>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?)
>Hi Bob -This is off-topic for this post, but I'm not quite sure where to put it.Have you seen any arguments made about man-made influences on the ENSO patterns (i.e. post-1976), etc.Based on your recent La Nina post, I was wondering if an anthropogenic influence on the Pacific Warm Pool could lead to stronger Ninos and thus the recent step changes of the past 3 decades.I read an older post of yours about the PWP index, which I believe showned a fairly stable rising trend (with drops and bumps from ENSO activity) since the 70's. I'm sure this has occurred to you, but just wondering about your thoughts. Thanks, as always.
>As a follow-up (sorry for the double post), I've read of the studies showing human impacts on the monsoon season (most not co2 related) in India.Could a chance in aerosols or other human influence from the India/China area lead to a slowly decreasing cloud cover over the PWP? That would theoretically lead to gradually increasing strength for Ninos, correct?
>John: I assume the other anthropogenic forcings in the studies you referred to were aerosols. Do those studies say whether the aerosols are cooling or warming the Indian Ocean? The other thing to consider is what part of the oceans would be impacted by the Asian aerosols. Also, do the OHC graphs confirm or contradict the studies?http://bobtisdale.blogspot.com/2010/02/ohc-linear-trends-and-recent-update-of.html