“Does Hadley Centre Sea Surface Temperature Data (HADSST2) Underestimate Recent Warming?“. Anthony Watts knows that the politicians meeting in Cancun next week to discuss climate issues need the best scientific advice, so he’s gonna make sure its available to them, protected by a mountain of bullshit.

Here’s a chart from Bob Tisdale that Anthony wants you to look at and see a villainous adjustment in 1998 to make temperatures look hotter. But its a difference plot between two temperature sets, and all it shows is that when the newer sea surface temperature measurement methods replaced the older ones they slightly underestimated sea surface temperature correction.

Bob Tisdale's plot of the difference between the HADSST2 sea surface temperature measurements and the HADISST satellite measurements. The step "up" represents an overcorrection and hence an underestimate of true SST.