Eduardo Zorita sent me an interesting paper today from Kiehl, a prominent climate modeler, analyzes the paradox of how GCMs with very different climate sensitivities nonetheless all more or less agree in their simulations of 20th century climate. Kiehl found that the high sensitivity models had low aerosol forcing history and vice versa. Kiehl observed: … Continue reading Kiehl (2007) on Tuning GCMs