We thank Ronald Stouffer and Robert Hallberg for helpful reviews of an earlier draft. KH was supported by the NOAA Climate and Global Change Postdoctoral Fellowship Program, administered by the University Corporation for Atmospheric Reserarch (Award NA06OAR4310199 from the NOAA Climate Programs Office). IMH would like to acknowledge a conversation with Adam Scaife in 2008 on the time scale of the response to the instantaneous return to preindustrial radiative forcing that helped motivate this study.
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