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NASA Spacecraft Reveals Dramatic Thinning of Arctic Sea Ice
The new results provide further evidence for the rapid, ongoing transformation of the Arctic's ice cover.
In the research, scientists from NASA and the University of Washington in Seattle conducted the most comprehensive survey to date using observations from NASA's Ice, Cloud and land Elevation Satellite, known as ICESat, to make the first basin-wide estimate of the thickness and volume of the Arctic Ocean's ice cover.
The Arctic ice cap grows each winter as the sun sets for several months and intense cold ensues.
In the summer, wind and ocean currents cause some of the ice naturally to flow out of the Arctic, while much of it melts in place.
But not all of the Arctic ice melts each summer, as the thicker, older ice is more likely to survive.
Seasonal sea ice usually reaches about 6 feet in thickness, while multi-year ice averages 9 feet.
Using ICESat measurements, scientists found that overall Arctic sea ice thinned about 7 inches a year, for a total of 2.2 feet over four winters.
The total area covered by the thicker, older "multi-year" ice that has survived one or more summers shrank by 42 percent.
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