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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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Video: A Polar Disaster Movie
16 February 2014 4:30 pm
CHICAGO, ILLINOIS—It’s not a secret that the Arctic Ocean is turning from white to blue as sea ice retreats. But a video compressing 25 years of satellite data into a single minute still drew gasps in a session here yesterday at the annual meeting of AAAS, which publishes Science. The movie, created late last year with data from satellites and buoys, shows how each year’s sea ice cover pulses like an amoeba, expanding and contracting with the seasons—and ending almost every summer a little smaller than the year before. The video shows one reason why: The ice is getting younger. The Arctic Ocean continually loses thick, old ice, the kind that easily survives a warm summer, as currents sweep it out the Fram Strait, east of Greenland. Because of warmer Arctic temperatures, little multiyear ice forms to replace what’s lost. Over 25 years, the proportion of the ocean covered by ice at least four years old has dwindled from 26% to 7%, while the remaining ice is mainly thin, the product of one winter. That quickly melts the following summer, leaving the ocean barer and bluer than before. To participants in the AAAS session, devoted to how the Arctic ice loss could affect everything from commerce to weather patterns to national security, the video was a call to action.
See more of our coverage from AAAS 2014.
(Video credit: NOAA Climate.gov; Mark Tschudi)