CONTENT AND VARIATIONS OF STABLE CARBON AND NITROGEN ISOTOPES IN THE POLYGONAL PEAT BOGS NEAR THE VILLAGE OF NOVY PORT, YAMAL PENINSULA

The authors studied polygonal peat bogs on the first and second lagoon-marine terraces in shrub tundra near the village of Novy Port in the south-east of the Yamal Peninsula. They determined the radiocarbon age of the peat, the contents of organic carbon and nitrogen, as well as the isotopic composition of these elements in the peat. The chronology of the peat bogs formation was established: their growth occurred between 8,840 and 7,050 cal BP on the second terrace, and between 9,820 and 7,670 cal BP on the first. According to 14C dates, the rate of peat accumulation ranged from 0.6 to 1.9 millimeters per year. Global cooling that occurred 8.2 ka BP was mainly expressed in a decrease in nitrogen mineralization due to lower temperatures in winter and during the transitional seasons, but it was not recorded in the summer season in the southern part of the Yamal Peninsula. The boundary between the Greenland and Northgrippian periods is located at a depth between 0.4 and 0.50 meters in peat on the second terrace and between 0.7 and 0.8 meters on the first. The absence of a transition layer indicates maximum peat thaw due to global warming.

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