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Holocene thermokarst and pingo development in the Kolyma Lowland (NE Siberia)

Author

Listed:
  • Sebastian Wetterich
  • Lutz Schirrmeister
  • Larisa Nazarova
  • Olga Palagushkina
  • Anatoly Bobrov
  • Lilit Pogosyan
  • Larisa Savelieva
  • Liudmila Syrykh
  • Heidrun Matthes
  • Michael Fritz
  • Frank Günther
  • Thomas Opel
  • Hanno Meyer

Abstract

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 lake drainage. The pingo preserves traces of permafrost response to climate variations in terms of ground‐ice degradation (thermokarst) during the early and mid‐Holocene, and aggradation (wedge‐ice and pingo‐ice growth) during the late Holocene.

Suggested Citation

  • Sebastian Wetterich & Lutz Schirrmeister & Larisa Nazarova & Olga Palagushkina & Anatoly Bobrov & Lilit Pogosyan & Larisa Savelieva & Liudmila Syrykh & Heidrun Matthes & Michael Fritz & Frank Günther , 2018. "Holocene thermokarst and pingo development in the Kolyma Lowland (NE Siberia)," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 29(3), pages 182-198, July.
    • Handle: RePEc:wly:perpro:v:29:y:2018:i:3:p:182-198
    DOI: 10.1002/ppp.1979
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    Cited by:

    1. Vasiliy Demidov & Sebastian Wetterich & Nikita Demidov & Lutz Schirrmeister & Sergey Verkulich & Andrey Koshurnikov & Vladimir Gagarin & Aleksey Ekaykin & Anton Terekchov & Arina Veres & Anna Kozachek, 2021. "Pingo drilling reveals sodium–chloride‐dominated massive ice in Grøndalen, Spitsbergen," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 32(4), pages 572-586, October.

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