# ACCESS-OM3 development highlights/updates

**URL:** <https://forum.access-hive.org.au/t/access-om3-development-highlights-updates/5902>\
**Category:** Working Group\
**Tags:** cosima\
**Created:** [11 February 2026 23:42 UTC](https://forum.access-hive.org.au/t/access-om3-development-highlights-updates/5902 "2026-02-11T23:42:37Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**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:** [6 August 2026 00:36 UTC](https://forum.access-hive.org.au/t/access-om3-development-highlights-updates/5902/14 "2026-08-06T00:36:57Z")

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# 2026-08-06

- 100km MOM6-CICE6-WW3 OM3 nearing release
- 100km MOM6-CICE6-WW3 OM3 load balancing complete
- 25km + 100km OM3 performance optimisation underway - gains of ~10% with MOM6 code changes and compiler directives
- implementation of river runoff spreading nearing completion
- code changes underway (splitting JRA55 runoff into river and basal melt) to allow basal melt to be input at depth, also accounting for latent heat
- 25km OM3 test4 assessment (**[all the evaluation for the latest ACCESS-OM3-25km test4 run here](https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2Faccess-om3-paper-1.readthedocs.io%2Fmc_25km_jra_iafwombatlite-test4-d28e0359-2026.07.000%2F&data=05%7C02%7Cu1164007%40anu.edu.au%7C216810b57d3f4a46f08708def0eecb20%7Ce37d725cab5c46249ae5f0533e486437%7C0%7C0%7C639213105594698623%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=IqWV8U2Uiy5WJn69NXiIRbnrHEZ8GQGCdI94LzeTi9g%3D&reserved=0)**) highlights areas that need improvement (details [here](https://forum.access-hive.org.au/t/cosima-working-group-announce/238/225))
  - thermocline too deep,
  - weak southern hemisphere heat transport,
  - SSS too fresh,
  - poor Kuroshio and Gulf Stream separation and variability distribution,
  - incorrect North Atlantic deep convection locations,
  - weak and declining NADW,
  - excessive Mediterranean outflow.

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