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Politics : Formerly About Advanced Micro Devices
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To: Brumar89 who wrote (947059)7/14/2016 7:44:06 PM
From: Wharf Rat  Read Replies (1) of 1576551
 
"I wonder if any of that would have any impact on temperatures?"

Does Urban Heat Island effect exaggerate global warming trends?

What the science says...
Select a level... Basic Intermediate
While urban areas are undoubtedly warmer than surrounding rural areas, this has had little to no impact on warming trends.


Climate Myth...
It's Urban Heat Island effect
A paper by Ross McKitrick, an economics professor at the University of Guelph, and Patrick Michaels, an environmental studies professor at the University of Virginia, concludes that half of the global warming trend from 1980 to 2002 is caused by Urban Heat Island. ( McKitrick & Michaels)

When compiling temperature records, NASA GISS go to great pains to remove any possible influence from Urban Heat Island Effect. They compare urban long term trends to nearby rural trends. They then adjust the urban trend so it matches the rural trend. The process is described in detail on the NASA website ( Hansen 2001).

They found in most cases, urban warming was small and fell within uncertainty ranges. Surprisingly, 42% of city trends are cooler relative to their country surroundings as weather stations are often sited in cool islands (eg - a park within the city). The point is they're aware of UHI and rigorously adjust for it when analysing temperature records.

skepticalscience.com
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