Last preparations for the flight from Deadhorse to Teshekpuk lake

Polygonal patterned ground in the Fish Creek river delta

Burned, “drunken forest” with smoke at Yukon River Crossing on the Dalton Highway

Preparation of the expedition equipment for the transport from Fairbanks to Deadhorse

Teshekpuk Lake Observatory including camp ground for researchers

Guido and Ben Jones discussing the origin of an ice wedge at the shore of Teshekpuk lake

Carson Baughman and Guido drilling a permafrost core in the Ikpikpuk river delta

Small peaty and sandy layers in a permafrost core from the Ikpikpuk river delta

Guido and Matthias returning to the floatplane after a successful field day

Drive north on the Dalton Highway from Fairbanks to Deadhorse with a white suburban

Jim´s floatplane shortly after the start above the Teshekpuk Lake Observatory

Campground in the morning fog

Narrow natural dam between two lakes on different elevation levels (ca. 10 m)

Matthias and Ingmar on the return flight from Teshekpuk to Deadhorse

Group picture in front of Jim´s plane. Guido Grosse, Carson Baughman, Ben Jones, Matthias Fuchs, Ingmar Nitze, Frank Günther, Jim Webster (from left to the right)

Pilot Jim Webster

Preparation for bathymetry measurements on an eroding shore of a thermokarst lake

Frank setting-up the „multi station“ for the next measurement

Colorful contrast: A field of pink fireweed in the Brooks Range along the Dalton Highway

Guido and the side effect of a warm and calm day in swampy drained thermokarst lake basins

Logistics in the tundra: Ingmar transporting food-toads on a rickshaw at Inigok field-station

Glowing Mountain: Dramatic sunset illuminating the hilltops of the Brooks Range south-west of Toolik Field Station

Soil profile of the active layer in a drained thaw lake basin

View of Finger Rock, one of the many natural sights along the Dalton Highway

Permafrost core from the Teshekpuk area