# Warm starts in the new release of ACCESS-ESM1.5

**URL:** <https://forum.access-hive.org.au/t/warm-starts-in-the-new-release-of-access-esm1-5/3775>\
**Category:** Earth System Model\
**Tags:** help\
**Created:** [8 October 2024 06:41 UTC](https://forum.access-hive.org.au/t/warm-starts-in-the-new-release-of-access-esm1-5/3775 "2024-10-08T06:41:26Z")\
**Posts on this page:** 1\
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**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:** [11 October 2024 01:50 UTC](https://forum.access-hive.org.au/t/warm-starts-in-the-new-release-of-access-esm1-5/3775/5 "2024-10-11T01:50:37Z")

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Hi @katner99,

I’ve had a look at the warm start scripts from [GitHub - coecms/esm-historical](https://github.com/coecms/esm-historical/tree/master), and it does look like the only changes we need are to adjust the way the sea ice restarts are handled.

I’ve uploaded a version of the scripts with some quick changes to a [gist here](https://gist.github.com/blimlim/1f103fbe8fac57e4176d1e094522a2f9), which are currently working when branching off the `PI-02` simulation in `/g/data/p73`.

* * *

I’ll outline the main changes in case any of the details are useful!

As mentioned in the previous topics [here](https://forum.access-hive.org.au/t/updating-esm1-5-configurations-for-payu-version-1-1-5/3126), ESM1.5 no longer uses the timing information given by the variables `init_data` and `initdate` from the `<control-directory>/ice/input_ice.nml` file, instead reading them from a new file `restart_date.nml` placed in the restart directory.

Likewise, the `runtime0` and `runtime` variables from the `<restart-directory>/ice/input_ice.nml` are no longer used.

As a result the parts of the warm start scripts which set these variables can be removed. These include the three sections [here](https://github.com/coecms/access-esm/blob/7db25e70a072b451ac7a0b637dc25d5899f0fc53/scripts/set_restart_year.sh#L38), [here](https://github.com/coecms/access-esm/blob/7db25e70a072b451ac7a0b637dc25d5899f0fc53/scripts/set_restart_year.sh#L73-L96), and [here](https://github.com/coecms/access-esm/blob/7db25e70a072b451ac7a0b637dc25d5899f0fc53/scripts/utils.sh#L37-L46) which I’ve either deleted or commented out in the updated version.

The final step is to make the new `restart_date.nml` file to carry the new timing information, which is added [here](https://gist.github.com/blimlim/1f103fbe8fac57e4176d1e094522a2f9#file-set_restart_year-sh-L80-L89).

* * *

Let me know if you have any questions about the changes to the scripts, or any issues with running them!

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