Ross McKitrick|Patrick J. Michaels
A test of corrections for extraneous signals in gridded surface temperature data
University of Guelph|University of Virginia
monthly surface temperature records 1979 2000 obtained 218 individual stations 93 countries linear trend coefficient determined sitethis vector trends regressed measures local climate well indicators local economic activity income gross domestic product gdp growth rates coal use data qualitythe spatial pattern trends shown significantly correlated nonclimatic factors including economic activity sociopolitical characteristics regionthe analysis repeated corresponding intergovernmental panel climate change ipcc gridded data similar correlations appear despite previous attempts remove nonclimatic effectsthe socioeconomic effects data shown add net warming bias although precise estimation magnitude require research