Sebastian Wetterich, Lutz Schirrmeiste, Larisa B. Nazarova, Olga Palagushkina, Anatoly Bobrov, Lilit Pogosyan, Larisa Savelieva, Liudmila Syrykh, Heidrun Matthes, Michael Fritz, Frank Günther, Thomas Opel, Hanno Meyer
- 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 surfaceGround 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.…
MetadatenAuthor details: | Sebastian WetterichORCiD, Lutz SchirrmeisteORCiD, Larisa B. NazarovaORCiD, Olga PalagushkinaORCiD, Anatoly BobrovORCiD, Lilit PogosyanORCiD, Larisa SavelievaORCiD, Liudmila SyrykhORCiD, Heidrun MatthesORCiD, Michael FritzORCiDGND, Frank GüntherORCiD, Thomas OpelORCiDGND, Hanno MeyerORCiDGND |
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DOI: | https://doi.org/10.1002/ppp.1979 |
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ISSN: | 1045-6740 |
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ISSN: | 1099-1530 |
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Title of parent work (English): | Permafrost and Periglacial Processes |
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Publisher: | Wiley |
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Place of publishing: | Hoboken |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2018/07/10 |
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Publication year: | 2018 |
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Release date: | 2021/11/12 |
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Tag: | Khalerchinskaya tundra; bioindicators; cryolithology; hydrochemistry; stable water isotopes |
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Volume: | 29 |
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Issue: | 3 |
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Number of pages: | 17 |
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First page: | 182 |
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Last Page: | 198 |
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Funding institution: | Bundesministerium fur Bildung und ForschungFederal Ministry of Education & Research (BMBF) [01DJ14003]; Deutsche ForschungsgemeinschaftGerman Research Foundation (DFG) [HE 3622/16-1]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [11-04-91332-NNIO-a]; Russian Science FoundationRussian Science Foundation (RSF) [16-17-10118]; Saint Petersburg State University [18.40.68.2017] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Peer review: | Referiert |
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Publishing method: | Open Access / Green Open-Access |
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