DOI: 10.1016/j.quascirev.2016.02.003
Scopus记录号: 2-s2.0-84957541927
论文题名: Isotopic record of Pleistocene glacial/interglacial cycles in pelagic carbonates: Revisiting historical data from the Caribbean Sea
作者: Hermoso M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 137 起始页码: 69
结束页码: 78
语种: 英语
英文关键词: Coccoliths
; Foraminifera
; Glacials/interglacials
; Low latitude realm
; Pleistocene
; Stable isotopes
; Surface water chemistry
; Vital effect
Scopus关键词: Carbon dioxide
; Glacial geology
; Oxygen
; Surface waters
; Coccoliths
; Foraminifera
; Glacials/interglacials
; Low latitudes
; Pleistocene
; Stable isotopes
; Surface-water chemistry
; Vital effects
; Isotopes
; Foraminifera
; Haptophyceae
英文摘要: The glacial/interglacial cycles of the Pleistocene were first recognised by variations in the oxygen isotopic composition of planktonic foraminifera from cores in the Caribbean Sea. Since this pioneering work by Emiliani, this proxy has been extensively applied to a variety of carbonate biominerals over the entirety of the Meso-Cenozoic. However, palaeoceanographic studies have overwhelmingly focused on foraminifera compared to other calcifying microorganism fossils, such as the coccoliths. In this study, I revisit coccolith stable isotopic data obtained from the classic P6304-4 core in light of recent developments in the biogeochemistry of coccolithophores. In particular, I show that the coccolith stable isotope record of the last 13 Marine Isotope Stages (~480 kyrs) is significantly biased by large vital effects. The magnitude of coccolith carbon and oxygen isotope vital effects is not uniform, but shows remarkable co-variance with the Vostok CO2 ice record. During periods of relatively elevated CO2 (interstadials), the expression of the vital effect is relatively small, whereas it can as high as +3‰ for the oxygen isotopes during glacial stadials, which I argue is a result of enhanced CO2 limitation of coccolithophores. Using this paradigm, I propose that coccolithophore vital effects are not a complicating factor, but rather the signal of interest. As the magnitude of the coccolith vital effect is shown to scale with pCO2, coccolith carbon and oxygen isotopes may be used in conjunction with foraminifera data to reconstruct and refine aqueous CO2 concentrations in the past. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59647
Appears in Collections: 过去全球变化的重建
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作者单位: University of Oxford, Department of Earth Sciences, South Parks Road, Oxford, United Kingdom
Recommended Citation:
Hermoso M.. Isotopic record of Pleistocene glacial/interglacial cycles in pelagic carbonates: Revisiting historical data from the Caribbean Sea[J]. Quaternary Science Reviews,2016-01-01,137