19 Apr '17, 2pm

New Rift on Petermann Glacier

The ice atop Greenland is not static. It slowly flows toward the coast and enters the ocean via outlet glaciers that ring the giant island. Petermann Glacier is one such “river” of ice. Like most glaciers that come in contact with the sea, Petermann has been known to periodically shed, or calve, icebergs. A new crack on the glacier has glaciologists watching Greenland’s northwest coast closely. The new crack, or “rift,” is visible in these images acquired on April 15, 2017, with the Operational Land Imager (OLI) on Landsat 8 . The first image shows a wide view of the glacier, including its front—where the glacier’s floating tongue meets the fjord’s ice-covered sea water. The second image shows a detailed view of the rift. “Rifting and calving are normal,” said Kelly Brunt, a glaciologist at NASA’s Goddard Space Flight Center. “However, if this new rift crosses Petermann an...

Full article: https://earthobservatory.nasa.gov/IOTD/view.php?id=90043&...

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