# ACCESS-ESM1.5: Release Information

**URL:** <https://forum.access-hive.org.au/t/access-esm1-5-release-information/2352>\
**Category:** ACCESS-NRI Releases\
**Tags:** release, model, access-esm15\
**Created:** [21 August 2024 12:16 UTC](https://forum.access-hive.org.au/t/access-esm1-5-release-information/2352 "2024-08-21T12:16:23Z")\
**Posts on this page:** 1\
**Showing post:** 5

<div class="post-metadata">

**Author:** ![spencerwong](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.access-hive.org.au/spencerwong/32/1894_2.png) [@spencerwong](https://forum.access-hive.org.au/u/spencerwong)\
**Post date:** [4 February 2025 04:06 UTC](https://forum.access-hive.org.au/t/access-esm1-5-release-information/2352/5 "2025-02-04T04:06:54Z")

</div>

# **ACCESS-ESM1.5**

🚀 **Release** : 1.2

[https://github.com/ACCESS-NRI/access-esm1.5-configs/releases/tag/release-preindustrial%2Bconcentrations-1.2](https://github.com/ACCESS-NRI/access-esm1.5-configs/releases/tag/release-preindustrial%2Bconcentrations-1.2)

[https://github.com/ACCESS-NRI/access-esm1.5-configs/releases/tag/release-historical%2Bconcentrations-1.2](https://github.com/ACCESS-NRI/access-esm1.5-configs/releases/tag/release-historical%2Bconcentrations-1.2)

## Getting started

- [How to run ACCESS-ESM1.5 tutorial on the Hive Docs](https://access-hive.org.au/models/run-a-model/run-access-esm/)

## Updates

✅ UM code update for controling orbital parameters at runtime [#115](https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/115), [#116](https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/116)  
✅ Include reduced “spinup” diagnostic profiles suitable for long spin-up and paleoclimate simulations [#105](https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/105), [#106](https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/106)  
✅ Include basin mask ocean input file for proper saving of basin specific diagnostics [#101](https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/101), [#102](https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/101)  
✅ Change processor decomposition for better performance [#109](https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/109), [#110](https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/110)  
✅ Fix incorrectly saved atmosphere variable `2,290 TOTAL DOWNWARD PAR FLUX AT SURFACE` [#107](https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/107), [#108](https://github.com/ACCESS-NRI/access-esm1.5-configs/pull/108)  
✅ Compress large CICE log files [#532](https://github.com/payu-org/payu/pull/532)  
✅ Prevent simulations from using incorrect sea ice restarts [#539](https://github.com/payu-org/payu/pull/539)  
✅ Updated netCDF file names for converted atmosphere output [#93](https://github.com/ACCESS-NRI/um2nc-standalone/pull/93)  
✅ CASA-CNP variables are correctly named in the netCDF conversion [#157](https://github.com/ACCESS-NRI/um2nc-standalone/issues/157)

## Notes

- Orbital parameters can now be set at runtime in the UM `namelist` files. Instructions on controlling them are available [here](https://forum.access-hive.org.au/t/setting-orbital-parameters-in-esm1-5/4122).
- The new “spinup” diagnostic profiles produce a reduced amount of model output and are designed for long spin-up simulations. Please see [this post](https://forum.access-hive.org.au/t/preset-output-profiles-for-esm1-5/3629/4) for details on the variables saved.
- Basin specific ocean diagnostics (such as `temp_merid_flux_gyre_atlantic`) are now correctly saved. Please see [this topic](https://forum.access-hive.org.au/t/access-esm1-5-basin-ocean-heat-transports-incorrect/3674) for details on the previous issues.
- Increasing the number of processors allocated to the atmosphere by 48 cores was found to reduce the typical runtime by 10% with a negligible cost in SU usage. Large variations in walltimes were observed due to potential system-wide issues, however under typical circumstances the updated processor decomposition
- The new configurations use the updated um2nc version 1.1.0 for converting atmosphere outputs to netCDF. The new version produces netCDF filenames containing more information on dates and data frequencies. For example, `aiihca.paa1jan` and `aiihca.pea1jan` are now named `aiihca.pa-010101_mon.nc` and `aiihca.pe-010101_dai.nc`. This change in behaviour can be disabled by loading the older `payu/1.1.5` in the `UM_conversion_job.sh` job script.

## Limitations

🛑 Maximum model run-time of 1 year per queue submission  
🛑 Not directly compatible with equivalent CLEX `payu` configurations

## Known Issues

⚠ [Ice diagnostics measuring a rate are incorrect](https://forum.access-hive.org.au/t/issue-with-cice-diagnostic-dvidtt-in-access-esm-the-cmip6-pre-industrial-archive/2249/11)  
⚠ [Occasional extreme sea-ice thickness in isolated grid cells](https://github.com/ACCESS-NRI/access-esm1.5-configs/issues/32)  
⚠ The historical forcing configuration [does not reproduce CMIP6 r20 due to an error in the ancillaries for that experiment](https://github.com/coecms/access-esm/issues/15)  
⚠ [Model configurations do not reproduce equivalent CMIP6 simulations](https://github.com/ACCESS-NRI/access-esm1.5-configs/issues/123), possibly due to differences in model executables. Details on the impacts of this will be documented shortly.

## Credits

⭐ ACCESS-ESM1.5 was developed by CSIRO (Ziehn T, Chamberlain MA, Law RM, Lenton A, Bodman RW, Dix M, Stevens L, Wang YP, Srbinovsky J, 2020: The Australian Earth System Model: ACCESS-ESM1.5. _Journal of Southern Hemisphere Earth Systems Science_ **70** , 193–214, [https://doi.org/10.1071/ES19035](https://doi.org/10.1071/ES19035))  
⭐ `payu` configurations were adapted from [work by The Centre of Excellence for Climate Extremes (CLEX)](https://github.com/coecms/access-esm)  
⭐ Model build infrastructure @paulleopardi @harshula @TommyGatti  
⭐ Configuration development and testing @spencerwong @paulleopardi @MartinDix @anton @minghangli @dougiesquire @Aidan  
⭐ Related `payu` development @jo-basevi @spencerwong @anton  
⭐ Model post-processing @bend @spencerwong @MartinDix @atteggiani  
⭐ Testing and deployment infrastructure @TommyGatti @jo-basevi @Aidan  
⭐ Documentation @spencerwong @atteggiani @Aidan @jasmeen_kaur

## Support

Replies to this topic are disabled.

If you have specific questions about **this release** [follow the guidelines for requesting support from ACCESS-NRI](https://forum.access-hive.org.au/t/access-help-and-support/908).

If you have questions about #access-esm create a topic in #Earth System and tag it with #access-esm. If you require assistance [follow the guidelines for requesting help](https://forum.access-hive.org.au/t/access-help-and-support/908).

## Resources

- How to run the model: [Run ACCESS-ESM - ACCESS-Hive](https://access-hive.org.au/models/run-a-model/run-access-esm/)
- Model configuration repository: [GitHub - ACCESS-NRI/access-esm1.5-configs: Standard ACCESS-ESM1.5 configurations released and supported by ACCESS-NRI](https://github.com/ACCESS-NRI/access-esm1.5-configs)
- Model configuration releases: [Releases · ACCESS-NRI/access-esm1.5-configs · GitHub](https://github.com/ACCESS-NRI/access-esm1.5-configs/releases)
- Model version releases: [Releases · ACCESS-NRI/ACCESS-ESM1.5 · GitHub](https://github.com/ACCESS-NRI/ACCESS-ESM1.5/releases)
- Model paper: [CSIRO PUBLISHING | Journal of Southern Hemisphere Earth Systems Science](https://doi.org/10.1071/ES19035).

---

_[View the full topic](https://forum.access-hive.org.au/t/access-esm1-5-release-information/2352)._