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One of the biggest icebergs, weighing trillion tonne, breaks off Antarctica: Scientists

Scientists said the iceberg, measuring 5,800 square km, calved away from the Larsen C Ice Shelf in Antarctica sometime between July 10 and 12.

world Updated: Jul 18, 2017 11:00 IST
This November 10, 2016, image obtained from Nasa shows the Antarctic Peninsula's rift in the Larsen C ice shelf from Nasa's IceBridge mission Digital Mapping System.
This November 10, 2016, image obtained from Nasa shows the Antarctic Peninsula's rift in the Larsen C ice shelf from Nasa's IceBridge mission Digital Mapping System. (AFP)

One of the biggest icebergs on record has broken away from Antarctica, scientists said on Wednesday, creating an extra hazard for ships around the continent as it breaks up.

The one trillion tonne iceberg, measuring 5,800 square km, calved away from the Larsen C Ice Shelf in Antarctica sometime between July 10 and 12, said scientists at the University of Swansea and the British Antarctic Survey.

The iceberg has been close to breaking off for a few months. Throughout the Antarctic winter, scientists monitored the progress of the rift in the ice shelf using the European Space Agency satellites.

“The iceberg is one of the largest recorded and its future progress is difficult to predict,” said Adrian Luckman, professor at Swansea University and lead investigator of Project MIDAS, which has been monitoring the ice shelf for years.

Map of Antarctica, showing the accelerating rift in the Larsen C ice shelf. (AFP)

“It may remain in one piece but is more likely to break into fragments. Some of the ice may remain in the area for decades, while parts of the iceberg may drift north into warmer waters,” he added.

The ice will add to risks for ships now it has broken off. The peninsula is outside major trade routes but the main destination for cruise ships visiting from South America.

This November 10, 2016, image obtained from Nasa shows a mosaic of a wider part of Antarctic Peninsula's rift in the Larsen C ice shelf from Nasa's IceBridge mission Digital Mapping System. (AFP)

In 2009, more than 150 passengers and crew were evacuated after the MTV Explorer sank after striking an iceberg off the Antarctic peninsula.

The iceberg, which is likely to be named A68, was already floating before it broke away so there is no immediate impact on sea levels, but the calving has left the Larsen C ice shelf reduced in area by more than 12%.

The Larsen A and B ice shelves, which were situated further north on the Antarctic Peninsula, collapsed in 1995 and 2002, respectively.

This file photo released by Nasa on December 1, 2016 shows a massive rift in the Antarctic Peninsula's Larsen C ice shelf on November 10, 2016. (AFP)

“This resulted in the dramatic acceleration of the glaciers behind them, with larger volumes of ice entering the ocean and contributing to sea-level rise,” said David Vaughan, glaciologist and director of science at British Antarctic Survey.

“If Larsen C now starts to retreat significantly and eventually collapses, then we will see another contribution to sea level rise,” he added.

This picture received from Nasa on June 1, 2017 shows an aerial view of the Larsen C ice rift in Antarctica. (AFP)

Big icebergs break off Antarctica naturally, meaning scientists are not linking the rift to man-made climate change. The ice, however, is a part of the Antarctic peninsula that has warmed fast in recent decades.

“In the ensuing months and years, the ice shelf could either gradually regrow, or may suffer further calving events which may eventually lead to collapse – opinions in the scientific community are divided,” Luckman said.

“Our models say it will be less stable, but any future collapse remains years or decades away.”