DOI: 10.5194/cp-13-587-2017
Scopus记录号: 2-s2.0-85015979713
论文题名: Ground-ice stable isotopes and cryostratigraphy reflect late Quaternary palaeoclimate in the Northeast Siberian Arctic (Oyogos Yar coast, Dmitry Laptev Strait)
作者: Opel T. ; Wetterich S. ; Meyer H. ; Dereviagin Y.A. ; Fuchs C.M. ; Schirrmeister L.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2017
卷: 13, 期: 6 起始页码: 587
结束页码: 611
语种: 英语
英文摘要: To 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 (112.5ĝ€±ĝ€9.6ĝ€kyr) and thermokarst-lake deposits of the Krest Yuryakh Suite (102.4ĝ€±ĝ€9.7ĝ€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 200ĝ€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 200ĝ€kyr ago (MIS7), very cold winter conditions about 100ĝ€kyr ago (MIS5), very cold to moderate winter conditions between about 60 and 30ĝ€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. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48916
Appears in Collections: 气候变化与战略
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Recommended Citation:
Opel T.,Wetterich S.,Meyer H.,et al. Ground-ice stable isotopes and cryostratigraphy reflect late Quaternary palaeoclimate in the Northeast Siberian Arctic (Oyogos Yar coast, Dmitry Laptev Strait)[J]. Climate of the Past,2017-01-01,13(6)