DOI: 10.1038/ngeo2317
论文题名: Glacial-interglacial changes in bottom-water oxygen content on the Portuguese margin
作者: Hoogakker B.A.A. ; Elderfield H. ; Schmiedl G. ; McCave I.N. ; Rickaby R.E.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 1 起始页码: 40
结束页码: 43
语种: 英语
Scopus关键词: benthic foraminifera
; biological pump
; carbon dioxide
; glacial-interglacial cycle
; global change
; oxygen
; water mass
; Atlantic Ocean
; Portugal
; Foraminifera
英文摘要: During the last and penultimate glacial maxima, atmospheric CO2 concentrations were lower than present, possibly in part because of increased storage of respired carbon in the deep oceans. The amount of respired carbon present in a water mass can be calculated from its oxygen content through apparent oxygen utilization; the oxygen content can in turn be calculated from the carbon isotope gradient within the sediment column. Here we analyse the shells of benthic foraminifera occurring at the sediment surface and the oxic/anoxic interface on the Portuguese Margin to reconstruct the carbon isotope gradient and hence bottom-water oxygenation over the past 150,000 years. We find that bottom-water oxygen concentrations were 45 and 65 μmol kg-1 lower than present during the last and penultimate glacial maxima, respectively. We calculate that concentrations of remineralized organic carbon were at least twice as high as today during the glacial maxima. We attribute these changes to decreased ventilation linked to a reorganization of ocean circulation and a strengthened global biological pump. If the respired carbon pool was of a similar size throughout the entire glacial deep Atlantic basin, then this sink could account for 15 and 20 per cent of the glacial P CO2 drawdown during the last and penultimate glacial maxima. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106204
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, United Kingdom; Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, United Kingdom; Universität Hamburg, Centrum für Erdsystemforschung und Nachhaltigkeit, Institut für Geologie, Bundesstrasse 55, Hamburg, Germany
Recommended Citation:
Hoogakker B.A.A.,Elderfield H.,Schmiedl G.,et al. Glacial-interglacial changes in bottom-water oxygen content on the Portuguese margin[J]. Nature Geoscience,2015-01-01,8(1)