133 lines
4.4 KiB
Plaintext
133 lines
4.4 KiB
Plaintext
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(word processor parameters LM=8, RM=75, TM=2, BM=2)
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Taken from KeelyNet BBS (214) 324-3501
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Sponsored by Vangard Sciences
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PO BOX 1031
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Mesquite, TX 75150
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There are ABSOLUTELY NO RESTRICTIONS
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on duplicating, publishing or distributing the
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files on KeelyNet except where noted!
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September 2, 1993
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TIBETICE.ASC
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This file shared with KeelyNet courtesy of Rick Lawler.
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--------------------------------------------------------------------
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Ice Cores From Tibet Suggests Last 50 Years Warmest in
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10,000
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By DONALD J. FREDERICK, National Geographic
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For AP Special Features, May 21, 1993
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Braving frigid blasts and bouts of altitude sickness, scientists
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are drilling for ancient ice in some of the world's most
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inhospitable places.
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The ice cores they are extracting from Greenland, Antarctica and
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the lofty Tibetan Plateau will contain records of changes in Earth's
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climate over hundreds of thousands of years. The cores also should
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help answer questions about global warming.
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Eventually, snows that fell as long as a million years ago may be
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analyzed to see what the climate was like then.
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More than 28,000 feet of ice cores from various depths and
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locations are stored in 3.3-foot-long aluminum cylinders at the
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National Ice Core Laboratory in Denver, Colo., a facility run by the
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U.S. Geological Survey, the National Science Foundation and the
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University of Colorado. Instrumentation at the repository gives
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visiting scientists an opportunity to examine the cores.
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"Hopefully we'll go back about 250,000 years with the cores now
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being collected in Greenland," says Joan Fitzpatrick, technical
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director of the laboratory. "Ice is the only medium that enables us
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to get such a detailed record of the climate for such long periods."
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Some experts believe that increased levels of greenhouse gases
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such as carbon dioxide are producing a dangerous global warming
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trend. Others argue that the higher temperatures occur because of
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natural climatic variations over long periods of time. The ice cores
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could help resolve the debate.
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Working at altitudes as high as 21,000 feet, a Chinese-American
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scientific team has been extracting cores from ice caps on the
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remote Tibetan Plateau.
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Evidence from some of the ice indicates that temperatures in
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Central Asia have been warmer in the past 50 years than at any other
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time since the end of the last ice age 10,000 years ago, says Lonnie
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Page 1
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Thompson, leader of the U.S. group.
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Thompson, whose work in China has been supported by the National
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Geographic Society, sees similar trends in other parts of the world.
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Since 1963, more than 43 percent of the ice on Tanzania's Mount
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Kenya has disappeared. Glaciers are also vanishing in the Andes,
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where Thompson is taking ice cores.
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--------------------------------------------------------------------
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If you have comments or other information relating to such topics
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as this paper covers, please upload to KeelyNet or send to the
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Vangard Sciences address as listed on the first page.
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Thank you for your consideration, interest and support.
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Jerry W. Decker.........Ron Barker...........Chuck Henderson
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Vangard Sciences/KeelyNet
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--------------------------------------------------------------------
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If we can be of service, you may contact
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Jerry at (214) 324-8741 or Ron at (214) 242-9346
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Page 2
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