Jonathan Gregory wrote:
Dear all

"realization" is fine as a standard name. I had forgotten we had introduced it.
I withdraw my suggestion of ensemble_member_identifier.

Thus, the standard name (of realization) can be used to identify an ensemble
axis. I think that providing an axis attribute as well could be helpful: with
spatiotemporal axes we have both methods of identification, and it is possible
there might be ensemble axes in which realization was a not a good choice of
standard name.

Best wishes

Jonathan
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using Tigge and ENSEMBLES datasets as examples (with GDS willing to modify 
their output), it sounds like a modest proposal is to recommend either of these 
attributes to identify the ensemble coordinate variable:

axis = "ensemble"; standard_name = "realization";

with the idea of keeping it simple and follow paco's advice:

It was clear from the previous round of discussions that it would be very
difficult to aggregate ensemble members produced with different grids
using NetCDF3.

other standard names suggested are:
 experiment_id, source, forcing, experiment, model, institution

which would involve clarifying what they mean in this context, and try to 
answer jeremy's question:

what you do to maintain traceability back to the original model experiments.

is there someone who is willing to take this on and marshall this through the 
process?
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