Laptop Battery Most scientists blame people, at least in part, for global warming. Now, some researchers say people may be partly to blame for the cooling of Antarctica as well. While average global temperatures have risen about one degree Fahrenheit over the past century, Antarctica over all appears to have cooled slightly in the past few decades.
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Thinkpad That has been puzzling, because the polar regions are thought to be more sensitive to warming trends than the rest of the globe. Even more puzzling, a small portion of Antarctica the peninsula that stretches north toward South America defies the cooling trend. It has been warming very rapidly, about five degrees over the past 50 years, 10 times the global average.
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Microsoft Writing in today's issue of the journal Science, Dr. David W. J. Thompson, a professor of atmospheric science at Colorado State University, and Dr. Susan Solomon, a senior scientist at the National Oceanic and Atmospheric Administration in Boulder, Colo., argue that the ozone hole, which has opened up each spring over Antarctica in recent years, may help explain both contradictory trends.
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Laptop Computers "Ozone seems to be capable of tickling the Southern Hemisphere patterns," Dr. Thompson said in an interview.
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Laptop Computer A vortex of winds continually blows around Antarctica, tending to trap cold air at the South Pole. In the new paper, Dr. Thompson and Dr. Solomon show that the winds have strengthened in the past few decades, keeping the cold air even more confined.
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Desktop Computer The peninsula, which lies outside the wind vortex, escapes the cooling effect, the scientists said.
Notebooks They say the ozone hole may be the cause of the stronger winds.
Lenovo "That's where we speculate," Dr. Thompson said, "and the emphasis is on the word `may.' "
Hard Drive Close to the ground, ozone, a molecule consisting of three oxygen atoms, forms a large and unhealthy component of smog. High in the atmosphere, however, naturally occurring ozone is essential for life, blocking ultraviolet rays that would fatally mangle DNA.
Travelstar Artificial chemicals known as chlorofluorocarbons, or CFC's, once ubiquitous in aerosol spray cans and air-conditioner coolant, cause a chain of reactions that destroy ozone. In September 2000, the ozone hole opened up to a record 17.1 million square miles. With the most damaging CFC's now phased out, the ozone hole is expected to heal over the coming decades.
Gateway Until it does, however, fewer ozone molecules mean the atmosphere absorbs less ultraviolet radiation. Instead of warming the air, the rays bounce off the snow and ice of Antarctica and reflect back into space.
Laptop Parts Scientists already knew that the ozone hole had cooled the upper atmosphere. Dr. Thompson and Dr. Solomon show that the troposphere, the lowest six miles of the atmosphere, has also cooled.
Software "It's a lot of food for thought in there," said Dr. John E. Walsh, a professor of atmospheric science at the University of Illinois and an author of a paper in Science in January that indicated Antarctica was cooling.
Hard Drives Dr. Walsh said the data tying the cooling to stronger winds was convincing. "My one reservation," he said, "is the link to the ozone."
Electronics He noted that the ozone hole was usually largest in November or December, but that the greatest cooling had been about six months later.
Canon Dr. Thompson agreed that the ozone hole could not explain the whole climactic picture, and said other influences like ocean currents probably played important roles, too.
Desktop Pc "I seriously doubt it's the only player," he said. "I think it's one of many."
Desktop Computers By Kenneth Chang
New York Times - 5/3/2002
Topic: Climate Change
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