Sophie Lewis – CBS News
A massive slab of ice, roughly the shape of Manhattan but more than 70 times larger, has sheared off from Antarctica and floated into the Weddell Sea. It is now the largest iceberg in the world, the European Space Agency (ESA) said.
Newly-calved iceberg A-76 was captured by satellites by the Copernicus Sentinel-1 mission, ESA said Wednesday. The space agency said that the surface area of the iceberg is 1,668 square miles (4,320 square kilometres), measuring 106 miles (170 kilometres) long and 15 miles (24 kilometres) wide.
The name of the iceberg refers to the region it first calved from. It is the 76th iceberg to be tracked by the U.S. National Ice Center.
For scale, the iceberg is larger than the state of Rhode Island. ESA notes that it is slightly larger than the Spanish island of Majorca.
A-76 broke away from the western side of the Ronne Ice Shelf, one of the largest of Antarctica’s ice sheets. It was first spotted by the Dr. Keith Makinson and the British Atlantic Survey and confirmed by the U.S. National Ice Center using Copernicus Sentinel-1 imagery.
The event pushes iceberg A-23A, which is 1,305 square miles (3,379 Square kilometres) and also floating in the Weddell Sea, into second place for the world’s largest icebergs.
Periodic calving of ice shelves is part of a natural cycle. Ted Scambos, a research glaciologist at the University of Colorado at Boulder, told Reuters that this calving does not appear to be linked to climate change.
Scambos said that the ice shelf was already floating in the sea before breaking off, so the event does not raise ocean levels, whereas glaciers and ice sheets, found on land, do raise sea levels when they break off into the ocean. He added that the Ronne Ice Shelf has “behaved in a stable, quasi-periodic fashion” over the past century.
But scientists believe the rapid disintegration of several large icebergs in recent years may be linked to global warming — these events are now happening more frequently. In just the past few years, researchers have become alarmed at several areas in Antarctica which are showing signs of instability due to a warming climate and shifting ocean and atmospheric currents.
images via European Space Agency