Urban heat island - Hutchinson encyclopedia article about Urban heat island Printer Friendly
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heat island
(redirected from Urban heat island)

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heat island

Large town or city that is warmer than the surrounding countryside. The difference in temperature is most pronounced during the winter, when the heat given off by the city's houses, offices, factories, and vehicles raises the temperature of the air by a few degrees. The heat island effect is also caused by the presence of surfaces such as black asphalt, that absorb rather than reflect sunlight, and the lack of vegetation, which uses sunlight to photosynthesise rather than radiating it back out as heat energy.



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The authors propose that such indicators might include access to public cooling centers during heat waves, the existence of early warning systems for heat waves, mitigation plans to reduce urban heat islands, the number and quality of surveillance systems available to collect data on climate--health effects, and the availability of local public health workers and task forces trained in climate change research, surveillance, and adaptation.
This is down to a phenomenon called an urban heat island, where the temperature in the city can be up to 10 degrees C higher than the surrounding countryside.
The building has a white roof with a solar reflective index of 78 to reduce the urban heat island effect.
 
 
 
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