New Data on Variations of Stable Isotopes in the Pingo Ice Core in the Southern Part of the Tazovsky Peninsula

摘要

The aim of this work is to obtain the vertical isotopic profile of the thick Pestsovoe pingo ice core in the southern part of the Tazovsky Peninsula, to determine the oxygen and hydrogen isotopic composition of the ice, and to reveal its formation conditions. Two trends were identified for the isotopic profile of the pingo ice: an insignificant increase of the delta O-18 (similar to 1.5%) and delta D (similar to 9%) values at depths of 12-15 m and a gradual decrease of isotopic values by 3.8 and 23% for delta O-18 and delta D, respectively, at a depth of 15-26 m. The formation of the pingo ice core in the semiclosed system resulted in fractionation of the isotopic composition of oxygen and hydrogen by more than 4 and 20%, respectively.