Massive Iceberg – 10 Times the Size of San Francisco – Breaks Off Brunt Ice Shelf in Antarctica

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A74 Iceberg

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New radar images, caught by the Copernicus Sentinel-1 objective, reveal a 1270 sq km iceberg breaking complimentary and moving away quickly from the drifting ice rack. Credit: Contains customized Copernicus Sentinel information (2021), processed by ESA, CC BY-SA 3.0 IGO

A huge iceberg, around 1.5 times the size of Greater Paris [or about 10 times the size of San Francisco], broke off from the northern area of Antarctica’s Brunt Ice Shelf on Friday 26th February. New radar images, caught by the Copernicus Sentinel-1 objective, reveal the 1270 sq km iceberg breaking complimentary and moving away quickly from the drifting ice rack.

Glaciologists have actually been carefully keeping an eye on the numerous fractures and gorges that have actually formed in the 150 m thick Brunt Ice Shelf over the previous years. In late-2019, a brand-new fracture was found in the part of the ice rack north of the McDonald Ice Rumples, heading towards another big fracture near the Stancomb-Wills Glacier Tongue.

This most current rift was carefully kept track of by satellite images, as it was seen rapidly crossing the ice rack. Recent ice surface area speed information stemmed from Sentinel-1 information showed the area north of the brand-new fracture to be the most unsteady – walking around 5 m daily. Then, in the early hours of Friday 26th, the more recent fracture expanded quickly prior to lastly breaking devoid of the remainder of the drifting ice rack.

ESA’s Mark Drinkwater stated, “Although the calving of the new berg was expected and forecasted some weeks ago, watching such remote events unfold is still captivating. Over the following weeks and months, the iceberg could be entrained in the swift south-westerly flowing coastal current, run aground or cause further damage by bumping into the southern Brunt Ice Shelf. So we will be carefully monitoring the situation using data provided by the Copernicus Sentinel-1 mission.”

Although presently unnamed, the iceberg has actually been informally called ‘A-74’. Antarctic icebergs are called from the Antarctic quadrant in which they were initially spotted, then a consecutive number, then, if the iceberg breaks, a consecutive letter.

The calving does not present a hazard to the currently unmanned British Antarctic Survey’s Halley VI Research Station, which was re-positioned in 2017 to a more protected place after the ice rack was considered risky.

Routine tracking by satellites use extraordinary views of occasions occurring in remote areas like Antarctica, and how ice racks handle to keep their structural stability in reaction to modifications in ice characteristics, air and ocean temperature levels. The Copernicus Sentinel-1 objective brings radar, which can return images despite day or night and this permits us year-round watching, which is particularly crucial through the long, dark, austral cold weather.



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