DOI: 10.1016/j.epsl.2020.116650
论文题名: Northwest Pacific ice-rafted debris at 38°N reveals episodic ice-sheet change in late Quaternary Northeast Siberia
作者: McCarron A.P. ; Bigg G.R. ; Brooks H. ; Leng M.J. ; Marshall J.D. ; Ponomareva V. ; Portnyagin M. ; Reimer P.J. ; Rogerson M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 553 语种: 英语
中文关键词: ice-rafted debris
; ice-sheet
; Northwest Pacific
; ODP site 1207A
英文关键词: Debris
; Glaciers
; Isotopes
; Offshore oil well production
; Sea ice
; Uncertainty analysis
; Last glacial period
; Laurentide ice sheets
; Marine isotope stages
; North-East Siberia
; Potential sources
; Radiocarbon dates
; Subtropical water
; Transition regions
; Glacial geology
; climate variation
; Heinrich event
; ice cover
; ice sheet
; ice-rafted debris
; Laurentide Ice Sheet
; marine isotope stage
; Ocean Drilling Program
; paleoclimate
; Quaternary
; radiocarbon dating
; tephrochronology
; Pacific Ocean
; Pacific Ocean (Northwest)
; Siberia
英文摘要: The ice-rafted-debris (IRD) record of the open Northwest Pacific points towards the existence of substantial glacial ice on the Northeast Siberian coast during the late Quaternary. However, the scale and timing of glaciation and de-glaciation remains controversial due to the dearth of both onshore and offshore records. Existing IRD data suggests at least one event of dynamic and abrupt change during mid-late Marine Isotope Stage (MIS 3) which mimics the massive collapse of the Laurentide ice sheet during Heinrich Events. It is uncertain whether other events of this magnitude occurred during the late Quaternary. Here we present a ∼160,000 yr IRD series, planktic foraminiferal counts and an age model, derived from a benthic δ18O curve, radiocarbon dates and tephrochronology, from core ODP 1207A (37.79°N, 162.75°E), revealing the presence of low but episodic flux of IRD. We conclude that glacial Northwest Pacific icebergs spread further south than previously thought, with icebergs emanating from Northeast Siberia being transported to the transition region between the subpolar and subtropical waters, south of the subarctic front during at least the Quaternary's last two glacial periods. The episodic nature of the 1207A IRD record during the last glacial, combined with coupled climate-iceberg modelling, suggests occasional times of much enhanced ice flux from the Kamchatka-Koryak coast, with other potential sources on the Sea of Okhotsk coast. These findings support the hypothesis of a variable but extensive ice mass during the last glacial over Northeast Siberia, particularly early in the last glacial period, behaving independently of North American and Eurasian ice masses. In strong contrast, IRD was absent during much of the penultimate glacial Marine Isotope Stage (MIS) 6 suggesting the possibility of very different Northeast Siberian ice coverage between the last two glacial periods. © 2020 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165595
Appears in Collections: 气候变化与战略
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作者单位: Department of Geography, University of Sheffield, Sheffield, United Kingdom; British Geological Survey, Keyworth, United Kingdom; School of Biosciences, University of Nottingham, Nottingham, United Kingdom; School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom; Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky, Russian Federation; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Vernadsky Institute of Geochemistry and Analytical Chemistry, Moscow, Russian Federation; School of Natural and Built Environment, Queen's University Belfast, Belfast, United Kingdom; Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, United Kingdom
Recommended Citation:
McCarron A.P.,Bigg G.R.,Brooks H.,et al. Northwest Pacific ice-rafted debris at 38°N reveals episodic ice-sheet change in late Quaternary Northeast Siberia[J]. Earth and Planetary Science Letters,2021-01-01,553