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permafrost, nsidc, kevin schaefer, alaska, barrow101 viewsAndy Parsekian, Kevin Schaefer, and Lin Liu use a ground penetrating radar to measure the depth of an ice wedge on August 15, 2013. The survey line lies perpendicular to the ice wedge and similar ice wedges crisscross the tundra in the background (Credit: Elchin Jafarov, NSIDC).
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101 viewsLin Liu pulls a ground penetrating radar unit through the tundra in rainy weather. The survey near Barrow, Alaska measures active layer depth. The radar unit (in the box) emits a pulse which reflects off the permafrost to measure the active layer depth, which is recorded in the computer held by Andy Parsekian. (Credit: Kevin Schaefer, NSIDC)
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permafrost, nsidc, kevin schaefer, alaska, barrow100 viewsKevin Schaefer pulls a ground penetrating radar unit through the tundra near Barrow, Alaska on August 14, 2013 to measure the active layer depth. The radar unit (in the box) emits a pulse which reflects off the permafrost to measure the active layer depth, which is recorded in the computer held by Andy Parsekian (Credit: Elchin Jafarov, NSIDC).
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100 viewsLin Liu checks the day's data at basecamp. (Credit: Kevin Schaefer, NSIDC)
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