30 Nov 2012:
Accelerated Ice Sheet Melt
At Both Poles Documented in Study
The ice sheets of Greenland and Antarctica are losing three to five times as much ice annually
as they did two decades ago, a rate of ice loss equivalent to sea level rise of 0.04 inches per year, according to a new study supported by NASA and the European Space Agency
. In an analysis of data from 10 different
Arctic Tipping Point:
A North Pole Without Ice
Scientists say this year’s record declines in Arctic sea ice extent and volume are powerful evidence that the giant cap of ice at the top of the planet is on a trajectory to largely disappear in summer within a decade or two, with profound global consequences.
satellite missions, the international team of 47 experts calculated that the rate of melt in Greenland is five times greater than during the mid-1990s. While the new findings on total ice loss fall within the range produced by the Intergovernmental Panel on Climate Change in 2007, the new study provides a more definitive assessment that Antarctica’s ice sheets, like Greenland’s, are shrinking. Combined, these ice sheets have added .44 inches (11.1 millimeters) to sea levels worldwide since 1992, accounting for about 20 percent of total sea-level rise during that period. “This will give the wider climate science community greater confidence in ice losses and lead to improved predictions of future sea-level rise,” said Andrew Shepherd, a scientist at the University of Leeds and co-leader of the study, which is published in the journal Science
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