DOI: 10.5194/cp-14-515-2018
Scopus记录号: 2-s2.0-85045886141
论文题名: Moving beyond the age-depth model paradigm in deep-sea palaeoclimate archives: Dual radiocarbon and stable isotope analysis on single foraminifera
作者: Lougheed B.C. ; Metcalfe B. ; Ninnemann U.S. ; Wacker L.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2018
卷: 14, 期: 4 起始页码: 515
结束页码: 526
语种: 英语
Scopus关键词: bioturbation
; carbon isotope
; deep sea
; foraminifera
; geoaccumulation
; isotopic analysis
; paleoceanography
; paleoclimate
; radiocarbon dating
; seafloor
; sedimentation
; stable isotope
; temporal analysis
; Foraminifera
; Zoophycos
英文摘要: Late-glacial palaeoclimate reconstructions from deep-sea sediment archives provide valuable insight into past rapid changes in ocean chemistry. Unfortunately, only a small proportion of the ocean floor with sufficiently high sediment accumulation rate (SAR) is suitable for such reconstructions using the long-standing age-depth model approach. We employ ultra-small radiocarbon (14C) dating on single microscopic foraminifera to demonstrate that the long-standing age-depth model method conceals large age uncertainties caused by post-depositional sediment mixing, meaning that existing studies may underestimate total geochronological error. We find that the age-depth distribution of our 14C-dated single foraminifera is in good agreement with existing bioturbation models only after one takes the possibility of Zoophycos burrowing into account. To overcome the problems associated with the age-depth paradigm, we use the first ever dual 14C and stable isotope (δ18O and δ13C) analysis on single microscopic foraminifera to produce a palaeoclimate time series independent of the age-depth paradigm. This new state of the art essentially decouples single foraminifera from the age-depth paradigm to provide multiple floating, temporal snapshots of ocean chemistry, thus allowing for the successful extraction of temporally accurate palaeoclimate data from low-SAR deep-sea archives. This new method can address large geographical gaps in late-glacial benthic palaeoceanographic reconstructions by opening up vast areas of previously disregarded, low-SAR deep-sea archives to research, which will lead to an improved understanding of the global interaction between oceans and climate. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109575
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Earth Sciences, Uppsala University, Villavägen 16, Uppsala, 75236, Sweden; Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, 91190, France; Department of Earth Sciences, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, Amsterdam, 1081HV, Netherlands; Department of Earth Science, University of Bergen, Allégaten 41, Bergen, 5007, Norway; Laboratory for Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, Zürich, 8093, Switzerland
Recommended Citation:
Lougheed B.C.,Metcalfe B.,Ninnemann U.S.,et al. Moving beyond the age-depth model paradigm in deep-sea palaeoclimate archives: Dual radiocarbon and stable isotope analysis on single foraminifera[J]. Climate of the Past,2018-01-01,14(4)