# Session 6: Breakout room 3: Model Configurations/ development - ACCESS-CM3/ESM3 **URL:** \ **Category:** CMIP7 Workshop\ **Tags:** workshop, cmip7\ **Created:** [1 March 2023 00:00 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507 "2023-03-01T00:00:06Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![NBateman-bit](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/nbateman-bit/32/45_2.png) [@NBateman-bit](https://forum.access-hive.org.au/u/NBateman-bit)\ **Post date:** [1 March 2023 00:00 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/1 "2023-03-01T00:00:06Z")
This topic contains discussions, questions and thoughts for Session 6: Breakout room 3: Model Configurations/ development - ACCESS-CM3/ESM3 Time: 11:15 am - 12:45 pm Martin Dix ---
**Author:** ![bgf](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/bgf/32/455_2.png) [@bgf](https://forum.access-hive.org.au/u/bgf)\ **Post date:** [1 March 2023 00:07 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/2 "2023-03-01T00:07:40Z")
Thanks - are there webex links to join each of these? ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 00:30 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/3 "2023-03-01T00:30:16Z")
Thanks - this is breakout 1c from yesterday’s list, right? ---
**Author:** ![NBateman-bit](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/nbateman-bit/32/45_2.png) [@NBateman-bit](https://forum.access-hive.org.au/u/NBateman-bit)\ **Post date:** [1 March 2023 00:41 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/4 "2023-03-01T00:41:52Z")
Yes, it is ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 00:48 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/5 "2023-03-01T00:48:47Z")
From Tilo’s talk: ![](https://us1.discourse-cdn.com/flex020/uploads/access1/original/1X/ef812844efdc588054623e87e91b65ca2b3fb50d.jpeg) ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 00:50 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/6 "2023-03-01T00:50:04Z")
AH: naming: CM3 should have OM3 in it TZ: depends how you distinguish configs - eg changes to non-OM components ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 00:51 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/7 "2023-03-01T00:51:37Z")
ME: are we aiming for CM3 for CMIP7 or too risky? MD: want to reflect what’s happening in the communities - don’t want to lose connection to ocean community modelling ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 00:53 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/8 "2023-03-01T00:53:19Z")
SM: timeline for UM upgrade ?: no additional science changes in uM but might be diagnostic changes; GC5 not entirely settled; not likely to make science changes ---
**Author:** ![AndyHoggANU](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/andyhogganu/32/43_2.png) [@AndyHoggANU](https://forum.access-hive.org.au/u/AndyHoggANU)\ **Post date:** [1 March 2023 00:53 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/9 "2023-03-01T00:53:34Z")
_Proposed Definitions of model versions_ ACCESS-AM3 - basically GAL9 CABLE-3 - Harmonised GitHub version of CABLE ACCESS-OM3 - MOM6-CICE6 ACCESS-CM3 - ACCESS-AM3+OM3+CABLE-3 ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 00:55 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/10 "2023-03-01T00:55:15Z")
HR: GC5 hight climate sensitivity to be addressed SO: radiation balance sensitivity testing discovered incorrect sea ice settings ---
**Author:** ![AndyHoggANU](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/andyhogganu/32/43_2.png) [@AndyHoggANU](https://forum.access-hive.org.au/u/AndyHoggANU)\ **Post date:** [1 March 2023 00:56 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/11 "2023-03-01T00:56:05Z")
I would advocate any interim versions (e.g. ACCESS-AM3+OM2 or ACCESS-AM2+OM3) could be badged as an ACCESS-CM2.5, etc ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 00:57 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/12 "2023-03-01T00:57:08Z")
?: UKMO aim to correct this in time for CMIP7 ?: do we need to wait for updated code of can we use current versions? MD: won’t be a problem TZ: we need to adapt what UKMO use - we’ll always be behind ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 00:58 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/13 "2023-03-01T00:58:45Z")
BGF: new dot point: aim - what we mean by CM3 - why would we consider MOM5 in CM3 when there’s a pathway for MOM6? - define model components - ACCESS land-ice model? can that fit timelines? ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 01:00 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/14 "2023-03-01T01:00:39Z")
?: part of the issue is the NUOPC coupler MD: this is just technical; enough work has been undertaken to know that this will work ?: coupler choice is irrelevant for land surface model (CABLE coupled via JULES) ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 01:00 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/15 "2023-03-01T01:00:56Z")
?: more staff available via ACCESS-NRI ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 01:02 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/16 "2023-03-01T01:02:29Z")
?: not just a technical issue - need to think through the science as well, eg. JULES science components - eg land issue led to excess sea salt aerosol - Jules 7.1 has been moving faster than expected ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 01:06 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/17 "2023-03-01T01:06:41Z")
?: timeline for 0.25° AM: probably this year without WW3; next year with WW3 TZ: COSIMA timeline ends 2025 - could be tight to then put this into a climate model ?: codebase vs configuration - can do a lot of work on early versions MD: it will be several months before UM-NUOPCis ready SO: still issues with C-grid coupling - mainly in tripolar region AH: global low-res has not been top priority to date due to regional; but could priorities global if this is important to have working for CM3 ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 01:07 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/18 "2023-03-01T01:07:21Z")
ME: is constraint on CM3 due to CMIP7 - just want CMIP7 capability or more/other things? ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 01:11 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/19 "2023-03-01T01:11:35Z")
TZ: CMIP7 sets the timeline irrespective of our MD: CMIP7 timeline not finalised - shortest due date would be hard to reach with NUOPC-based CM ?: beyond CMIP7 - LFRic on horizon - complete rewrite - how much do we want capability using absolute latest components HR: previously have had a “safe” path and an “aspirational” model - should we do this for CMIP7? Gives a fallback if CM3 is too ambitious to reach deadline SM: expect issues with CABLE coupling; not clear yet re. WOMBAT; also ice sheet coupling ---
**Author:** ![aekiss](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/aekiss/32/46_2.png) [@aekiss](https://forum.access-hive.org.au/u/aekiss)\ **Post date:** [1 March 2023 01:12 UTC](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507/20 "2023-03-01T01:12:43Z")
AH: define ACCESS-AM3, CABLE3, etc; CM3 shoudl include all these latest components; models that use older components would be CM2.x [Next page](https://forum.access-hive.org.au/t/session-6-breakout-room-3-model-configurations-development-access-cm3-esm3/507.md?page=2)