Saturday, May 2, 2015
New Temperature Versions
Since satellites tend to have issues at the poles as do "surface" stations, I tend to prefer looking at the tropics, specifically tropical oceans since they represent the lion's share of total energy. The chart above compares the UAH beta version with the newest version of ERSST. What I see is a pretty fair comparison considering all the issues involved with both products. There is a very small difference in the two trends and as usual the lower specific heat troposphere has more variation than the high thermal mass ocean surface/sub-surface. I am of course no body, so I will leave it to the 'spurts to really screw this up.
Since land "surface" temperature is an average of Tmax and Tmin and there are rumors the Tmin is suspect due to nocturnal atmospheric boundary layer variation, I am staying out of that mess. What will likely the case though is the longer the interpolation range the greater the discrepancy between UAH and whatever land "surface" data set.
Nick Stokes has his critique on his blog and Roy Spencer has his pretty detailed explanation of the changes on his blog.