Expedition Lena-Delta August 2015

Polygonal tundra

Drained thermokarst lake basin (alas) on Sobo-Sise, Lena River Delta

Field camp on Sobo-Sise, living, kitchen and laboratory tents

Impressive ice-wedge ground-ice bodies constitute the 25 m high and more than kilometer long Yedoma cliff

Permafrost thaw at the cliff edge

Sunset with seagull

Jacob's-ladder with bumblebee

Forget-me-not (myosotis palustris)

Cottongrass (eriophorum)

Bouquet of tundra flowers

Ready to retrive and read-out thermokarst lake water data loggers on Sobo-Sise

Fixing damages caused by a careless polar fox

Field camp on Bykovsky

Sunset over Bykovsky field camp

Laser scanning campaign of alas-yedoma thermokarst relief while Watching weather fronts coming and going

Countless rainbows

View of coalesced alases surrounded by eroding yedoma uplands

Sampling of peat horizons for reconstruction of permafrost thaw history

Tundra walk with sledge, samples, shovel, and gas drill

Active layer measurements of seasonal thaw depth in hummocky terrain

Preparing the boat for thermokarst lake bathymetric survey on Bykovsky

Only a thin cover protects ground ice from thaw, Neelov Bay

A pingo on Bykovsky is being confronted by the rapidly eroding coast

Eroded material and drift wood accumulates at the foot of the coastal slope until the next storm with heavy swells

Expediton team on Bykovsky