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permafrost, nsidc, kevin schaefer, alaska, barrow105 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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105 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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105 viewsTundra bugs are always curious about permafrost researchers. (Kevin Schaefer, NSIDC)
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105 viewsLin Liu and Andy Persekian take a dip during a break from data gathering. (Credit: Kevin Schaefer, NSIDC)
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105 viewsAndy Parsekian sets up the ground penetrating radar equipment for a survey of active layer depth near Barrow, Alaska on August 13, 2013. (Credit: Lin Liu).
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104 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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104 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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104 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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104 viewsLin Liu pulls a ground penetrating radar unit through the tundra in rainy weather as Andy Persekian and Elchin Jafarov follow behind. 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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104 viewsSnowmobiles stand by at field camp during the 2013 Arctic Observing Network (Snownet) project in Alaska's North Slope.
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permafrost, nsidc, kevin schaefer, alaska, barrow103 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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permafrost, nsidc, kevin schaefer, alaska, barrow102 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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