Such empirical estimates of circulation power are available in the literature. (judithcurry.com)
This study extends the existing analysis and presents the first empirical estimates. (ssa.gov)
There have been several other papers from GISS where GCM behavior was used to discount lower empirical estimates of sensitivity; one paper critical Stephen Schwartz's temperature autocorrelation based estimate of sensitivity immediately comes to mind. (climateaudit.org)