TIPMIP: Experiments requested by TIPMIP

[matthew-mizielinski]

General Issue: New experiments

TIPMIP have asked to add experiments to CMIP6Plus and their experiment definition appears to include the following set of experiments;

See here for diagramatic description of the experiments:

experiment id	activity id	experiment	tier	sub experiment id	parent experiment id	required model components	additional allowed model components	start year	end year	min number of years	parent activity id	description
esm-up2p0	TIPMIP	ramp up at X Gt C/yr to Global Warming Level of 2K at 0.2 K/decade	1	none	esm-piControl	AOGCM BGC	AER CHEM			100	CMIP
esm-up2p0-swl2p0	TIPMIP	zero emissions at global warming level of 2K	1	none	esm-up2p0	AOGCM BGC	AER CHEM			50	TIPMIP
esm-up2p0-swl2p0-50y-dn2p0	TIPMIP	ramp down from global warming level of 2K at 0.2 K/decade	1	none	esm-up2p0-swl2p0	AOGCM BGC	AER CHEM			100	TIPMIP
esm-up2p0-swl4p0	TIPMIP	zero emissions at global warming level of 4K	1	none	esm-up2p0	AOGCM BGC	AER CHEM			50	TIPMIP
esm-up2p0-swl4p0-50y-dn2p0	TIPMIP	ramp down from global warming level of 2K at 0.2 K/decade	1	none	esm-up2p0-swl4p0	AOGCM BGC	AER CHEM			100	TIPMIP
esm-up2p0-swl4p0-50y-dn2p0-swl2p0	TIPMIP	zero emissions at global warming level of 2K after ramp down from global warming of 4K	1	none	esm-up2p0-swl4p0-50y-dn2p0	AOGCM BGC	AER CHEM			50	TIPMIP

The experiment names are systematic, but do get a little long (33 characters max). I don't think this will cause any problems in CMOR, but we might need to confirm that the ESGF interfaces can handle this.

As far as suitability for CMIP6Plus goes, I think the match up with CMIP7's goals is sufficient.

@durack1 could you review the information above?

[durack1]

the metagrid ESGF interface maxes out at ~12 chars before ellipses creep in, not an issue for uniquely identifying info, but does mean that it will be harder to identify the esm-up2p0-swl2p0-5.. or longer experiment_id's. Presumably the esm-piControl is the CMIP6 experiment_id?

Below is the listing of source_id's that published esm-piControl sims to CMIP6:

ACCESS-ESM1-5 (860)
AWI-ESM-1-REcoM (313)
BCC-CSM2-MR (508)
CESM2 (2226)
CNRM-ESM2-1 (1548)
CanESM5 (1010)
CanESM5-CanOE (660)
EC-Earth3-CC (705)
GFDL-ESM4 (966)
GISS-E2-1-G-CC (573)
MIROC-ES2L (904)
MPI-ESM1-2-LR (1281)
MRI-ESM2-0 (1090)
NorESM2-LM (933)
UKESM1-0-LL (1172)

[matthew-mizielinski]

Presumably the esm-piControl is the CMIP6 experiment_id?

Correct -- this is already in the CMIP6Plus CVs as part of the DECK. Groups may use that as the parent or submit a new one (expecting UKESM1-1-LL esm-piControl will need to be included).

Regarding the length of the experiment id in the search index. This is an extreme case of something we already have (some of the DCPP experiments have long names too). Personal opinion is that as long as the experiment proposers are aware of the issue then this isn't a problem. We could request that the metagrid devs make that side bar expandable and (ideally) allow the contents of the selection boxes to adapt.

[durack1]

Presumably the esm-piControl is the CMIP6 experiment_id?

Correct -- this is already in the CMIP6Plus CVs as part of the DECK.

All looks good to me, is there any point in adding parent_experiment_id CMIP6:esm-piControl (we can't validate this within the repo, as this is using a standing prior-phase initialization) or is this starting to get into a tangle that we don't want to complicate ourselves with?