Watts Up With That?

Guest post by Bob Tisdale

THE ADDITION OF CMIP3 (IPCC AR4) HINDCASTS/PROJECTIONS TO GRAPHS

I’ve added a new feature to the graphs of the monthly sea surface temperature updates on a trial basis, and it is the multi-model mean of the CMIP3 hindcasts/projections for sea surface temperatures, presenting them in comparisons to the observed data. The observed and modeled linear trends are also shown. This is done for the global, hemispheric and ocean basin sea surface temperature anomalies. As you will recall, CMIP3 is the climate model archive used by the IPCC for its 4thAssessment Report (AR4). I haven’t decided whether to include the model simulation data and trends in each monthly update or to include them only on a quarterly basis; that is, for the monthly updates in March, June, September, and December. I’m leaning toward providing them on a quarterly basis, not only because they’re a…

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