Little Change in Apparent Hydrological Sensitivity at Large CO₂ Forcing

Abstract Apparent hydrological sensitivity ( η a ), the change in global mean precipitation per degree K of surface warming, is key aspect climate system's response to increasing CO 2 forcing. To determine whether depends on forcing amplitude we analyze idealized experiments over broad range abrupt forcing, from 2× 8× preindustrial values, with two distinct models. We find little between and 4×CO , almost no beyond 5×CO . validate this finding under transient at 1%‐per‐year, up 8×CO further corroborate result by analyzing 1%‐per‐year output more than 15 CMIP5/6 Lastly, examine 1,000‐year long LongrunMIP model output, again This wealth results demonstrates that very weak function