Arctic Ice Melting Much Faster Than Thought: maybe they'll make amphibious SUVs
mikedf at amnh.org
Fri Nov 29 22:37:53 MST 2002
Globe & Mail
November 28, 2002
Arctic Ice Melting Much Faster Than Thought
NASA study shows about 9 per cent is disappearing every 10 years
by Alanna Mitchell
The vast expanse of permanent ice that has characterized the Arctic
Ocean for millennia is fated to disappear far faster than anyone
imagined, and will certainly be gone before the century is out, says
a NASA satellite study.
The startling survey shows that an area of ancient ice roughly as
large as Alberta is vanishing every decade as the climate warms.
Over the course of this survey, which ran from from 1978 to 2000,
about 1.2 million square kilometers of supposedly permanent ice
melted away -- more than the total area of Ontario.
And the rate of the melt -- roughly 9 per cent a decade -- is
speeding up, said physicist Josefino Comiso, senior scientist at
NASA's Goddard Space Flight Center in Maryland and author of the
"This year we had the least amount of permanent ice cover ever
observed," Dr. Comiso said.
His findings, published in Geophysical Research Letters, have caused
a stir because they show that the permanent ice cover is melting at
roughly three times the rate scientists had thought. If the melt
keeps up at this rate, the permanent ice cover at the top of the
Earth will be gone before the end of this century.
But Dr. Comiso doubts the melt will be as slow as that. Instead, as
the dense ice disappears and exposes the ocean for the first time in
millennia, the ocean will pull in greater and greater amounts of
solar energy. That is bound to speed up the rate of the melt, Dr.
As well, satellite data show that the surface temperature of the
permanent ice is rising at the rate of 1.2 degrees C every decade,
meaning that that could force the ice to melt even faster.
The findings have huge implications for global climate patterns.
Arctic snow and ice play a key role in controlling the planet's
temperature. They act as insulation, keeping heat and moisture in the
land and ocean and out of the atmosphere.
But once the ice and snow are gone, that dynamic will end and this
will affect climate all over the planet in ways scientists have not
yet begun to fathom.
The Arctic itself, so long forsaken, is likely to become humid and
warm. Animals and fish that thrive on the permanent ice and snow --
polar bears, for example -- are likely to die off, unable to survive
The cause of all this warmth, said Tom Agnew, a research
meteorologist with the Meteorology Service of Canada, is linked to
the greenhouse-gas emissions that humans are pumping into the
atmosphere as they burn fossil fuels.
And while Dr. Comiso's findings show that the warming and melting
cycle is happening faster than expected, scientists have long
predicted that the disrupted climate eventually will cause the
permanent Arctic ice to vanish. Instead, the Arctic Ocean will partly
freeze in the winter and thaw in the summer. Scientists do not
believe the thawing trend is reversible.
"This change is already taking effect," Mr. Agnew said. "The whole
system is very slow to start and also very slow to stop."
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