Guest Post by Bob Tisdale
This post is the annual model-data comparison of satellite-era sea surface temperatures. (For the most-recent longer-term model-data comparison of sea surface temperature data, see the post IPCC Still Delusional about Carbon Dioxide.) We’re taking a slightly new direction by presenting sea surface temperatures (modeled and observed) in absolute form, not anomalies, in the time-series graphs. Sea surface temperature anomalies are still used, however, for the trend maps and for the graphs showing trends on a zonal-mean (latitude-average) basis.
The initial reason for the switch to absolute sea surface temperatures was the unwarranted complaints about the model-data comparison I’ve been presenting recently, in which the models and data are shifted so that the trend lines intersect at zero in the first month of the time-series graph. See Figure 1. As you will soon discover, I’m being kind to the modelers with that graph.
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