Jens observing a Yedoma outcrop on the Baldwin Peninsula

Frozen organic matter in a permafrost core

Validation flight over Kobuk river valley

Sunset at Kotzebue, Alaska

Sunset at Kotzebue, Alaska

Ingmar on his way to the next permafrost coring location carriyng gear for the SIPRE corer

Exposed Holocene ice wedge at the shore of the Arctic Ocean

Aerial view of the city of Kotzebue, Arctic Alaska

Rainbow over the the Arctic tundra

Old 'Welcome to Kotzebue' sign, Kotzebue, Alaska

Jens sampling and describing a Yedoma outcrop

The Kobuk sand dunes - impressive features in the Kobuk Valley National Park

Matthias and Guido sampling permafrost cores in the Kobuk Delta

Jens describing a permafrost exposure on the Baldwin Peninsula while Bill from the U.S. Fish and Wildlife Service is taken care of the bear safety

Ben Jones and Josefine coring permafrost with the SIPRE corer in the Noatak Delta

Being around 12 years old, the Selawik Slump is already stabilized and vegetated

The about 300 year old GG basin on the Northern Seward Peninsula drained in Spring 2005 (see Lenz et al. 2016a)

It will be midnight soon when Guido and his team is finishing their field work for the day

Guido and Josefine are proud of a short lake sediment core from about 70 m water depth

Ingmar helping Josefine to sample lake sediments from the floats of the float plane

Happy scientist in the field!

Team PETA-CARB at the last bridge in Last Bridge

Unconventional and successful lake coring in waiders on the central Seward Peninsula

Last day of field work and last rest at Kougarok Road on the central Seward Peninsula

Stopover in the Kobuk sand dunes during a validation flight in the Kobuk river region

Josefine, Jim Webster and Ben Jones installing the lake sediment coring platform in the Kobuk river delta

Josefine, Jens, Ingmar and Matthias walking through the tundra