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According to the BEST findings, “urban warming does not unduly bias estimates of recent estimates of recent global temperature change”.
Richard Muller admits that UHI effects exist. For instance, he quotes the example of Tokyo where “excess warming of almost 2o /100 years has been estimated”. He goes on to describe the mechanisms by which UHI can increase temperatures, citing absorption of sunlight, increased heat storage of manmade surfaces, obstruction of re-radiation by buildings, absence of plant transpiration, differences in air circulation and other phenomena.
Currently GISS allow for this effect by making adjustments which result in a reduction in global temperatures of about 0.01C over the period 1900-2009. HADCRUT’s adjustment is slightly larger at 0.055C per century.
According to BEST, their own calculations can find no statistically significant UHI effect at all. Indeed they actually find a negative trend! Richard Muller explains this away by…
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The Delinquent Teenager
Climate Ponderings 