Massive Antarctic Iceberg – Twice the Size of New York City – on the Move

. Later, on January 25, 2023, the Operational Land Imager on Landsat 8 acquired these detailed views.

The first image shows the iceberg drifting in the Weddell Sea. The berg, which USNIC named Iceberg A-81, measured about 1550 square kilometers —about twice the area covered by New York City. The main berg is surrounded by smaller icebergs, sea ice, and a composite mix of ice types covered in snow called mélange.The second image, also acquired January 25 with OLI on Landsat 8, shows a detailed view of the smaller keystone-shaped iceberg between A-81 and the new front of the Brunt Ice Shelf.

According to Christopher Shuman, a University of Maryland, Baltimore County, glaciologist based at NASA’s Goddard Space Flight Center, satellite images indicate that the front of the Brunt Ice Shelf is now more than 20 kilometers back from its position in early 1973. The British Antarctic Survey’s , which was relocated farther inland in 2016, is now about 15 kilometers from the new front of the ice shelf. BAS reported that the station was unaffected by the recent break.

At the time of these images, Iceberg A-81 and other pieces of ice were drifting southward with the clockwise motion of the, although it remains to be seen where they will go from here. A previous berg that broke from the ice shelf in February 2021 followed the gyre. Its pieces now drift more than 500 kilometers away from Brunt near the Ronne-Filchner Ice Shelf.

NASA Earth Observatory images by Lauren Dauphin, using Landsat data from the U.S. Geological Survey. Caption by Kathryn Hansen with image interpretation from Christopher Shuman .

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