DOI: 10.1016/j.palaeo.2015.09.042
论文题名: Precession-driven changes in Iceland-Scotland Overflow Water penetration and bottom water circulation on Gardar Drift since ~200ka
作者: Elmore A.C. ; Wright J.D. ; Chalk T.B.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 440 起始页码: 551
结束页码: 563
语种: 英语
英文关键词: Gardar Drift
; Insolation
; North Atlantic Deep Water
英文摘要: Benthic foraminiferal stable isotopic records from a transect of sediment cores south of the Iceland-Scotland Ridge reveal that the penetration depth of Iceland-Scotland Overflow Water (ISOW) varied on orbital timescales with precessional pacing over the past ~200kyr. Similar, higher benthic foraminiferal δ13C values (~1.0‰) were recorded at all transect sites downstream of the Iceland-Scotland Ridge during interglacial periods (Marine Isotope Chrons 5 and 1), indicating a deeply penetrating ISOW. During glacial periods (Marine Isotope Chrons 6, 4, and 2), benthic foraminiferal δ13C values from the deeper (2700-3300m), southern sites within this transect were significantly lower (~0.5‰) than values from the northern (shallower) portion of the transect (~1.0‰), reflecting a shoaling of ISOW and greater influence of glacial Southern Component Water (SCW) in the deep Northeast Atlantic. Particularly during intermediate climate states, ISOW strength is driven by precessional cycles, superimposed on the large-scale glacial-interglacial ISOW variability. Millennial-scale variability in the penetration of ISOW, likely caused by high-frequency Heinrich and Dansgaard-Oeschger events, is most pronounced during intermediate climate states. © 2015 Elsevier B.V.. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68719
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, Durham University, Durham, United Kingdom; Department of Earth and Planetary Sciences, Rutgers University, New Brunswick, NJ, United States; Department of Physical Oceanography, Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA, United States
Recommended Citation:
Elmore A.C.,Wright J.D.,Chalk T.B.. Precession-driven changes in Iceland-Scotland Overflow Water penetration and bottom water circulation on Gardar Drift since ~200ka[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,440