DOI: 10.1016/j.quascirev.2016.08.035
Scopus记录号: 2-s2.0-84988531077
论文题名: Geochemical response of the mid-depth Northeast Atlantic Ocean to freshwater input during Heinrich events 1 to 4
作者: Crocker A.J. ; Chalk T.B. ; Bailey I. ; Spencer M.R. ; Gutjahr M. ; Foster G.L. ; Wilson P.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 151 起始页码: 236
结束页码: 254
语种: 英语
英文关键词: B/Ca
; Carbon and oxygen isotopes
; Heinrich events
; Ice-rafted debris
; Last glacial period
; Neodymium isotopes
; North Atlantic palaeoceanography
; ODP Site 980
Scopus关键词: Exploratory geochemistry
; Geochemistry
; Glacial geology
; Isotopes
; Neodymium
; Sea ice
; Water
; Carbon and oxygen isotopes
; Heinrich Events
; Ice rafted debris
; Last glacial period
; Neodymium isotopes
; ODP Site 980
; Palaeoceanography
; Oceanography
; boron isotope
; calcite
; calcium
; carbon isotope
; deep water formation
; freshwater input
; geochemistry
; Heinrich event
; ice-rafted debris
; intermediate water
; Last Glacial
; meridional circulation
; neodymium isotope
; Ocean Drilling Program
; oxygen isotope
; paleoceanography
; Atlantic Ocean
; Atlantic Ocean (Northeast)
英文摘要: Heinrich events are intervals of rapid iceberg-sourced freshwater release to the high latitude North Atlantic Ocean that punctuate late Pleistocene glacials. Delivery of fresh water to the main North Atlantic sites of deep water formation during Heinrich events may result in major disruption to the Atlantic Meridional Overturning Circulation (AMOC), however, the simple concept of an AMOC shutdown in response to each freshwater input has recently been shown to be overly simplistic. Here we present a new multi-proxy dataset spanning the last 41,000 years that resolves four Heinrich events at a classic mid-depth North Atlantic drill site, employing four independent geochemical tracers of water mass properties: boron/calcium, carbon and oxygen isotopes in foraminiferal calcite and neodymium isotopes in multiple substrates. We also report rare earth element distributions to investigate the fidelity by which neodymium isotopes record changes in water mass distribution in the northeast North Atlantic. Our data reveal distinct geochemical signatures for each Heinrich event, suggesting that the sites of fresh water delivery and/or rates of input played at least as important a role as the stage of the glacial cycle in which the fresh water was released. At no time during the last 41 kyr was the mid-depth northeast North Atlantic dominantly ventilated by southern-sourced water. Instead, we document persistent ventilation by Glacial North Atlantic Intermediate Water (GNAIW), albeit with variable properties signifying changes in supply from multiple contributing northern sources. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59425
Appears in Collections: 过去全球变化的重建
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作者单位: National Oceanography Centre Southampton, University of Southampton, Waterfront Campus, European Way, Southampton, United Kingdom; Department of Animal and Plant Science, University of Sheffield, Western Bank, Sheffield, United Kingdom; Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Recommended Citation:
Crocker A.J.,Chalk T.B.,Bailey I.,et al. Geochemical response of the mid-depth Northeast Atlantic Ocean to freshwater input during Heinrich events 1 to 4[J]. Quaternary Science Reviews,2016-01-01,151