TY - JOUR

T1 - Holocene thermokarst and pingo development in the Kolyma Lowland (NE Siberia)

AU - Wetterich, Sebastian

AU - Schirrmeiste, Lutz

AU - Nazarova, Larisa

AU - Palagushkina, Olga

AU - Bobrov, Anatoly

AU - Pogosyan, Lilit

AU - Savelieva, Larisa

AU - Syrykh, Liudmila

AU - Matthes, Heidrun

AU - Fritz, Michael

AU - Guenther, Frank

AU - Opel, Thomas

AU - Meyer, Hanno

PY - 2018/7/1

Y1 - 2018/7/1

N2 - 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 T-July) 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 (delta O-18 - 17.1 +/- 0.6 parts per thousand, delta D -144.5 +/- 3.4 parts per thousand, slope 5.85, deuterium excess -7.7 +/- 1.5 parts per thousand) point to the initial stage of closed-system freezing captured in the record. A differing isotopic composition within the massive ice body was found (delta O-18 - 21.3 +/- 1.4 parts per thousand, delta D -165 +/- 11.5 parts per thousand, slope 8.13, deuterium excess 4.9 +/- 3.2 parts per thousand), 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.

AB - 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 T-July) 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 (delta O-18 - 17.1 +/- 0.6 parts per thousand, delta D -144.5 +/- 3.4 parts per thousand, slope 5.85, deuterium excess -7.7 +/- 1.5 parts per thousand) point to the initial stage of closed-system freezing captured in the record. A differing isotopic composition within the massive ice body was found (delta O-18 - 21.3 +/- 1.4 parts per thousand, delta D -165 +/- 11.5 parts per thousand, slope 8.13, deuterium excess 4.9 +/- 3.2 parts per thousand), 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.

KW - bioindicators

KW - cryolithology

KW - hydrochemistry

KW - Khalerchinskaya tundra

KW - stable water isotopes

KW - NORTHERN SEWARD PENINSULA

KW - WESTERN ARCTIC COAST

KW - DMITRY LAPTEV STRAIT

KW - LATE QUATERNARY

KW - STABLE-ISOTOPES

KW - GROUND-ICE

KW - LENA DELTA

KW - DATA SET

KW - PERMAFROST

KW - ALASKA

UR - http://www.scopus.com/inward/record.url?scp=85050799249&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/holocene-thermokarst-pingo-development-kolyma-lowland-ne-siberia

U2 - 10.1002/ppp.1979

DO - 10.1002/ppp.1979

M3 - статья

VL - 29

SP - 182

EP - 198

JO - Permafrost and Periglacial Processes

JF - Permafrost and Periglacial Processes

SN - 1045-6740

IS - 3

ER -