Isotope-geochemical composition of ice wedges in the slope yedoma on the Kular Ridge and reconstruction of the mean January air paleotemperature during 47,000-25,000 BP@en

The isotope composition and hydrochemical properties of the Late Pleistocene ice wedges in the outcrop of flat side of Kular Ridge located in the western part of Yana-Indigirka Lowland have been analyzed. It has been established that variations of the δ¹⁸О values in the ice wedges (varying -32.6 ‰ to -31.0 ‰) do not exceed 1.6 ‰. The mean winter and mean January temperature reconstructions have been carried out by means of the palaeogeocryologyical studies of the oxygen stable isotopes contained in ice wedges. In the Kular Ridge area, the mean January air temperature in Late Pleistocene was by 7 °C lower than the current. Besides, the lowest mean winter temperature was referred to the 37-32 ka BP.对位于亚纳-因迪吉尔卡低地（Yana-Indigirka Lowland）西部的库拉尔岭（Kular Ridge）平缓侧翼露头中的晚更新世（Late Pleistocene）冰楔（ice wedges）的同位素组成与水化学特征进行了分析。研究表明，冰楔内的δ¹⁸O值变化范围为-32.6‰至-31.0‰，波动幅度不超过1.6‰。通过对冰楔中赋存的稳定氧同位素开展古冻土学（palaeogeocryologyical）研究，完成了研究区冬季平均气温与1月平均气温的重建。库拉尔岭区域晚更新世的1月平均气温较现今偏低7℃。此外，最低冬季平均气温出现在距今3.7万至3.2万年前（37-32 ka BP）。