Gavin seperately but I can't believe entirely unrelatedly wrong Sensitive But Unclassified (from which I take my headline - geddit?).
So the point - in case you're so dull that you've missed it - is that UK ESM 1 rather seems to be a touch over-sensitive in its simulations of the C20C. And that just possibly that's linked to its rather higher-than-expected estimate of climate sensitivity. Which rather calls into question the credibility of said estimate of ECS. A feature it seems to share - see Gavins's post - with a number of other recent models. How to reconcile this with reality is a topic that will doubtless be explored by those rather more competent than me. Thought I did rather like this Twit: a lot of the same people who will bash this model for having a high ECS and not having a great fit to the instrumental record will, without a trace of irony, also tell you climate models are garbage bc they're tuned to match observations.
Aside: one of the things that pissed me off - particularly when I found myself writing it - was people saying that their climate model performed "well", when that was a meaningless ill-defined term running the full gamut of "it's a bit crap but let's hope no-one notices" to "oh dear".
This post brought to you by two and a half pints of "Nelson's Revenge".
* ONE MODEL, ONE VOTE
* SUFFER THE LITTLE WEASELS TO COME UNTO ME