globalchange  > 气候变化与战略
DOI: 10.1029/2018GB006049
论文题名:
Deep-Sea Oxygen Depletion and Ocean Carbon Sequestration During the Last Ice Age
作者: Anderson R.F.; Sachs J.P.; Fleisher M.Q.; Allen K.A.; Yu J.; Koutavas A.; Jaccard S.L.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期:3
语种: 英语
英文关键词: alkenone ; atmosphere-biosphere interaction ; biological pump ; biomarker ; bottom water ; carbon sequestration ; concentration (composition) ; deep sea ; dissolved oxygen ; interglacial ; Last Glacial ; lipid ; Pleistocene ; water column ; Pacific Ocean ; Pacific Ocean (Equatorial)
学科: alkenones ; bottom-water oxygen ; last glacial period ; lipid biomarkers ; ocean carbon storage
中文摘要: Enhanced ocean carbon storage during the Pleistocene ice ages lowered atmospheric CO2 concentrations by 80 to 100 ppm relative to interglacial levels. Leading hypotheses to explain this phenomenon invoke a greater efficiency of the ocean's biological pump, in which case carbon storage in the deep sea would have been accompanied by a corresponding reduction in dissolved oxygen. We exploit the sensitivity of organic matter preservation in marine sediments to bottom water oxygen concentration to constrain the level of dissolved oxygen in the deep central equatorial Pacific Ocean during the last glacial period (18,000–28,000 years BP) to have been within the range of 20–50 μmol/kg, much less than the modern value of ~168 μmol/kg. We further demonstrate that reduced oxygen levels characterized the water column below a depth of ~1,000 m. Converting the ice age oxygen level to an equivalent concentration of respiratory CO2, and extrapolating globally, we estimate that deep-sea CO2 storage during the last ice age exceeded modern values by as much as 850 Pg C, sufficient to balance the loss of carbon from the atmosphere (~200 Pg C) and from the terrestrial biosphere (~300–600 Pg C). In addition, recognizing the enhanced preservation of organic matter in ice age sediments of the deep Pacific Ocean helps reconcile previously unexplained inconsistencies among different geochemical and micropaleontological proxy records used to assess past changes in biological productivity of the ocean. ©2019. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160141
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作者单位: Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Department of Earth and Environmental Sciences, Columbia University, Palisades, NY, United States; School of Oceanography, University of Washington, Seattle, WA, United States; School of Earth and Climate Science, University of Maine, Orono, ME, United States; Research School of Earth Sciences, The Australian National University, Canberra, ACT, Australia; Department of Engineering and Environmental Science, College of Staten Island, City University of New York, New York, NY, United States; Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland

Recommended Citation:
Anderson R.F.,Sachs J.P.,Fleisher M.Q.,et al. Deep-Sea Oxygen Depletion and Ocean Carbon Sequestration During the Last Ice Age[J]. Global Biogeochemical Cycles,2019-01-01,33(3)
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