Ground-ice stable isotopes and cryostratigraphy reflect late Quaternary palaeoclimate in the Northeast Siberian Arctic (Oyogos Yar coast, Dmitry Laptev Strait)

被引：37

作者：

Opel, Thomas ^{[1
,4
]}

Wetterich, Sebastian ^{[1
]}

Meyer, Hanno ^{[1
]}

Dereviagin, Alexander Y. ^{[2
]}

Fuchs, Margret C. ^{[3
]}

Schirrmeister, Lutz ^{[1
]}

机构：

[1] Alfred Wegener Inst, Helmholtz Ctr Polar & Marine Res, Periglacial Res Sect, D-14473 Potsdam, Germany

[2] Lomonosov Moscow State Univ, Geol Dept, Moscow 119992, Russia

[3] Helmholtz Zentrum Dresden Rossendorf, Helmholtz Inst Freiberg Resource Technol, D-09599 Freiberg, Germany

[4] Univ Sussex, Permafrost Lab, Dept Geog, Brighton BN1 9RH, E Sussex, England

来源：

CLIMATE OF THE PAST | 2017年 / 13卷 / 06期

关键词：

BOLSHOY LYAKHOVSKY ISLAND; PALEOENVIRONMENTAL HISTORY; EASTERN BERINGIA; SEA REGION; PERMAFROST; WEDGES; OXYGEN; PLEISTOCENE; HYDROGEN; SINGLE;

D O I：

10.5194/cp-13-587-2017

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

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 (112.5 +/- 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. Groundice 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-wedgebased 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.

引用

页码：587 / 611

页数：25