Monday January 29, 2007

The Warming of Greenland

nytimes.com :

Mr. Schmitt, a 60-year-old explorer from Berkeley, Calif., had just landed on a newly revealed island 400 miles north of the Arctic Circle in eastern Greenland. Where the maps showed only ice, a band of fast-flowing seawater ran between a newly exposed shoreline and the aquamarine-blue walls of a retreating ice shelf. All over Greenland and the Arctic, rising temperatures are not simply melting ice; they are changing the very geography of coastlines. Nunataks - "lonely mountains" in Inuit - that were encased in the margins of Greenland's ice sheet are being freed of their age-old bonds, exposing a new chain of islands, and a new opportunity for Arctic explorers to write their names on the landscape. With 27,555 miles of coastline and thousands of fjords, inlets, bays and straits, Greenland has always been hard to map. Now its geography is becoming obsolete almost as soon as new maps are created.

The sudden appearance of the islands is a symptom of an ice sheet going into retreat, scientists say. Greenland is covered by 630,000 cubic miles of ice, enough water to raise global sea levels by 23 feet (7m). Carl Egede Boggild, a professor of snow-and-ice physics at the University Center of Svalbard, said Greenland could be losing more than 80 cubic miles of ice per year. "That corresponds to three times the volume of all the glaciers in the Alps," Dr. Boggild said. "If you lose that much volume you'd definitely see new islands appear."

Given the acceleration of tidewater-glacier melting, a sea-level rise of a foot or two in the coming decades is entirely possible, said Richard Alley, a geosciences professor at Pennsylvania State University. That bodes ill for island nations and those who live near the coast. "Even a foot rise is a pretty horrible scenario," said Stephen P. Leatherman, director of the Laboratory for Coastal Research at Florida International University in Miami. On low-lying and gently sloping land like coastal river deltas, a sea-level rise of just one foot would send water thousands of feet inland. Hundreds of millions of people worldwide make their homes in such deltas; virtually all of coastal Bangladesh lies in the delta of the Ganges River. Over the long term, much larger sea-level rises would render the world's coastlines unrecognizable, creating a whole new series of islands.

Such ominous implications are not lost on Mr. Schmitt, who says he hopes that the island he discovered in Greenland in September will become an international symbol of the effects of climate change. Mr. Schmitt, who speaks Inuit, has provisionally named it Uunartoq Qeqertoq: the warming island.

See also :

1. Scientists shocked as Arctic polar route emerges
2. Polar bears drown, islands appear in Arctic thaw

(2007-01-29 12:56:23 SGT) [Env] Permalink

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