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Antarctica: How current ice melts follow past patterns

Different regions of Antarctica are warming at different rates. This differential melting occurred similarly during ancient warming periods, researchers have found. Now scientists hope understanding the past will help them to better predict the future.  

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A West Antarctica Ice Sheet Divide researcher stands next to an ice core with data from 68,000 years ago. The current melting pattern of Antarctic ice sheets mirrors melts of ancient warming periods, researchers have found.

Kendrick Taylor/Desert Research Institute

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The modern meltdown of the Antarctic Ice Sheet mirrors the frozen continent's big thaw after the last ice age ended 20,000 years ago, a new study finds.

New ice core records from West Antarctica show the huge ice sheet started heating up about 20,000 to 22,000 years ago, 2,000 to 4,000 years earlier than previously thought. But in East Antarctica, which was higher in elevation, colder and drier than the West, the continent stayed in its deep-freeze cycle until 18,000 years ago. The results were published today (Aug. 14) in the journal Nature.

The mismatch between West and East is similar to today's Antarctica. Modern West Antarctica is one of the fastest-warming places on the planet. The middle of West Antarctica has warmed by 4.4 degrees Fahrenheit (2.4 degrees Celsius) since 1958, three times as fast as the overall rate of global warming. But relatively little warming — half a degree or less — has been measured in East Antarctica. [In Photos: Stunning Photos of Antarctic Ice]

Looking at how Antarctica melted in response to past climate change can help researchers better predict the ice sheet's future behavior, said lead study author T.J. Fudge, a doctoral student at the University of Washington. "This most recent deglacial warming is the spot in time we can look at to really understand how our climate goes through big changes," Fudge told LiveScience.

The study is based on an ice core more than 2 miles (3,405 meters) long, covering 68,000 years, the longest U.S. ice core ever drilled. The five-year effort to retrieve the core ended in December 2011. Scientists are only halfway through the ice, having analyzed 30,000 years’ worth of annual layers, according to a statement from the University of Washington.

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