Comments on "Urban Bias in Area-Averaged Surface Air- for the 1880-1984 period, for cities with populations greater than 100 000 compared with those with less than Temperature Trends" 100 000 is actually 0.3°C (0.9°C-0.6°C) not 0.1 °C. This is The article "Urban Bias in Area-Averaged Surface Air Tem- part of the value of the global urban-heat-island effect for perature Trends," byT.R. Karl and P.D. Jones (March 1989) the period in question, but cities with populations less than is an important contribution to the question of the validity 100 000 have their own heat-island effect. Therefore, one of greenhouse-warming theories. Unfortunately, this article must add an additional, although small, value to 0.3°C, has some significant errors. presumably about 0.06°C based on equation (1) of Karl & The first is rather obvious. Equation (1), on page 266, Jones (1989). This makes the actual heat-island effect about should have +0.45 as the exponent, not the negative one 0.36°C. (I am including the 1880-1900 period because the shown. rate of urban growth then was relatively small and because The second error is much more serious. The article states, 0.1 °C is significant to only one figure.) In any case, the "Whe n Hansen
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Apr 1, 1990
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