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Under the Midnight Sun

Bringing some of the mysteries of the universe a little closer to home.

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Owlscrying
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Joined: Mon Apr 03, 2017 3:21 am

Unread post Fri Dec 29, 2017 5:16 pm

Image
Image Credit: NASA

In September 2017, a new iceberg calved from Pine Island Glacier—one of the main outlets where the West Antarctic Ice Sheet flows into the ocean. Just weeks later, the berg named B-44 shattered into more than 20 fragments. On December 15, 2017, the Landsat 8 Earth-orbitng satellite took this image of the broken berg. An area of relatively warm water, known as a polyna, has kept the water ice free between the iceberg chunks and the glacier front. The polynya’s warm water could have caused the rapid breakup of B-44.

This image was acquired near midnight local time. Based on parameters including the azimuth of the Sun and its elevation above the horizon, as well as the length of the shadows, it is estimated that the iceberg rises about 49 meters above the water line. That would put the total thickness of the berg—above and below the water surface—at about 315 meters.

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Owlscrying
Posts: 2066
Joined: Mon Apr 03, 2017 3:21 am

Unread post Fri Dec 29, 2017 5:17 pm



Pine Island Glacier (PIG) is the fastest melting glacier in Antarctica—one that's responsible for a quarter of the frozen continent's ice loss, around 45 billion tons of ice each year. Satellite images taken on 26 September show an open-water gap emerging between the ice shelf and the iceberg, which is about two thirds the size of the Isle of Wight (103 square miles or 267 square km).

 

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