globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2019.116055
论文题名:
I/Ca in epifaunal benthic foraminifera: A semi-quantitative proxy for bottom water oxygen in a multi-proxy compilation for glacial ocean deoxygenation
作者: Lu W.; Rickaby R.E.M.; Hoogakker B.A.A.; Rathburn A.E.; Burkett A.M.; Dickson A.J.; Martínez-Méndez G.; Hillenbrand C.-D.; Zhou X.; Thomas E.; Lu Z.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 533
语种: 英语
英文关键词: benthic foraminifera ; bottom water oxygen ; Cibicidoides spp ; glacial-interglacial cycles ; I/Ca
Scopus关键词: Biochemical oxygen demand ; Biogeochemistry ; Calcium compounds ; Climate models ; Ecosystems ; Glacial geology ; Global warming ; Microwave oscillators ; Oceanography ; Organic compounds ; Oxygenation ; Benthic foraminifera ; Bottom water ; Cibicidoides spp ; Glacial-interglacial cycles ; Ocean biogeochemistry ; Ocean circulation ; Pleistocene glacial ; Quantitative estimates ; Dissolved oxygen ; benthic foraminifera ; climate modeling ; dissolved oxygen ; glacial-interglacial cycle ; Holocene ; oceanic circulation ; organic matter ; paleoclimate ; paleoenvironment ; Pleistocene ; Atlantic Ocean ; Pacific Ocean ; Cibicidoides ; Foraminifera
英文摘要: The decline in dissolved oxygen in global oceans (ocean deoxygenation) is a potential consequence of global warming which may have important impacts on ocean biogeochemistry and marine ecosystems. Current climate models do not agree on the trajectory of future deoxygenation on different timescales, in part due to uncertainties in the complex, linked effects of changes in ocean circulation, productivity and organic matter respiration. More (semi-)quantitative reconstructions of oceanic oxygen levels over the Pleistocene glacial cycles may provide a critical test of our mechanistic understanding of the response of oceanic oxygenation to climate change. Even the most promising proxies for bottom water oxygen (BWO) have limitations, which calls for new proxy development and a multi-proxy compilation to evaluate glacial ocean oxygenation. We use Holocene benthic foraminifera to explore I/Ca in Cibicidoides spp. as a BWO proxy. We propose that low I/Ca (e.g., <3 μmol/mol) in conjunction with benthic foraminiferal carbon isotope gradients and/or the surface pore area percentages in foraminiferal tests (e.g., >15%) may provide semi-quantitative estimates of low BWO in past oceans (e.g., <∼50 μmol/kg). We present I/Ca records in five cores and a global compilation of multiproxy data, indicating that bottom waters were generally less-oxygenated during glacial periods, with low O2 waters (<∼50 μmol/kg) occupying some parts of the Atlantic and Pacific Oceans. Water mass ventilation and circulation may have been important in deoxygenation of the glacial deep Pacific and South Atlantic, whereas enhanced remineralization of organic matter may have had a greater impact on reducing the oxygen content of the interior Atlantic Ocean. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158938
Appears in Collections:气候变化与战略

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作者单位: Department of Earth Sciences, Syracuse University, Syracuse, NY, United States; Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; The Lyell Center, Heriot-Watt University, Edinburgh, United Kingdom; Department of Geological Sciences, California State University, Bakersfield, CA, United States; Boone Pickens School of Geology, Oklahoma State University, Stillwater, OK, United States; Department of Earth Sciences, Royal Holloway University of London, Egham, United Kingdom; MARUM – Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Germany; British Antarctic Survey, Cambridge, United Kingdom; Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, United States; Department of Geology and Geophysics, Yale University, New Haven, CT, United States; Department of Earth and Environmental Sciences, Wesleyan University, Middletown, CT, United States

Recommended Citation:
Lu W.,Rickaby R.E.M.,Hoogakker B.A.A.,et al. I/Ca in epifaunal benthic foraminifera: A semi-quantitative proxy for bottom water oxygen in a multi-proxy compilation for glacial ocean deoxygenation[J]. Earth and Planetary Science Letters,2020-01-01,533
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