Emulation, ±4 W/m² Long Wave Cloud Forcing Error, and Meaning

Guest post by Pat Frank My September 7 post describing the recent paper published in Frontiers in Earth Science on GCM physical error analysis attracted a lot of attention, consisting of both support and criticism. Among other things, the paper showed that the air temperature projections of advanced GCMs are just linear extrapolations of fractional…

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Model Charged with Excessive Use of Forcing

Guest Post by Willis Eschenbach The GISS Model E is the workhorse of NASA’s climate models. I got interested in the GISSE hindcasts of the 20th century due to an interesting posting by Lucia over at the Blackboard. She built a simple model (which she calls “Lumpy”) which does a pretty good job of emulating…