Opel_2017_CP_Published version.pdf (2.96 MB)
Ground-ice stable isotopes and cryostratigraphy reflect late Quaternary palaeoclimate in the Northeast Siberian Arctic (Oyogos Yar coast, Dmitry Laptev Strait)
journal contribution
posted on 2023-06-09, 06:54 authored by Thomas Opel, Sebastian Wetterich, Hanno Meyer, Alexander Yu Dereviagin, Margret C Fuchs, Lutz SchirrmeisterTo reconstruct palaeoclimate and palaeoenvironmental conditions in the northeast Siberian Arctic, we studied late Quaternary permafrost at the Oyogos Yar coast (Dmitry Laptev Strait). New infrared-stimulated luminescence ages for distinctive floodplain deposits of the Kuchchugui Suite (112.5?±?9.6?kyr) and thermokarst-lake deposits of the Krest Yuryakh Suite (102.4?±?9.7?kyr), respectively, provide new substantial geochronological data and shed light on the landscape history of the Dmitry Laptev Strait region during Marine Isotope Stage (MIS) 5. Ground-ice stable-isotope data are presented together with cryolithological information for eight cryostratigraphic units and are complemented by data from nearby Bol'shoy Lyakhovsky Island. Our combined record of ice-wedge stable isotopes as a proxy for past winter climate conditions covers about 200?000 years and is supplemented by stable isotopes of pore and segregated ice which reflect annual climate conditions overprinted by freezing processes. Our ice-wedge stable-isotope data indicate substantial variations in northeast Siberian Arctic winter climate conditions during the late Quaternary, in particular between glacial and interglacial times but also over the last millennia to centuries. Stable isotope values of ice complex ice wedges indicate cold to very cold winter temperatures about 200?kyr ago (MIS7), very cold winter conditions about 100?kyr ago (MIS5), very cold to moderate winter conditions between about 60 and 30?kyr ago, and extremely cold winter temperatures during the Last Glacial Maximum (MIS2). Much warmer winter conditions are reflected by extensive thermokarst development during MIS5c and by Holocene ice-wedge stable isotopes. Modern ice-wedge stable isotopes are most enriched and testify to the recent winter warming in the Arctic. Hence, ice-wedge-based reconstructions of changes in winter climate conditions add substantial information to those derived from paleoecological proxies stored in permafrost and allow a distinction between seasonal trends of past climate dynamics. Future progress in ice-wedge dating and an improved temporal resolution of ice-wedge-derived climate information may help to fully explore the palaeoclimatic potential of ice wedges.
History
Publication status
- Published
File Version
- Published version
Journal
Climate of the PastISSN
1814-9324Publisher
Copernicus PublicationsExternal DOI
Volume
13Page range
587-611Department affiliated with
- Geography Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2017-06-26First Open Access (FOA) Date
2017-06-26First Compliant Deposit (FCD) Date
2017-06-26Usage metrics
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