for model development. Perhaps in the future when the consortium is spun up there will be separate meetings.
- Will model dev will be parallel paths. Lots of simultaneous development. At some point decisions will have to be made. Start with ambitious, target CM3/ESM3 but must be realistic and make sure we have something viable.
- Don’t know timing of CMIP in detail.
- Want to use same model code, but switch options to enable slow/fast runs.
- Global stocktake will be in 2028, and that won’t change. There will be simulations required for this, and need to be required by 2027, regardless of CMIP timelines. Might need “targeted simulations”.
- A lot of discussion about emissions driven simulation, strong support from community to make this the standard for Scenario MIP. Need full interactive carbon cycle. Doesn’t exclude concentration driven, but focus will be emissions driven. Any net-zero simulation requires emissions driven.
- Paris Agreement and government targets are around emissions.
- Stocktake is about countries meeting their stated emissions targets.
- Is model development technically or scientifically driven? CABLE dev is driven by land use change for carbon accounting. Also aspects of ENSO are not so good in CM2 and need improvement.
- Once there is a model with output then community input can be incorporated.
- Model evaluation key to this to catch issues in development pathway.
- It may be good to have some talks in this group on what we think could be improved in the ACCESS climate model
What’s going on?
Any plans to improve WOMBAT? @matthew.chamberlain: Yes, Pearce will be starting later this year. Work on getting nitrogen/phosphate cycle into WOMBAT.
Any plans to use TOPAZ or COBALT from GFDL? WOMBAT is what we’re used to using. BLING is in MOM6 but very basic. COBALT is in MOM6. WOMBAT is intermediate in complexity between them. Need advice from BGC community about what to use. MOM6 can have long tracer time steps, maybe by a factor of 10x. No-one actively working on this in MOM6 in Australia. Would like to do so.
Strong zonal current along equator in CM2 0.25, @ars599 might have found the issue, and if so could run another 400 year run and share with community.
This is a wiki post , if you want to update any of the details in these meeting notes, or to add your own recollection of what was discussed then edit me