Chinese climate scientists tactfully tell the IPCC that surface air temperature (SAT) trends over north China include a large component of urban warming

Chinese climate scientists tactfully tell the IPCC that surface air temperature (SAT) trends over north China include a large component of urban warming

March 10th, 2009 by Warwick Hughes

Ren et al 2008 measure urban warming in a north China grid box 33 to 43 degrees North and 108 to 120 degrees East by comparing temperature trends in groups of stations of different population size for the period 1961-2000. For a concise summary of the Ren et al 2008 paper, Urbanization Effects on Observed Surface Air Temperature Trends in North China

Their results are summarised in their Table 3 copied here and they conclude from this, assuming no urban warming in their Rural series which warms at 0.18 degrees per decade that urban warming in their various station groups is as shown in their Table 4 below.

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