@article{7f1dc2cc9e6546ad99f272eab6992c0e,
title = "Ice Complex formation on Bol'shoy Lyakhovsky Island (New Siberian Archipelago, East Siberian Arctic) since about 200 ka",
abstract = "Late Quaternary landscapes of unglaciated Beringia were largely shaped by ice-wedge polygon tundra. Ice Complex (IC) strata preserve such ancient polygon formations. Here we report on the Yukagir IC from Bol'shoy Lyakhovsky Island in northeastern Siberia and suggest that new radioisotope disequilibria (230Th/U) dates of the Yukagir IC peat confirm its formation during the Marine Oxygen Isotope Stage (MIS) 7a-c interglacial period. The preservation of the ice-rich Yukagir IC proves its resilience to last interglacial and late glacial-Holocene warming. This study compares the Yukagir IC to IC strata of MIS 5, MIS 3, and MIS 2 ages exposed on Bol'shoy Lyakhovsky Island. Besides high intrasedimental ice content and syngenetic ice wedges intersecting silts, sandy silts, the Yukagir IC is characterized by high organic matter (OM) accumulation and low OM decomposition of a distinctive Drepanocladus moss-peat. The Yukagir IC pollen data reveal grass-shrub-moss tundra indicating rather wet summer conditions similar to modern ones. The stable isotope composition of Yukagir IC wedge ice is similar to those of the MIS 5 and MIS 3 ICs pointing to similar atmospheric moisture generation and transport patterns in winter. IC data from glacial and interglacial periods provide insights into permafrost and climate dynamics since about 200 ka.",
keywords = "Beringia, Cryostratigraphy, Ice wedges, Pollen, Radioisotope disequilibria dating, Stable isotopes",
author = "Sebastian Wetterich and Natalia Rudaya and Vladislav Kuznetsov and Fedor Maksimov and Thomas Opel and Hanno Meyer and Frank G{\"u}nther and Anatoly Bobrov and Elena Raschke and Zimmermann, {Heike H.} and Jens Strauss and Anna Starikova and Margret Fuchs and Lutz Schirrmeister",
note = "Funding Information: The German Federal Ministry of Education and Research (BMBF) supported the study that contributes to the BMBF projects CARBOPERM (grant no. 03G0836) and Arc-EcoNet (grant no. 01DJ14003 to SW). Further support was provided by the Deutsche Forschungsgemeinschaft (grant nos. OP217/3-1 to TO and WE4390/7-1 to SW), by the Russian Foundation for Basic Research (grant no. 15-29-02518 to AB), by the St. Petersburg State University (grant no. 18.40.68.2017 to VK and FM), by the President of the Russian Federation (grant no. MK-1428.2017.5 to AS), and by the Alexander von Humboldt Foundation (grant no. Ref 3.3-RUS-1151158-HFST-E to NR). We acknowledge support by the German Academic Exchange Service (DAAD) with funds from the BMBF and the European Union's Seventh Framework Programme (FP7, grant agreement #605728). The pollen study was performed according to the Russian Government Program of Competitive Growth of the Kazan Federal University. We acknowledge the support by the European Research Council (Starting Grant #338335) and the Initiative and Networking Fund of the Helmholtz Association (#ERC-0013). We thank our colleagues during fieldwork in 2007 and 2014, especially Vladimir Tumskoy and Dmitry Dobrynin (Moscow State University), Dmitry Mel'nichenko (Hydrobase Tiksi), and Georg Schwamborn and Waldemar Schneider (AWI Potsdam). Publisher Copyright: Copyright {\textcopyright} 2019 University of Washington. Published by Cambridge University Press.",
year = "2019",
month = sep,
day = "1",
doi = "10.1017/qua.2019.6",
language = "English",
volume = "92",
pages = "530--548",
journal = "Quaternary Research",
issn = "0033-5894",
publisher = "Cambridge University Press",
number = "2",
}
