I’ve been running some test simulations with ACCESS-ESM branching from the pre-industrial control. I’m interested in looking at the sea ice response, and in doing so, I’ve noticed a problem with the dvidtt (thermodynamic volume tendency) diagnostic every January. I’ve gone back into the CMIP6 archi…

This is a limitation in the ESM1.5 coupling which means all the variables measuring a rate are incorrect in the first output after a restart. These variables which are configured to output from CICE have this issue in ESM1.5: #cmip_variable definable_in_access access_variable(s) #sfdsi no f…

Thanks for posting @hrsdawson ! We’re finding someone to help with this. @sofarrell have you come across this before or do you have any thoughts?

Hi @hrsdawson and @dougiesquire , yes this is a known issue and on the list to be fixed for ACCESS ESM1.6, this data field and a number of other similar effected ones were not published for ACCESS ESM1.5 data in CMIP6. As you are picking up raw model data from the p73 archive then the data will s…

Great, thanks for clarifying @sofarrell , that’s good to know! So for my own understanding, will this still be a problem in the ACCESS-NRI supported version of ACCESS-ESM, when that’s released?

[image] hrsdawson: So for my own understanding, will this still be a problem in the ACCESS-NRI supported version of ACCESS-ESM, when that’s released? ACCESS-ESM1.5 I assume? Unless we fix it, then yes. Is this essential for your work? It sounds kinda terrible, but we can’t fix every known pro…

Thanks @Aidan . No, at this stage it’s not essential for my work, but I guess it is essential for me to know which diagnostics I should/shouldn’t trust :slight_smile: @dougiesquire thanks for the example gist showing which sea-ice variables/diagnostics are available in the ACCESS-ESM1.5 CMIP6 holdin…

[image] hrsdawson: Is that a CMIP6 naming protocol thing? Yup, all data published for CMIP must be “standardised”. Among many other things, this includes using a common set of variable names. You can find definitions of each of the monthly sea-ice variables in this table , for example. Note, …

great, thank you @dougiesquire !

If (and it’s a big IF) the CICE diagnostics defined standard_names in their netcdf metadata then you could use cf_xarray to write your notebooks and access the data through the standard_name it would work with raw and CMORised data https://cf-xarray.readthedocs.io/en/latest/selecting.html#by-standa…

This will be address for ESM1.6 by either making a fix to the CICE4 setup or moving to CICE5. Its captured in Erroneous diagnostics in ESM1.5 output · Issue #7 · ACCESS-NRI/cice4 · GitHub

Issue with CICE diagnostic `dvidtt` in ACCESS-ESM / the CMIP6 pre-industrial archive

Earth System

hrsdawson (Hannah Dawson) 25 July 2024 06:40 10

@Aidan I might need to revise this answer. Could turn out to be quite essential for what we want to do. I’ll get back to you next week about this.

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Issue with CICE diagnostic `dvidtt` in ACCESS-ESM / the CMIP6 pre-industrial archive

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