The question of "urban heat island effect" looks to be accounted for in this research, the researchers go on to say...."We have looked at this problem again with a new model with much more physics in it and we find that it is much more complicated and there are many feedbacks but the temperature increase is not affected by the windspeed"......they (the researchers and not Leon Clifford) can come up with any amount of "new models", lets hope they inform us when the new model stands the test of time, I have no doubt that this is yet another report going to Mexico COP16.
Surface temperature increases appear to be independent of wind speed suggesting that urban heating is not responsible for the long-term observed surface warming trend, according to new research that is to be published.
A trend towards higher night time temperatures has been a significant element in the long-term increase in surface temperatures that has been observed, which had prompted some to speculate that the observed surface warming was a phenomena driven by increased urbanisation rather than greenhouse gas emissions – since urban surfaces shed heat at night which warms the surrounding air. This is known as the urban heat island effect.However, the urban warming effect is sensitive to winds with less warming apparent on windy nights than on calm nights. And research by David Parker of the UK Meteorology Office in 2004 suggested that the observed warming trend was independent of night-time wind conditions and therefore was not due to urbanisation. (See “Climate: Large-scale warming is not urban” by David E. Parker, Nature 432, 290 (18 November 2004) doi:10.1038/432290a - see link here
Subsequent research by Roger Pielke Sr and Toshihisa Matsui of the University of Colorado indicated that the long-term temperature trends over land should depend on height and strongly on wind speed - mostly due to alterations in the rate of nocturnal cooling - and therefore implied that urban warming could be a factor in the long-term increase in surface temperatures. (See “Should light wind and windy nights have the same temperature trends at individual levels even if the boundary layer averaged heat content change is the same?” by Roger Pielke Sr and Toshihia Matsui, published in Geophysical Research Letters, 32, No. 21, L21813, 10.1029/2005GL024407 - see link here
New research involves more detailed physics
But the new research suggests that this is less likely. The paper, “Screen level temperature increase due to higher atmospheric carbon dioxide in calm and windy nights revisited” by Gert-Jan Steeneveld of Wageningen University in the Netherlands and others, including Roger Pielke Sr, is to be published shortly in the Journal of Geophysical Research. The paper examines the physics of what happens to heat radiated from the ground and how it warms the air and affects the temperature, particularly at the 2m hieght widely used for temperature measurement.
"The surface heating is not due to the urban heat island effect. That is the main message of our paper," lead author Steeneveld told Reporting Climate Science. Com. "We have looked at this problem again with a new model with much more physics in it and we find that it is much more complicated and there are many feedbacks but the temperature increase is not affected by the windspeed".
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