What independent confirmations of the globally gridded anomaly methods have been made?
In addition to the cross-checks available by comparing and contrasting GISS, CRU, NCDC, and JMA, several technical bloggers have created their own globally gridded temperature anomaly records. Jeff Id and Roman M Joseph at Residual Analysis Zeke Hausfather Nick Stokes Chad Herman Steven Mosher The “Clear Climate Code” project, which includes Nick Barnes and Dave Jones, refactored the GISTEMP code into python, uncovering some minor bugs, which were then corrected in the official GISTEMP code. Steve McIntyre, analyzing the GISTEMP product data sets, uncovered a discontinuity around the year 2000 which was subsequently corrected.
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