Antarctic has ‘switched’ now in Rapid destabilization and melt

 

From the Christian Science Monitor

 As Antarctica’s ice shelves collapse, the glaciers they buttress will contribute to sea level rise. Currently, the glaciers in the study, which lie along 500 miles of the southern Antarctic Peninsula coast, are losing some 56 billion tons of ice a year to the ocean, according to the new study.

The losses began suddenly in 2009 and come in addition to losses from the West Antarctic Ice Sheet, which is shedding 80 billion to 110 billion tons of ice a year, according to the study.

Some losses from nearby ice shelves have been underway for decades. But the seemingly abrupt onset of significant ice losses along the southern coast of the Antarctic Peninsula is an eye-opener, suggests Dr. Gardner of JPL.

Recent studies have shown that Antarctica’s two continental ice sheets are more sensitive to changes in ocean and air temperatures than previously thought, he notes. But as relatively warm water from deep reaches of the Southern Ocean moved onto the continental shelf, the thinning sped up, melting the ice shelves from underneath, the researchers of the new study concluded.