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A Look at the New (and Improved?) GISS Land-Ocean Temperature Index Data

February 17, 2013

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.”


Bob concludes


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.

Enough said!

One Comment
  1. ianh permalink
    February 19, 2013 1:54 am

    [SNIP – Not Relevant – I assume you have no comment about what Bob Tisdale says]

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