globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.117106
论文题名:
Remineralization dominating the δ13C decrease in the mid-depth Atlantic during the last deglaciation
作者: Gu S.; Liu Z.; Oppo D.W.; Lynch-Stieglitz J.; Jahn A.; Zhang J.; Lindsay K.; Wu L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 571
语种: 英语
中文关键词: 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
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)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165487
Appears in Collections:气候变化与战略

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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 University of China, Qingdao, China

Recommended Citation:
Gu S.,Liu Z.,Oppo D.W.,et al. Remineralization dominating the δ13C decrease in the mid-depth Atlantic during the last deglaciation[J]. Earth and Planetary Science Letters,2021-01-01,571
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