气候变化领域集成服务门户(CCPortal): Carbon isotope minima in the South Atlantic during the last deglaciation: Evaluating the influence of air-sea gas exchange

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DOI	10.1088/1748-9326/ab126f
	Carbon isotope minima in the South Atlantic during the last deglaciation: Evaluating the influence of air-sea gas exchange
	Lund D.; Hertzberg J.; Lacerra M.
发表日期	2019
ISSN	17489318
卷号	14 期号:5
英文摘要	Carbon isotope minima were a ubiquitous feature in the mid-depth (1.5-2.5 km) Atlantic during Heinrich Stadial 1 (HS1, 14.5-17.5 kyr BP) and the Younger Dryas (YD, 11.6-12.9 kyr BP), with the most likely driver being collapse of the Atlantic Meridional Overturning Circulation (AMOC). Negative carbon isotope anomalies also occurred throughout the surface ocean and atmosphere, but their timing relative to AMOC collapse and the underlying drivers have remained unclear. Here we evaluate the lead-lag relationship between AMOC variability and surface ocean δ 13C signals using high resolution benthic and planktonic stable isotope records from two Brazil Margin cores (located at 1.8 km and 2.1 km water depth). In each case, the decrease in benthic δ 13C during HS1 leads planktonic δ 13C by 800 ± 200 years. Because the records are based on the same samples, the relative timing is constrained by the core stratigraphy. Our results imply that AMOC collapse initiates a chain of events that propagates through the oceanic carbon cycle in less than 1 kyr. Direct comparison of planktonic foraminiferal and atmospheric records implies a portion of the surface ocean δ 13C signal can be explained by temperature-dependent equilibration with a 13C-depleted atmosphere, with the remainder due to biological productivity, input of carbon from the abyss, or reduced air-sea equilibration. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	air-sea gas exchange; Atlantic meridional overturning circulation; carbon isotopes; deglaciation
语种	英语
scopus关键词	Carbon; Glacial geology; Isotopes; Stratigraphy; Atlantic meridional overturning circulations; Biological productivity; Carbon isotopes; Deglaciations; Gas exchange; High resolution; Last deglaciation; Temperature dependent; Oceanography; air-sea interaction; carbon cycle; carbon isotope; deglaciation; gas exchange; last deglaciation; meridional circulation; overturn; paleoceanography; stable isotope; Younger Dryas; Atlantic Ocean; Atlantic Ocean (South); Brazil
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154590
作者单位	Department of Marine Sciences, University of Connecticut, United States; Department of Ocean and Marine Sciences, Old Dominion University, Earth, United States; Department of Geosciences, Princeton University, United States
推荐引用方式 GB/T 7714	Lund D.,Hertzberg J.,Lacerra M.. Carbon isotope minima in the South Atlantic during the last deglaciation: Evaluating the influence of air-sea gas exchange[J],2019,14(5).
APA	Lund D.,Hertzberg J.,&Lacerra M..(2019).Carbon isotope minima in the South Atlantic during the last deglaciation: Evaluating the influence of air-sea gas exchange.Environmental Research Letters,14(5).
MLA	Lund D.,et al."Carbon isotope minima in the South Atlantic during the last deglaciation: Evaluating the influence of air-sea gas exchange".Environmental Research Letters 14.5(2019).