Posted by John Deeb (Twitter) on Jan 31st 2013, 12:46 PM EST
Perhaps this provides more detail:
"The land part of the combined data for the period before 2000 consists of GHCN (Global Historical Climatology Network) information provided by NCDC (the U.S.A.'s National Climatic Data Center), while that for the period after 2001 consists of CLIMAT messages archived at JMA. The oceanic part of the combined data consists of JMA's own long-term sea surface temperature analysis data, known as COBE-SST"
Posted by Stephen Wilde (forum) on Jan 31st 2013, 1:12 PM EST
So, it appears that Japan’s Meteorological agency is using adjusted GHCN data up to the year 2000, and from 2001 they are using the CLIMAT report data as is, without adjustments. To me, this clearly explains the divergence when you look at the NASA plot magnified and note when the divergence starts
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