Sediment, ground ice and micropaleontological data from the pingo exposure 'Shirokovsky Kholm' (Kolyma Lowland, NE Siberia) sampled in 2012 ...

• Main Authors: Wetterich, Sebastian, Meyer, Hanno, Nazarova, Larisa B, Palagushkina, Olga V, Savelieva, Larissa A, Schirrmeister, Lutz, Syrykh, Luidmila S
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2017
• Subjects: Permafrost Research AWI_Perma; Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn; Polar Terrestrial Environmental Systems @ AWI AWI_Envi; Ice; permafrost; Thermokarst; wedge*; Siberia
• Online Access: https://dx.doi.org/10.1594/pangaea.884369; https://doi.pangaea.de/10.1594/PANGAEA.884369

Ground ice and sedimentary records of a pingo exposure reveal insights into Holocene permafrost, landscape and climate dynamics. Early to mid‐Holocene thermokarst lake deposits contain rich floral and faunal paleoassemblages, which indicate lake shrinkage and decreasing summer temperatures (chironomid‐based TJuly) from 10.5 to 3.5 cal kyr BP with the warmest period between 10.5 and 8 cal kyr BP. Talik refreezing and pingo growth started about 3.5 cal kyr BP after disappearance of the lake. The isotopic composition of the pingo ice (δ18O − 17.1 ± 0.6‰, δD −144.5 ± 3.4‰, slope 5.85, deuterium excess −7.7± 1.5‰) point to the initial stage of closed‐system freezing captured in the record. A differing isotopic composition within the massive ice body was found (δ18O − 21.3 ± 1.4‰, δD −165 ± 11.5‰, slope 8.13, deuterium excess 4.9± 3.2‰), probably related to the infill of dilation cracks by surface water with quasi‐meteoric signature. Currently inactive syngenetic ice wedges formed in the thermokarst basin after ... : Supplement to: Wetterich, Sebastian; Schirrmeister, Lutz; Nazarova, Larisa B; Palagushkina, Olga V; Bobrov, Anatoly A; Pogosyan, Lilith; Savelieva, Larissa A; Syrykh, Luidmila S; Matthes, Heidrun; Fritz, Michael; Günther, Frank; Opel, Thomas; Meyer, Hanno (2018): Holocene thermokarst and pingo development in the Kolyma Lowland (NE Siberia). Permafrost and Periglacial Processes, 29(3), 182-198 ...