October 05, 2005
More Global Warming Feedback
The New York
Times recently reported
on melting artic ice, which is another sign that global warming is entering a destructive feedback cycle. Normally, the
white surface of arctic ice reflects heat back into space. However, as the ice melts, the darker water
absorbs the heat, thus melting more ice and making it harder for new ice to
form each season.
The floating cap of sea ice on the Arctic Ocean shrank this summer to what is probably its smallest size in at least a century of record keeping, continuing a trend toward less summer ice, a team of climate experts reported yesterday.
That shift is hard to explain without attributing it in part to human-caused global warming, the team's members and other experts on the region said.
The change also appears to be headed toward becoming self-sustaining: the increased open water absorbs solar energy that would otherwise be reflected back into space by bright white ice, said Ted A. Scambos, a scientist at the National Snow and Ice Data Center in Boulder, Colo., which compiled the data along with the National Aeronautics and Space Administration.
"Feedbacks in the system are starting to take hold," Dr. Scambos said.
Image is from the New York Times article.
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