In early July, a rift in Antarctica’s Larsen C ice shelf caused the third-largest iceberg ever recorded to break off into the Southern Ocean.
The block of ice, dubbed iceberg A-68, may hang around for years in the open sea and is awesome in scale. It’s roughly the area of Delaware, has the mass of 5.6 Mount Everests, and is voluminous enough to fill Lake Erie more than twice.
However, because it’s the middle of winter in Antarctica, scientists have struggled to get good images of the iceberg. So far, they have relied on polar satellites like Sentinel-1, which uses radar to see through thick cloud cover.
A few days of clear weather in late July, however, gave Deimos-1 and Deimos-2 — a pair of satellites that operate as a tag-team — a clear, visible-light view of the scene on the eastern Antarctic Peninsula.
Deimos-1 and Deimos-2 follow similar orbits and work together to image the same spots on the ground in medium- and very-high-resolution
Deimos-1 (left) takes wider-angle, medium-resolution images while Deimos-2 (right) takes zoomed-in, very-high-resolution pictures.
In late July, Deimos-1 captured this image of the Antarctic Peninsula and the eastern edge of its Larsen C ice shelf -- where iceberg A-68 (center) broke off.
'Thanks to its wide swath and high revisit time, Deimos-1 spotted where the main developments were going on in the Larsen C Ice Shelf and its surroundings,' Ana Isabel Martinez, a writer for Deimos Imaging, wrote in a blog post.
Days later, Deimos-2 swung by and took two zoomed-in, very-high-resolution images of the iceberg and the rift that spawned it. This view shows a mid-eastern section of the rift.
Zooming in on some of the details from Deimos-2 is revealing. This image shows mini-icebergs in a slush of ice between A-68 and the main Larsen C ice shelf.
The sun -- low on the horizon during Antarctic winter -- casts long shadows that reveal the cliff-like edges of the rift and its iceberg chunks.
Similar details pop out in a scene of the iceberg's northernmost flank. On the top right, new cracks in the Larsen C ice shelf are visible.
Glaciologists say iceberg A-68 will continue to break into smaller chunks as it floats northeast and into the opens seas of the Southern Ocean.
The image above shows the paths other icebergs have taken after breaking off of Antarctica.
Most likely, iceberg A-68 will drift toward the warmer waters of Falkland Islands, though many larger icebergs go farther east to the South Georgia and South Sandwich Islands.
Source: Business Insider
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