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Pastimes : Current Events and General Interest Bits & Pieces
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To: Win Smith who started this subject11/30/2002 8:32:59 PM
From: Win Smith  Read Replies (2) of 603
 
THE ARCTIC PERENNIAL SEA ICE COULD BE GONE BY END OF THE CENTURY gsfc.nasa.gov

[ Apparently the Friends of Cheney haven't got a complete handle on NASA yet. Clip :]

Comiso used satellite data to track trends in minimum Arctic sea ice cover and temperature over the Arctic from 1978 to 2000. Since sea ice does not change uniformly in terms of time or space, Comiso sectioned off portions of the Arctic data and carefully analyzed these sections to determine when ice had reached the minimum for that area each year. The results were compiled to obtain overall annual values of perennial sea ice.

Prior to the complete data provided by satellites, most records came from sparsely located ocean buoys, weather stations, and research vessels.

The rate of decline is expected to accelerate due to positive feedback systems between the ice, oceans and atmosphere. As temperatures in the Arctic rise, the summer ice cover retreats, more solar heat gets absorbed by the ocean, and more ice gets melted by a warmer upper water layer. Warmer water may delay freezing in the fall, leading to a thinner ice cover in the winter and spring, which makes the sea ice more vulnerable to melting in the subsequent summer.
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