>I had noted the addition of ERSST.v3b SST dataset to the GISTEMP map-making webpage back in the February 25, 2010 post WHEN DID GISS ADD ERSST.v3b DATA TO THEIR MAP-MAKING WEB PAGE? This month, GISS posted a link to the .pdf draft of a journal article “Current GISS Global Surface Temperature Analysis” on their GISS Surface Air Temperature Analysis webpage. GISS compares their HADISST/OI.v2 based data to the ERSST.v3b data in the draft of the paper. At the end of the Supplementary Material, page 32, they write, “Until improved assessments of the alternative SST data sets exist, the GISS global analysis will be made available for both HadISST1 and ERSST, in both cases with these longterm data sets concatenated with OISST for 1982-present. HadISST1+OISST will continue to be our standard product unless and until verifications show ERSST to be superior.”
And in the paragraph before that one, GISS acknowledges the impacts on short- and long-term trends, “The standard GISS global analysis uses the concatenated HadISST1+OISST data set, as described in the main text. Any of the alternative ocean data sets that we have described here would yield slightly greater global warming, both in recent decades and on the century time scale.” The differences in trends are illustrated in my post WHEN DID GISS ADD ERSST.v3b DATA TO THEIR MAP-MAKING WEB PAGE?
(BTW, I hate words like “concatenate”, which basically means link or splice. Why not use a word that the vast majority of people will understand, so they won’t have to spend time checking a dictionary?)