DOI: 10.1016/j.quascirev.2013.08.014
Scopus记录号: 2-s2.0-84884363402
论文题名: Millennial-scale ice rafting events and Hudson Strait Heinrich(-like) Events during the late Pliocene and Pleistocene: A review
作者: Naafs B.D.A. ; Hefter J. ; Stein R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 80 起始页码: 1
结束页码: 28
语种: 英语
英文关键词: Alkenone
; Biomarker
; Heinrich Event
; Hudson Strait
; Ice-rafted debris
; Laurentide
; North Atlantic
; Pleistocene
; Pliocene
Scopus关键词: Alkenones
; Heinrich Events
; Hudson Strait
; Laurentide
; North Atlantic
; Pleistocene
; Pliocene
; Biomarkers
; Debris
; Glaciers
; Inorganic compounds
; Sea ice
; Silicates
; Submarine geology
; Oceanography
; alkenone
; biomarker
; core analysis
; Dansgaard-Oeschger cycle
; Heinrich event
; ice movement
; ice rafting
; ice stream
; ice-rafted debris
; iceberg calving
; Last Glacial
; Laurentide Ice Sheet
; literature review
; marine sediment
; Pliocene
; Scandinavian Ice Sheet
; Arctic
; Atlantic Ocean
; Atlantic Ocean (North)
; Canada
; Greenland
; Greenland Ice Sheet
; Hudson Strait
英文摘要: Various types of abrupt/millennial-scale climate variability such as Dansgaard/Oeschger and Heinrich Events characterized the last glacial period. Over the last decade, a number of studies demonstrated that such millennial-scale climate variability was not limited to the last glacial but inherent to Quaternary climate. Here we review the occurrence and origin of millennial ice-rafting events in the North Atlantic during the late Pliocene and Pleistocene (last 3.4Ma) with a special focus on North Atlantic Hudson Strait (HS) Heinrich(-like) Events.We show that Heinrich Layers 5, 4, 2, and 1 in marine sediment cores from across the North Atlantic all bear the organic geochemical fingerprint of the Hudson area. Using this framework and combining previously published results, detailed investigations into the organic and inorganic chemistry of ice-rafted debris (IRD) found across the North Atlantic demonstrate that prior to MIS 16 (~650ka) IRD in the North Atlantic did not originate from the Hudson area of northern Canada. The signature of this early IRD is distinctly different compared to that of HS Heinrich Layers. Rather ice-rafting events during the late Pliocene and early Pleistocene predominantly emanated from the calving of the Greenland and Fennoscandian ice sheets and possibly minor contributions from local ice streams from the North American and British ice sheets. Compared to North Atlantic HS Heinrich Events, these early Pleistocene IRD-events had a limited impact on surface water characteristics in the North Atlantic. North Atlantic HS Heinrich(-like) Events first occurred during MIS 16. At the same time, the dominant frequency in silicate-rich IRD accumulation shifted from the obliquity (41-ka) to a 100-ka frequency across the North Atlantic. Iceberg survivability or a change in iceberg trajectory likely did not control this change in IRD-regime. These results lend further support for the existing hypothesis that an increase in size (thickness) of the Laurentide ice sheet controls the occurrence of North Atlantic HS Heinrich Events, favoring an internal dynamic mechanism for their occurrence. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60532
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Alfred Wegener Institute for Polar and Marine Research, Department of Marine Geology and Paleontology, D-27568 Bremerhaven, Germany
Recommended Citation:
Naafs B.D.A.,Hefter J.,Stein R.. Millennial-scale ice rafting events and Hudson Strait Heinrich(-like) Events during the late Pliocene and Pleistocene: A review[J]. Quaternary Science Reviews,2013-01-01,80