- #1
Andre
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I guess I just beat Ivan by posting this.
The abstract is http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v432/n7015/abs/432290a_fs.html.
Sounds like water is boiling at o degrees Celsius.
Some background on
urban heat island effect. (All not true anymore?!).
Anyone want to comment?
Cimate change sceptics 'wrong'
By Richard Black
BBC environment correspondent
Some say any warming that is measured is due to urbanisation
A major argument used by sceptics of global warming is flawed, a UK Met Office study in Nature magazine says.
This argument maintains that much recorded climate data is inherently unreliable because of where weather instruments are situated.
Most are in or near cities, which produce their own heat; so the rapid warming measured over the last century could be just a record of urbanisation.
The Met Office believes its study shows this "urban heat island" idea is wrong.
The analysis has been done by Dr David Parker. He used data for the last 50 years to create two separate graphs. One plots temperatures observed on calm nights, the other on windy nights.
If the urban heat island hypothesis is correct, he says, instruments should have recorded a bigger temperature rise for calm nights than for windy ones - because wind blows excess heat away from cities and away from the measuring instruments.
Opposing sides
But there is no difference between the curves. "It helps to answer the critics," Dr Parker told BBC News. ...cont
The abstract is http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v432/n7015/abs/432290a_fs.html.
Nature 432, 290 (18 November 2004); doi:10.1038/432290a
Climate: Large-scale warming is not urban
DAVID E. PARKER
Hadley Centre, Meteorological Office, Exeter EX1 3PB, UK
Controversy has persisted over the influence of urban warming on reported large-scale surface-air temperature trends. Urban heat islands occur mainly at night and are reduced in windy conditions. Here we show that, globally, temperatures over land have risen as much on windy nights as on calm nights, indicating that the observed overall warming is not a consequence of urban development.
Sounds like water is boiling at o degrees Celsius.
Some background on
urban heat island effect. (All not true anymore?!).
Anyone want to comment?