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Response to xchrom (Original post)

Thu Jan 31, 2013, 06:39 PM

3. Cities change temperatures for thousands of miles—(The net effect … global mean … nearly negligible)

[font face=Serif][font size=5]Cities change temperatures for thousands of miles[/font]

January 27, 2013

[font size=3]…

In a new study that shows the extent to which human activities are influencing the atmosphere, scientists have concluded that the heat generated by everyday activities in metropolitan areas alters the character of the jet stream and other major atmospheric systems. This affects temperatures across thousands of miles, significantly warming some areas and cooling others, according to the study this week in Nature Climate Change.

The extra “waste heat” generated from buildings, cars, and other sources in major Northern Hemisphere urban areas causes winter warming across large areas of northern North America and northern Asia. Temperatures in some remote areas increase by as much as 1 degree Celsius (1.8 degrees Fahrenheit), according to the research by scientists at the Scripps Institution of Oceanography; University of California, San Diego; Florida State University; and the National Center for Atmospheric Research.

At the same time, the changes to atmospheric circulation caused by the waste heat cool areas of Europe by as much as 1 degree C (1.8 degrees F), with much of the temperature decrease occurring in the fall.

The net effect on global mean temperatures is nearly negligible—an average increase worldwide of just 0.01 degrees C (about 0.02 degrees F). This is because the total human-produced waste heat is only about 0.3 percent of the heat transported across higher latitudes by atmospheric and oceanic circulations.


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Arrow 7 replies Author Time Post
xchrom Jan 2013 OP
Demeter Jan 2013 #1
xchrom Jan 2013 #2
CreekDog Feb 2013 #7
LineNew Reply Cities change temperatures for thousands of miles—(The net effect … global mean … nearly negligible)
OKIsItJustMe Jan 2013 #3
NoOneMan Jan 2013 #4
OKIsItJustMe Feb 2013 #5
NoOneMan Feb 2013 #6
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