The Oxygen Isotope Composition of Late Pleistocene and Holocene Ice Wedges of Kotelny Island     

Vasil’chuk  Yu. K.  Makeev  V. M.  Maslakov  A. A.  Budantseva  N. A.  Vasil’chuk  A. C.  Chizhova  Ju. N. 《Doklady Earth Sciences》2018,482(1):1216-1220

The aim of the work was to perform paleotemperature reconstructions for the Late Pleistocene and Holocene of Kotelny Island according to oxygen isotope analysis of syngenetic ice wedges. Variations of δ¹⁸O in the Late Pleistocene ice wedges formed on Kotelny Island are significant, exceeding 8‰ (from –30‰ to –22.9‰), while they are insignificant at –1.5‰ (from –23.1‰ to –21.6‰) for those in the Holocene. Reconstructions showed that the mean January temperature in the Late Pleistocene changed over 8 to 13°C. The mean annual temperature of frozen soils was about –19 or –20°C in the Late Pleistocene, and about –13 to –15°C in the Holocene, while the current temperature is about –14°C.

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Oxygen Isotope Composition of Holocene Ice Wedges of Eastern Chukotka     

Yu. K. Vasil’chuk  N. A. Budantseva  A. C. Vasil’chuk  A. A. Maslakov  Ju. N. Chizhova 《Doklady Earth Sciences》2018,480(2):758-762

The isotope-oxygen composition of ice wedges, ground ice, ice of the intrusive-segregated seasonal mound, and segregated ice of Eastern Chukotka near Koolen Lake, the settlement of Lavrentiya on the Chul’kheveem River, the settlement of Lorino, and the city of Anadyr on the Onemen Bay coast was studied. The comparison of isotopic diagrams showed that the variations in δ¹⁸O of the Holocene ice wedges of Eastern Chukotka did not exceed 2‰, which indicates the insignificant variability of climatic winter conditions in the late Holocene. The long-term mean-January temperature values varied less than 3°C according to calculations from the equations of interrelation between air temperature and the isotopic composition of the wedges.  相似文献