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111 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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110 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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113 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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110 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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113 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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131 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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124 viewsLin Liu and Andy Persekian check active layer depth measurements on a laptop as Elchin Jafarov looks on. (Credit: Kevin Schaefer, NSIDC)
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112 viewsLin Liu pulls a ground penetrating radar unit through the tundra near Barrow, Alaska on 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: Kevin Schaefer, NSIDC)
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120 viewsLin Liu, Andy Parsekian, and Elchin Jafarov pull a ground penetrating radar unit through the tundra near Barrow, Alaska on August 10, 2013. The radar unit is in the box and the computer records the active layer depth (Credit: Kevin Schaefer, NSIDC).
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111 viewsTundra bugs are always curious about permafrost researchers. (Kevin Schaefer, NSIDC)
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121 viewsKevin Schaefer drains his mud boots after a day of sloshing through wet tundra. (Kevin Schaefer, NSIDC)
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112 viewsLin Liu and Andy Persekian take a dip during a break from data gathering. (Credit: Kevin Schaefer, NSIDC)
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