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

Holocene thermokarst and pingo development in the Kolyma Lowland (NE Siberia)
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科雷马低地(西伯利亚东北部)的全新世热岩溶和 pingo 发育

DOI:
10.1002/ppp.1979
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发表时间:
2018
影响因子:
5
通讯作者:
Opel T
Opel T
中科院分区:
地球科学3区
文献类型:
--
作者:
Wetterich S;Schirrmeister L;Nazarova L;Palagushkina O;Bobrov A;Pogosyan L;Savelieva L;Syrykh L;Matthes H;Fritz M;Gunther F;Opel T

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地面冰和沉积记录的冰丘暴露揭示了全新世冻土,景观和气候动态的见解。早至中全新世热岩溶湖泊沉积物包含丰富的植物和动物古组合,这表明湖泊收缩和夏季温度下降(摇蚊为基础的TJuly)从10.5到3.5 cal kyr BP,最温暖的时期在10.5到8 cal kyr BP之间。在湖泊消失后,约3.5卡尔·凯尔BP,湖泊重新冻结和冰沟生长开始。冰丘冰的同位素组成(δ 18 O − 17.1 ± 0.6‰,δD −144.5 ± 3.4‰,斜率5.85,氘过量−7.7± 1.5‰)表明记录中记录的封闭系统冻结的初始阶段。在巨大的冰体内发现了不同的同位素组成(δ 18 O − 21.3 ± 1.4‰,δD −165 ± 11.5‰,斜率8.13,氘过量4.9± 3.2‰),这可能与具有准大气特征的地表水填充膨胀裂缝有关。目前不活跃的同生冰楔形成于湖泊排泄后的热岩溶盆地。冰丘保存了多年冻土对气候变化的反应痕迹,包括全新世早期和中期的地冰退化(热岩溶)以及全新世晚期的加积(楔形冰和冰丘冰生长)。
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‐basedTJuly) 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.
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