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88 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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88 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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86 viewsTingjun Zhang, Alessio Gusmeroli, Lin Liu, and Tim Schaefer check gear before starting a new survey of active layer depth using ground penetrating radar on August 16, 2012. Zhang holds the radar controller while the yellow antenna rests at his feet next to a spool of survey line. (Credit: Kevin Schaefer, NSIDC)
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82 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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86 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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81 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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85 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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87 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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93 viewsTingjun Zhang drags the antenna for the ground penetrating radar while Alessio Gusmeroli records the active layer depth readings on August 16, 2012. (Credit: Tingjun Zhang, NSIDC).
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88 viewsKevin Schaefer and Lin Liu photograph and wrap permafrost core samples on August 17, 2012 while Alessio Gusmeroli and Tim Schaefer drill more permafrost core samples. (Credit: Tingjun Zhang, NSIDC)
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87 viewsAlessio Gusmeroli models his new turf top hat after drilling a permafrost core near Deadhorse, Alaska on August 17, 2012). (Credit: Tingjun Zhang, NSIDC)
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88 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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