气候变化领域集成服务门户(CCPortal): Deep-Sea Oxygen Depletion and Ocean Carbon Sequestration During the Last Ice Age

CCPortal

DOI	10.1029/2018GB006049
	Deep-Sea Oxygen Depletion and Ocean Carbon Sequestration During the Last Ice Age
	Anderson R.F.; Sachs J.P.; Fleisher M.Q.; Allen K.A.; Yu J.; Koutavas A.; Jaccard S.L.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	301
结束页码	317
卷号	33 期号:3
英文摘要	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.
英文关键词	alkenones; bottom-water oxygen; last glacial period; lipid biomarkers; ocean carbon storage
语种	英语
scopus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)
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129738
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
推荐引用方式 GB/T 7714	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],2019,33(3).
APA	Anderson R.F..,Sachs J.P..,Fleisher M.Q..,Allen K.A..,Yu J..,...&Jaccard S.L..(2019).Deep-Sea Oxygen Depletion and Ocean Carbon Sequestration During the Last Ice Age.Global Biogeochemical Cycles,33(3).
MLA	Anderson R.F.,et al."Deep-Sea Oxygen Depletion and Ocean Carbon Sequestration During the Last Ice Age".Global Biogeochemical Cycles 33.3(2019).