After earning his Ph.D. in Atmospheric Science from Colorado State University in 1991, Tom primarily engaged in creating NCDC's global land surface data set used to quantify long - term global climate change. (wmo.int)
The compilation of a hemispheric or global land surface data time series from irregularly distributed (in time and space) historical thermometer observations can never be «correct» in an absolute sense. (realclimate.org)
There are no big surprises in the analyzed results, but I think it was very important that this study was done in light of numerous controversies surrounding existing land surface data sets and their analysis methods. (dotearth.blogs.nytimes.com)