Gorgeous Satellite Image Reveals Galloping Antarctic GlacierLiveScience.com
By Becky Oskin 1 hour ago
This satellite image shows that parts of Pine Island Glacier flowed about 325 feet (100 meters) between March 3 and March 15, 2015.One of West Antarctica's largest glaciers surged a staggering 325 feet (about 100 meters) in less than two weeks this month, the European Space Agency reports.
Two radar images from the ESA's Sentinel-1A satellite on March 3 and March 15 reveal parts of the enormous Pine Island Glacier and its floating ice shelf making a swift trek toward the sea. The wild race to sea is typical for Pine Island Glacier, which flows up to 13,120 feet (4,000 m) every year.
"Pine Island is not speeding up," said Eric Rignot, an expert on Pine Island Glacier at the University of California, Irvine, and NASA's Jet Propulsion Laboratory in Pasadena, California.
However, Pine Island Glacier is one of the most rapidly changing features in West Antarctica. In recent decades, the colossal river of ice has sped up and grown markedly thinner. (As glaciers flow faster, they stretch out and thin.)
The glacier's grounding line — the zone where the ice loses contact with the ground and floats into the ocean — has also receded by nearly 20 miles (up to 30 kilometers).
Studies suggest this rapid change is due to warm ocean currents melting the ice from below.
Scientists are using satellites to monitor the quickly shifting ice and track its flow. Comparing radar images allows researchers to precisely measure small changes in Earth's surface of less than 0.25 inches (5 millimeters).
Covering more than 68,000 square miles (175,000 square kilometers), Pine Island Glacier drains some 10 percent of the ice flowing off western Antarctica. Its large floating ice shelf calved a huge iceberg in July 2013, part of a natural cycle that regularly spawns city-sized bergs.
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