Stable water isotope data from segregation ice of the Bol'shoy Lyakhovsky Island 1999

• Main Authors: Meyer, Hanno, Schirrmeister, Lutz
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: AWI_Envi; AWI_PerDyn; AWI_Perma; AWI Arctic Land Expedition; Bolshoy Lyakhovsky Island; East Siberia; Russia; Conductivity; electrolytic; Deuterium excess; ELEVATION; Event label; HAND; LAND; Latitude of event; Longitude of event; Lya_1999; Lya_1999_1TZ; Lya_1999_2TZ; Lya_1999_3TZ; Lya_1999_B15; Lya_1999_L11; Lya_1999_L3; Lya_1999_R14+40; Lya_1999_R17; Lya_1999_R17+30; Lya_1999_R18+50; Lya_1999_R22+60; Lya_1999_R33-A; Lya_1999_R8+50; Lya_1999_R9+85; Lyakhovsky Islands; MULT; Multiple investigations; Number; Permafrost Research; Permafrost Research (Periglacial Dynamics) @ AWI; pH; Polar Terrestrial Environmental Systems @ AWI; RU-Land_1999_Lyakhovsky; Sample code/label; Sampling/measurement on land; Sampling by hand; section R; west of Zymove mouth; δ18O; standard deviation; standard error; Arctic; New Siberian Islands; Berichte zur Polarforschung; Ice; permafrost; Permafrost and Periglacial Processes; Polar Research; Polarforschung; Reports on polar research; wedge*; Siberia
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.883615; https://doi.org/10.1594/PANGAEA.883615

Late Quaternary permafrost deposits on Big Lyakhovsky Island (New Siberian Islands, Russian Arctic) were studied with the aim of reconstructing the palaeoclimatic and palaeoenvironmental conditions of northern Siberia. Hydrogen and oxygen stable isotope analyses are presented for six different generations of ice wedges as well as for recent ice wedges and precipitation. An age of about 200 ka BP was determined for an autochtonous peat layer in ice-rich deposits by U/Th method, containing the oldest ice wedges ever analysed for hydrogen and oxygen isotopes. The palaeoclimatic reconstruction revealed a period of severe winter temperatures at that time. After a gap in the sedimentation history of several tens of thousands of years, ice-wedge growth was re-initiated around 50 ka BP by a short period of extremely cold winters and rapid sedimentation leading to ice-wedge burial and characteristic ice-soil wedges ('polosatics'). This corresponds to the initial stage for the Late Weichselian Ice Complex, a peculiar cryolithogenic periglacial formation typical of the lowlands of northern Siberia. The Ice Complex ice wedges reflect cold winters and similar climatic conditions as around 200 ka BP. With a sharp rise in d18O of 6 per mil and dD of 40 per mil, the warming trend between Pleistocene and Holocene ice wedges is documented. Stable isotope data of recent ice wedges show that Big Lyakhovsky Island has never been as warm in winter as today.