AWI-ESM2: integration of the known ECHAM fix for SSP simulations failing at the end of 2100

[Mccino]

Hi all,

I would like to follow up on Discussion #1319 and PR #567 regarding the ECHAM error:

Time out of bounds in set_time_weight

I encountered this error at the end of 2100 when running standard SSP scenarios with AWI-ESM, using setup version 2.1-paleodyn-2.5 and ECHAM 6.3.05p2 on Levante. I also found that the ECHAM sources in my AWI-ESM 2.6.2 installation do not include this fix.

A fix for completing the year 2100 was already documented in PR #567 and discussed again in #1319. However, applying it locally required manual changes to set_time_weight in both:

src/echam/mo_simple-plumes.f90
src/rad_src/mo_simple-plumes.f90

It seems that this issue has already been addressed in the ECHAM configuration used with REcoM.
Could the fix also be included in future AWI-ESM2 releases so that standard SSP simulations can complete the year 2100 without manual patching?

One additional point that may help others: after recompiling ECHAM, my existing experiment continued to use its previously copied executable. I needed to explicitly update the experiment binaries when resubmitting:

esm_runscripts your_runscript.yaml -e your_experiment --update-filetypes bin

Checking the executable checksums helped confirm that the updated binary was actually present in the run’s working directory.

Thanks and cheers,
Qiyun

[Mccino]

@ackerlar @christian-stepanek
Could you take a look and let me know who is coordinating the next AWI-ESM2 release?

[Mccino]

Update: the fix has now been merged into the 6.3.05p2-awiesm-2.1 branch of the AWI ECHAM repository by @ackerlar !
I have confirmed that the remote branch contains commit 1deca7e.

The correction covers both src/echam/mo_simple-plumes.f90 and src/rad_src/mo_simple-plumes.f90.