Independent reconfiguration of the orbital parameters to simulate a new climate state

Earth System Paleoclimate
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Hello,

I am in the process of setting up an LGM climate simulation (which occurred around 21,000 years ago, or 21 ka) using ACCESS-ESM1.5. Since it was mentioned during the ACCESS breakout session that reconfiguring the orbital parameters ourselves is likely feasible for ACCESS-NRI to implement, I was wondering if I could do that instead of requesting compilation from the CMS team. @Aidan

There are others who would also like to independently adjust the orbital parameters for different climate states using this workflow. @gpontes @dkhutch

Additionally, it was mentioned that the new ACCESS-ESM release version generates NetCDF atmospheric outputs and that the calendar issue (like this) has been resolved. I was hoping to use this updated version for my experiment. Please note that my initial conditions would be based on a simulation configured for 49ka, not the pre-industrial (PI).

Thank you,
Himadri and others from the Paleo group

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Thanks Himadri, in case it helps to add the hashtag, please help.

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@spencerwong is looking into it.

I already added some tags.

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Hi @HIMADRI_SAINI, thanks for your post!

We’re hoping to pull the orbital parameters from the UM source code into a namelist for the next release version of the ESM1.5 configurations, along with fixes for a few other issues/ideas that have come up. If everything looks to be working with the orbital parameters and the other changes we’ll aim to get the new versions out roughly in the next few weeks.

I’ll keep you updated! I think it will be great to test the changes to the orbital parameter setup with a paleo configuration to make sure its working correctly, and so it would also be great to compare the new version with some of the previous paleo simulations you have run.

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Thanks for working on this, Spencer. Yes, that sounds like a good idea. For now, I’ll ask the CMS team to provide the executables for this LGM configuration, since it’s still in an initial stage. Once we have the namelist ready, we can compare. We can also test it with a few other configurations our team has, like LIG, 49ka, 8.2ka, etc.

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Hi @HIMADRI_SAINI, a prerelease version of the executables with runtime orbital parameter settings is now available to test out. I’ve posted some details on using the prerelease executables here!

If everything looks ok with the prerelease, these changes will be brought into the next release of ESM1.5.

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Thanks a lot for your efforts on this, @spencerwong. This is great.

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