I'm not speaking here of the IPCC ensembles of opportunity — which is ultimately a very silly procedure. (watertechbyrie.com)
The CMIP5 ensemble does not span the space of either parametric uncertainty or structural uncertainty in a thorough or strategic way; it is an ensemble of opportunity. (thewinnower.com)
Some discussion is provided on how to practically estimate the climate modelling uncertainty based on an ensemble of opportunity. (pacificclimate.org)