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62 viewsA herd of several thousand caribou stalled our progress as they crossed the Dalton highway near Deadhorse, Alaska on July 12, 2009. (Credit: Tingjun Zhang, NSIDC)
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61 viewsDriving the Dalton Highway on August 15, 2012 becomes difficult as visibility drops to zero on Atigun Pass in the Brooks Range, Alaska. (Credit: Kevin Schaefer, NSIDC)
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61 viewsThis permafrost core extracted from a depth of 1.5 meters on August 20, 2012 near Toolik Lake, Alaska has been frozen for thousands of years, yet green moss is visible at the 9 centimeter mark. (Credit: Kevin Schaefer, NSIDC)
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61 viewsStandford University scientist Lin Liu and research volunteer Tim Schaefer are attempting to remove a drill bit that accidently froze into the permafrost at a site just south of Deadhorse, Alaska on July 11, 2009. The researchers spent eight hours chipping the drill bit out of the permafrost using a crowbar, pry bar, and a hammer (Credit: Kevin Schaefer, NSIDC)
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61 viewsDawn finds Kevin Schaefer and Tim Schaefer still sleeping at camp near the Sagavanirktok River south of Deadhorse, Alaska on August 16, 2012. Mud makes the trucks appear brown, although their true colors are red and blue (Credit: Tingjun Zhang, NSIDC).
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60 viewsTim Schaefer slakes his thirst with ice chopped from an exposed ice layer at a thermokarst feature on August 19, 2012 near Toolik Lake, Alaska. (Credit: Kevin Schaefer, NSIDC)
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59 viewsThe Alaska pipeline follows the Dalton Highway in the Brooks Range in this photo taken on August 15, 2012. The pipeline connects the oil fields at Prudhoe Bay with the tanker facilities in Valdez, a distance of over 800 miles. (Credit: Kevin Schaefer, NSIDC)
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59 viewsIn this photo taken on August 16, 2012, Tim Schaefer, Lin Liu, Alessio Gusmeroli, and Tingjun Zhang cook food and examine the day’s observations of active layer depth at camp just south of Deadhorse, Alaska. (Credit: Kevin Schaefer, NSIDC)
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59 viewsSmall ices lenses are common in permafrost, as seen in this typical permafrost core drilled near Deadhorse, Alaska on August 17, 2012. (Credit: Kevin Schaefer, NSIDC)
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59 viewsThe equipment required to drill permafrost cores consists of shovels and a tarp, a motor to power the drill, a cooler to keep the samples frozen, a toolbox, a steel pry bar, and an augur drill bit. (Credit: Kevin Schaefer, NSIDC)
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59 viewsLin Liu checks the day's data at basecamp. (Credit: Kevin Schaefer, NSIDC)
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permafrost, nsidc, kevin schaefer, alaska, barrow58 viewsKevin Schaefer walks along the road to a next survey site near Barrow Alaska on August 11, 2013. Contrary to what the sign says, the effective speed limit was actually 5 mph (Credit: Elchin Jafarov, NSIDC).
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