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88 viewsResearch volunteer Tim Schaefer, Standford University scientist Lin Liu, and NSIDC senior research scientist Tingjun Zhang drill a permafrost sample south of Deadhorse, Alaska on July 10, 2009. The head nets protect the researchers from the clouds of mosquitoes that continually swarmed around them. (Credit: Kevin Schaefer, NSIDC)
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88 viewsStandford University scientist Lin Liu, NSIDC senior research scientist Tingjun Zhang, and research volunteer Tim Schaefer pull the auger bit containing a permafrost core out of a newly drilled hole near Deadhorse, Alaska on July 10, 2009. (Credit: Kevin Schaefer, NSIDC)
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88 viewsThis picture taken on July 13, 2009 shows a typical borehole after collecting a permafrost core sample. The ice and soil shavings that result from the auger bit used to drill the core sample have a look and consistency of wet concrete (Credit: Kevin Schaefer, NSIDC).
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88 viewsOn the 2009 trip to drill permafrost samples, the researchers’ truck was so loaded with equipment that retrieving anything required a headlong dive into the back. Here, Standford University scientist Lin Liu dives into the truck to retrieve his toothbrush in the morning. (Credit: Kevin Schaefer, NSIDC)
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87 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 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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87 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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86 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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86 viewsLin Liu checks the day's data at basecamp. (Credit: Kevin Schaefer, NSIDC)
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86 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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86 viewsA researcher's winter gloves provide a sense of scale to sastrugi, sharp irregular grooves or ridges formed on a snow surface by wind erosion, seen during the 2013 Arctic Observing Network (Snownet) project.
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85 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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