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NSIDC director poses at the sign marking the Arctic Circle along the Dalton Highway in Alaska, during the 2011 Arctic Observing Network project. (View photo detail.)
Snowmobiles head north along the Dalton Highway towards the North Slope, for the 2011 Arctic Observing Network field season. (View photo detail.)
The sun sets over field camp during the 2011 Arctic Observing Network (Snownet) fieldwork. (View photo detail.)
The Alaska Pipeline transports oil 800 miles from the North Slope to Valdez, Alaska. (View photo detail.)
Mark Serreze (left) and Matthew Sturm collect data on snow cover during the 2011 Arctic Observing Network (Snownet) project. (View photo detail.)
Mark Serreze measures snow depth during the 2011 Arctic Observing Network (Snownet) project (View photo detail.)
Mark Serreze poses on the Arctic tundra, during the 2011 Arctic Observing Network (Snownet) project (View photo detail.)
NSIDC researcher Andrew Slater prepares to travel by snowmobile during the 2011 Arctic Observing Network (Snownet) project. (View photo detail.)
Researchers consult their notes during the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
Mark Serreze consults plans during the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
Mark Parsons sets up a weather station during the the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
Researchers set up research equipment during the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
Researchers Matthew Sturm (left) and Mark Serreze examine layers in a snow pit during the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
Mark Parsons digs a snow pit to examine the properties of snow cover during the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
Mark Parsons sets up research equipment during the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
Mark Serreze measures snow depth during the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
Andrew Slater poses with a snowmobile during the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
An Arctic researcher and his snowmobile during the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
Mark Serreze measures snow depthduring the 2011 Arctic Observing Network (Snownet) project in Alaska. (View photo detail.)
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