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Answer to the "conundrum"

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theseeker





Joined: 25 Jul 2000
Posts: 3403
Location: Damnit...I'm a doctor jim
Answer to the "conundrum" PostWed Oct 31, 2001 12:56 am  Reply with quote  

New York Times

http://www.nytimes.com/2001/10/30/science/earth/30CONT.html

(To view the link with pic's you have to register it's free)

October 30, 2001

Briefly Empty Skies Offer Climate Clues
By ANDREW C. REVKIN

NASA
A satellite image from Jan. 26 shows the typical maze of contrails in the Washington area.

NASA
Satellite images from Sept. 12 show, from top, a lone contrail forming, then turning into a broad, heat-trapping cirrus cloud. With commercial flights halted, only nine military planes crossed an area from Ohio to Virginia.

The suspension of flights after the Sept. 11 attacks has provided scientists with a rare chance to improve their analysis of how aviation affects climate.

When the air above 25,000 feet is humid, the skies are laced with drifting streaks called contrails, created as ice crystals form on the exhaust plumes of hundreds of jets. The wind and gravity disperse the narrow contrails, which form wispy cirrus clouds.

This veil-like type of cloud allows sunlight in to warm the earth and traps some of the rising heat before it can radiate into space. This effect is thought to add slightly to a warming trend that scientists say is caused by heat-trapping gases released when fossil fuels are burned. The ideal way to measure such an effect would be to look at the same piece of sky when air traffic is heavy and when it is absent, said Dr. Patrick Minnis, a senior research scientist at the National Aeronautics and Space Administration's Langley Research Center in Hampton, Va.

But the skies are never devoid of aircraft. At least that was the case until Sept. 11. Since then, Dr. Minnis and others have been reviewing satellite images of clouds and contrails. Near dusk on the 11th, the only contrails in the East were three streaks heading from Nebraska to Washington, almost certainly Air Force One and its escort taking President Bush from Offutt Air Force Base to the White House, Dr. Minnis said. Everything matched, he said: "the trajectory and timing and the fact that nothing else was flying."

NASA requested that the image of the president's jet not be published, citing security risks.
The most valuable data were collected the next day. Only nine military flights crossed a region from Ohio to Virginia, an area normally cloaked in cirrus clouds from the 700 to 800 jets crossing daily, Dr. Minnis said. With those images, his team was able to chart precisely how those nine threadlike contrails fanned out over five hours to form a shield of cirrus clouds covering 24,000 square miles.

Dr. Minnis provided other satellite views of the area on a more typical day, Jan. 26, which show a broad area of clouds fringed by fading contrails. Having an isolated view of individual contrails spreading into clouds should allow scientists to refine computer systems that scan satellite images for contrails' effects, he said. Ultimately, he said, the observations in September will refine computer models of the overall effect of aviation on climate.


[Edited 1 times, lastly by theseeker on 10-30-2001]
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3T3L1





Joined: 08 Mar 2001
Posts: 1344
Location: Lubbock, Texas
PostWed Oct 31, 2001 1:12 am  Reply with quote  


NASA
Satellite images from Sept. 12 show, from top, a lone contrail forming, then turning into a broad, heat-trapping cirrus cloud. With commercial flights halted, only nine military planes crossed an area from Ohio to Virginia.
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theseeker





Joined: 25 Jul 2000
Posts: 3403
Location: Damnit...I'm a doctor jim
PostThu Nov 01, 2001 8:42 am  Reply with quote  

radiative forcing is all there is...plain and simple...

over at carnicom, the voices of psuedo science and psuedo reason offer their sputum....


http://pub8.ezboard.com/fchemtrailschemtrails.showMessage?topicID=5492.topic

I'm glad my tax dollars don't support carnicom's ambiguiously gay duo....

dj and sore throat..that is....


[Edited 2 times, lastly by theseeker on 11-01-2001]
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