气候变化领域集成服务门户(CCPortal): Remineralization dominating the δ13C decrease in the mid-depth Atlantic during the last deglaciation

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DOI	10.1016/j.epsl.2021.117106
	Remineralization dominating the δ13C decrease in the mid-depth Atlantic during the last deglaciation
	Gu S.; Liu Z.; Oppo D.W.; Lynch-Stieglitz J.; Jahn A.; Zhang J.; Lindsay K.; Wu L.
发表日期	2021
ISSN	0012821X
卷号	571
英文摘要	δ13C records from the mid-depth Atlantic show a pronounced decrease during the Heinrich Stadial 1 (HS1), a deglacial episode of dramatically weakened Atlantic Meridional Ocean Circulation (AMOC). Proposed explanations for this mid-depth decrease include a greater fraction of δ13C-depleted southern sourced water (SSW), a δ13C decrease in the North Atlantic Deep Water (NADW) end-member, and accumulation of the respired organic carbon. However, the relative importance of these proposed mechanisms cannot be quantitatively constrained from current available observations alone. Here we diagnose the individual contributions to the deglacial Atlantic mid-depth δ13C change from these mechanisms using a transient simulation with carbon isotopes and idealized tracers. We find that although the fraction of the low-δ13C SSW increases in response to a weaker AMOC during HS1, the water mass mixture change only plays a minor role in the mid-depth Atlantic δ13C decrease. Instead, increased remineralization due to the AMOC-induced mid-depth ocean ventilation decrease is the dominant cause. In this study, we differentiate between the deep end-members, which are assigned to deep water regions used in previous paleoceanography studies, and the surface end-members, which are from the near-surface water defined from the physical origin of deep water masses. We find that the deep NADW end-member includes additional remineralized material accumulated when sinking from the surface (surface NADW end-member). Therefore, the surface end-members should be used in diagnosing mechanisms of δ13C changes. Furthermore, our results suggest that remineralization in the surface end-member is more critical than the remineralization along the transport pathway from the near-surface formation region to the deep ocean, especially during the early deglaciation. © 2021 The Author(s)
关键词	end-member HS1 remineralization water mass composition δ13C
英文关键词	Organic carbon; Surface waters; $+13$/C; Deglacial; Endmembers; Heinrich stadial 1; Near surfaces; North Atlantic Deep Water; Ocean circulation; Remineralization; Water mass composition; Δ13C; Oceanography
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203109
作者单位	School of Oceanography, Shanghai Jiao Tong University, Shanghai, China; Open Studio for Ocean-Climate-Isotope Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, China; Atmospheric Science Program, Department of Geography, The Ohio State University, Columbus, OH, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Department for Atmospheric and Oceanic Sciences, Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; Cooperative Institute for Climate, Ocean, and Ecosystem Studies, University of Washington, Seattle, WA, United States; NOAA Pacific Marine Environmental Laboratory, Seattle, WA, United States; National Center for Atmospheric Research, Climate and Global Dynamics Division, Boulder, CO, United States; Physical Oceanography Laboratory, Ocean Un...
推荐引用方式 GB/T 7714	Gu S.,Liu Z.,Oppo D.W.,et al. Remineralization dominating the δ13C decrease in the mid-depth Atlantic during the last deglaciation[J],2021,571.
APA	Gu S..,Liu Z..,Oppo D.W..,Lynch-Stieglitz J..,Jahn A..,...&Wu L..(2021).Remineralization dominating the δ13C decrease in the mid-depth Atlantic during the last deglaciation.Earth and Planetary Science Letters,571.
MLA	Gu S.,et al."Remineralization dominating the δ13C decrease in the mid-depth Atlantic during the last deglaciation".Earth and Planetary Science Letters 571(2021).