In situ measurements of freeze/thaw ground displacement in the Lena River Delta, 2013-2017, using steel pipes ...

• Main Authors: Antonova, Sofia, Sudhaus, Henriette, Strozzi, Tazio, Zwieback, Simon, Kääb, Andreas, Heim, Birgit, Langer, Moritz, Bornemann, Niko, Boike, Julia
• Format: Dataset
• Language: English
• Published: PANGAEA 2018
• Subjects: Event label; Station label; DATE/TIME; DISTANCE; Sampling/measurement on land; Permafrost Research AWI_Perma; Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn; Polar Terrestrial Environmental Systems @ AWI AWI_Envi; Ice; lena river; permafrost
• Online Access: https://dx.doi.org/10.1594/pangaea.894715; https://doi.pangaea.de/10.1594/PANGAEA.894715

In permafrost areas, seasonal freeze-thaw cycles of active layer result in upward and downward movements of the ground. Additionally, relatively uniform thawing of the ice-rich layer at the permafrost table can contribute to net long-term surface lowering. We use a simple method to quantify surface lowering (subsidence) and uplift in a yedoma area of the Lena River Delta, Siberian Arctic (Kurungnakh Island), using reference rods (metal pipes and fiberglass rods) installed deeply in permafrost. The metal pipes were 2 m long and 3 cm in diameter and were anchored at least 1 m below the typical active layer. The fiberglass rods were 2 m long and 1 cm in diameter and were anchored at least 70 m below the typical active layer. We assume, therefore, that the rods were motionless relative to the permafrost. The plexiglass plate with a size of 10 by 10 cm was fixed in its horizontal position by the rod but could move freely with the surface vertically along the rod. We repeatedly measured distance between the top of ... : Measurements are the distances between the ground surface and the top of the metal pipe, in cm. To obtain the displacement, you need to subtract the measurement on a certain date from the reference measurement (e.g. from the very first one). ...