DOI: 10.1016/j.quascirev.2013.05.001
Scopus记录号: 2-s2.0-84885950691
论文题名: Geochemical and isotopic tracers of Arctic sea ice sources and export with special attention to the Younger Dryas interval
作者: Hillaire-Marcel C. ; Maccali J. ; Not C. ; Poirier A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 79 起始页码: 184
结束页码: 190
语种: 英语
英文关键词: Arctic
; Isotopes
; Meltwater
; Sea-ice
; Younger Dryas
Scopus关键词: Arctic
; Ice rafted debris
; Last Glacial Maximum
; Lomonosov ridges
; Meltwater
; Model experiments
; Radiogenic isotopes
; Younger Dryas
; Isotopes
; Sea ice
; Strontium
; Glacial geology
; geochemistry
; ice flow
; ice sheet
; ice-rafted debris
; isotopic analysis
; Last Glacial Maximum
; meltwater
; paleoceanography
; sea ice
; tracer
; Younger Dryas
; Arctic
; Arctic Ocean
; Fram Strait
; Lomonosov Ridge
英文摘要: Radiogenic isotopes (Sr, Nd) in Ice Rafted Debris (IRD) sediments from the Lomonosov Ridge and Fram Strait Arctic areas are used to document changes in Arctic sea-ice sources and trajectories since the Last Glacial Maximum (LGM). The two records provide evidence for enhanced sea-ice production in the Beaufort Sea and its subsequent export through Fram Strait during the Younger Dryas (YD) interval. This pattern, exclusive to the YD, followed an LGM-Bølling-Allerød interval, when multiyear and/or reduced sea-ice mobility resulted in sedimentary hiatuses in the Central Arctic. Meanwhile, IRD from Svalbard-Barents ice-sheet margin source were still deposited in the Fram Strait area. The "isotopic excursion" of the YD points to enhanced sea-ice production in the Beaufort Sea, which we link to the Lake Agassiz (?)/Laurentide ice sheet drainage event through the Mackenzie route. Following this event, the Holocene depicts a 5-fold reduction in IRD rates with a shift towards prominent sea-ice production along Russian shelves. From a methodological viewpoint, we demonstrate that radiogenic isotopes must be used in a multi-proxy approach to better constrain IRD and sea-ice sources and routes. From a paleoceanographic perspective, we conclude that an Arctic freshwater/sea-ice export route should now be seen as the most likely mechanism for an AMOC reduction during the YD in accordance with more recent improved model experiment. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60474
Appears in Collections: 过去全球变化的重建
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作者单位: GEOTOP-UQAM, CP 8888, Montreal, QC H3C 3P8, Canada; Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, University of Tokyo, Japan
Recommended Citation:
Hillaire-Marcel C.,Maccali J.,Not C.,et al. Geochemical and isotopic tracers of Arctic sea ice sources and export with special attention to the Younger Dryas interval[J]. Quaternary Science Reviews,2013-01-01,79