globalchange  > 过去全球变化的重建
DOI: 10.1029/2018PA003444
WOS记录号: WOS:000481820300002
论文题名:
Improving North Atlantic Marine Core Chronologies Using Th-230 Normalization
作者: Missiaen, L.1,2; Waelbroeck, C.1; Pichat, S.1,3,4; Jaccard, S. L.5,6; Eynaud, F.7; Greenop, R.8; Burke, A.8
通讯作者: Missiaen, L.
刊名: PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
ISSN: 2572-4517
EISSN: 2572-4525
出版年: 2019
卷: 34, 期:7, 页码:1057-1073
语种: 英语
英文关键词: Th normalization ; North Atlantic marine chronologies
WOS关键词: MERIDIONAL OVERTURNING CIRCULATION ; CENTRAL EQUATORIAL PACIFIC ; LAST DEGLACIATION ; OCEAN CIRCULATION ; CLIMATE-CHANGE ; DUST FLUX ; VARIABILITY ; SEA ; TEMPERATURE ; RECORDS
WOS学科分类: Geosciences, Multidisciplinary ; Oceanography ; Paleontology
WOS研究方向: Geology ; Oceanography ; Paleontology
英文摘要:

Producing independent and accurate chronologies for marine sediments is a prerequisite to understand the sequence of millennial-scale events and reveal potential temporal offsets between marine and continental records, or between different marine records, possibly from different regions. The last 40 ky is a generally well-constrained period since radiocarbon (C-14) can be used as an absolute dating tool. However, in the northern North Atlantic, calendar ages cannot be directly derived from C-14 ages, due to temporal and spatial variations of surface reservoir ages. Alternatively, chronologies can be derived by aligning Greenland ice-core time series with marine surface records. Yet this approach suffers from the lack of clearly defined climatic events between 14.7 and 23.3 cal ky BP (hereafter ka), a crucial period encompassing Heinrich Stadial 1 and the onset of the last deglaciation. In this study, (i) we assess the benefits of Th-230 normalization to refine the sedimentation history between surface temperature alignment tie points and (ii) revisit the chronologies of three North Atlantic marine records. Our study supports the contention that the marked increase in the Greenland Ca2+ record at 17.48 ka +/- 0.21 ky (1 sigma) occurred within dating uncertainty of sea surface temperature cooling in the North Atlantic at the onset of Heinrich Stadial 1. This sharp feature might be useful for future chronostratigraphic alignments to remedy the lack of chronological constraint between 14.7 and 23.3 ka for North Atlantic marine records that are subject to large changes in C-14 surface reservoir age.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/140996
Appears in Collections:过去全球变化的重建

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作者单位: 1.Univ Paris Saclay, CEA, LSCE, IPSL,CNRS,UVSQ, Gif Sur Yvette, France
2.Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia
3.Univ Lyon, Lab Geol Lyon LGL TPE, ENS Lyon, Lyon, France
4.Max Planck Inst Chem, Climate Geochem Dept, Mainz, Germany
5.Univ Bern, Inst Geol Sci, Bern, Switzerland
6.Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland
7.Univ Bordeaux, UMR EPOC 5805, Pessac, France
8.Univ St Andrews, Sch Earth & Environm Sci, Irvine Bldg, St Andrews, Fife, Scotland

Recommended Citation:
Missiaen, L.,Waelbroeck, C.,Pichat, S.,et al. Improving North Atlantic Marine Core Chronologies Using Th-230 Normalization[J]. PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,2019-01-01,34(7):1057-1073
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