A new paper in the Journal of Geophysical Research reveals that as much as 44% of recent warming may be due to the Urban Heat Island effect, caused by increasing urbanisation around temperature measuring stations. The study looked at over 460 individual stations in East China:
The trends of urban heat island (UHI) effects, determined using OMR [observation minus reanalysis] and UMR [urban minus regional] approaches, are generally consistent and indicate that rapid urbanization has a significant influence on surface warming over east China. Overall, UHI effects contribute 24.2% to regional average warming trends. The strongest effect of urbanization on annual mean surface air temperature trends occurs over the metropolis and large city stations, with corresponding contributions of about 44% and 35% to total warming, respectively. The UHI trends are 0.398°C and 0.26°C decade−1. (source – abstract only)
There is no reason to doubt the fact that similar contamination of the surface record would be occurring elsewhere. Which helps to explain why the surface record diverges so noticeably from the satellite record, and why the satellite record should always be favoured.
[Also little Jimmy Hansen doesn’t get to carry out his special kind of “data cleansing” either – Ed]
h/t Hockey Schtick











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