1980 NBC News Clip on “Contrails” That Can Change the Weather
(FEDERALJACK) A 1980 NBC news report on how contrails create cloud cover, which has an effect on the weather. It originally aired on 12/30/1980.
This is the research referenced:
http://www.isws.illinois.edu/pubdoc/CR/ISWSCR-236.pdf
Transcript:
Clouded Judgment: Do Jet Contrails Increase Cloud Cover?
JOHN CHANCELLOR, anchor:
On clear days, you can often see long white lines being traced high in the sky. They are contrails of jet aircraft. They’re actually long, slender clouds. Other men are finding them especially fascinating because the theory is being developed that those long, white lines may be changing our weather for the better. Details from Roger O’Neil.
ROGER O’NEIL, reporting:
The exhaust from jet engines, usually seen as long, thin trails of white clouds behind high-flying jet airplanes, may be a big reason why there are 30 fewer days of sunshine a year in the Midwest now than there were in 1900. The daily range between high and low temperatures has also narrowed. Weather researchers, studying cloud cover in 10 Midwestern states, found a sharp increase in cloudiness with the increase in commercial jet travel, particularly in the main East-West jet corridor, there were even more clouds. A jet produces a contrail or cloud because its exhaust consists primarily of water vapor.
RICHARD SEMONIN: (Illinois Institute of Natural Resources): In the absence of natural clouds, given the correct atmospheric condition, jet aircraft in high frequency can almost completely cover the atmosphere, visible atmosphere, with clouds.
O’NEIL: Semonin says, unlike most changes in the atmosphere caused by man, this one is beneficial. Clouds help farmers in the Midwest by blocking the sun. Temperature extremes can damage plants and speed up the evaporation of soil moisture. In the Winter, city people benefit because clouds act as a blanket, preventing warm air from escaping into the atmosphere. No one is trying to make clouds now using jet engines, but this study suggests that jet travel is inadvertently making our days more cloudy and some day, weather researchers may be able to use jets on purpose to change our weather. Roger O’Neil, NBC News, Champaign, Illinois.
2012-09-05 17:55:57
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