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Greenland’s ‘uplift’ makes ice loss hard to measure

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Data from GPS stations fixed on bedrock are offering an unprecedented look at the uplift process beneath Greenland. Beata Csatho, a geologist at the University at Buffalo, says the new results suggest earlier studies may have underestimated ice loss—past and present. “This research is a great first step toward better understanding how geologic processes below the surface of the Earth influence ice loss and, ultimately, sea level rise,” she says. “It opens up new opportunities for better understanding how the ice sheet is changing and interacting with the rocky layers of the Earth below it.” Greenland’s ice sheet sits on the Earth’s solid crust, which is in turn perched atop a softer layer of rock called the mantle. When the ice sheet loses ice, the crust underneath rises up (similar to the way in which a compressed spring will bounce up when pressure is removed). This uplift, called postglacial rebound, means that scientists can’t measure how much an ice sheet is shrinking by simply tracking changes in its surface elevation. They must also figure out how much of that elevation change is caused by the bedrock rising. The paper also hints that the mantle beneath Greenland is not uniform: The ice sheet’s southeast region has experienced unexpectedly rapid uplift rates of about 12 millimeters per year, suggesting that the mantle may be hotter and less viscous here, making it springier. “It’s a very exciting study,” Csatho says. “It’s a new and different way of understanding the ice sheet and this critical process of uplift.” Shfaqat A. Khan of the National Space Institute at the Technical University of Denmark (DTU Space) led the study, which appears in Science Advances.
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1011 episodes

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Archived series ("Inactive feed" status)

When? This feed was archived on December 10, 2016 06:08 (7+ y ago). Last successful fetch was on November 09, 2016 22:26 (7+ y ago)

Why? Inactive feed status. Our servers were unable to retrieve a valid podcast feed for a sustained period.

What now? You might be able to find a more up-to-date version using the search function. This series will no longer be checked for updates. If you believe this to be in error, please check if the publisher's feed link below is valid and contact support to request the feed be restored or if you have any other concerns about this.

Manage episode 161408668 series 1163687
Content provided by Newsbeat. All podcast content including episodes, graphics, and podcast descriptions are uploaded and provided directly by Newsbeat or their podcast platform partner. If you believe someone is using your copyrighted work without your permission, you can follow the process outlined here https://player.fm/legal.
Data from GPS stations fixed on bedrock are offering an unprecedented look at the uplift process beneath Greenland. Beata Csatho, a geologist at the University at Buffalo, says the new results suggest earlier studies may have underestimated ice loss—past and present. “This research is a great first step toward better understanding how geologic processes below the surface of the Earth influence ice loss and, ultimately, sea level rise,” she says. “It opens up new opportunities for better understanding how the ice sheet is changing and interacting with the rocky layers of the Earth below it.” Greenland’s ice sheet sits on the Earth’s solid crust, which is in turn perched atop a softer layer of rock called the mantle. When the ice sheet loses ice, the crust underneath rises up (similar to the way in which a compressed spring will bounce up when pressure is removed). This uplift, called postglacial rebound, means that scientists can’t measure how much an ice sheet is shrinking by simply tracking changes in its surface elevation. They must also figure out how much of that elevation change is caused by the bedrock rising. The paper also hints that the mantle beneath Greenland is not uniform: The ice sheet’s southeast region has experienced unexpectedly rapid uplift rates of about 12 millimeters per year, suggesting that the mantle may be hotter and less viscous here, making it springier. “It’s a very exciting study,” Csatho says. “It’s a new and different way of understanding the ice sheet and this critical process of uplift.” Shfaqat A. Khan of the National Space Institute at the Technical University of Denmark (DTU Space) led the study, which appears in Science Advances.
  continue reading

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