A Look at the New (and Improved?) GISS Land-Ocean Temperature Index Data
By Paul Homewood
Last month I reported how GISS had changed their Ocean Temperature Sets from HADISST Reynolds to ERSST. Coincidentally (?) this change had added about 0.03C to the warming trend.
I will be the first to admit that I know very little about sea temperatures, and so deliberately never attempt to discuss them. I simply commented at the time
“This leads to the inevitable conclusion that the Reynolds dataset did not give them enough warming, so they looked for another set that did. If the data does not fit the conclusions, change the data! “
It is therefore reassuring that Bob Tisdale, who does understand the subject of sea temperatures very well, has followed up my post.
As Bob comments
“I decided to run a few comparison graphs to see if I could determine why GISS made the change. I’ll let you decide.”
That looks like two strikes against GISS for their switch to ERSST.v3b data:
(1) they’re now using a lesser quality sea surface temperature dataset during the satellite era
(2)that is not based on a peer-reviewed paper.