气候变化领域集成服务门户(CCPortal): Persistently well-ventilated intermediate-depth ocean through the last deglaciation

CCPortal

DOI	10.1038/s41561-020-0638-6
	Persistently well-ventilated intermediate-depth ocean through the last deglaciation
	Chen T.; Robinson L.F.; Burke A.; Claxton L.; Hain M.P.; Li T.; Rae J.W.B.; Stewart J.; Knowles T.D.J.; Fornari D.J.; Harpp K.S.
发表日期	2020
ISSN	17520894
起始页码	733
结束页码	738
卷号	13 期号:11
英文摘要	During the last deglaciation (~18–11 thousand years ago), existing radiocarbon (14C) reconstructions of intermediate waters in the mid- to low-latitude oceans show widely diverging trends, with some broadly tracking the atmosphere and others suggesting extreme depletions. These discrepancies cloud our understanding of the deglacial carbon cycle because of the diversity of hypotheses needed to explain these diverging records, for example, injections of 14C-dead geological carbon, mixing of extremely isolated waters from the abyssal ocean or changes in sites of deep-water ventilation. Here we present absolutely dated deglacial deep-sea coral 14C records of intermediate waters from the Galápagos Platform—close to the largest reported deglacial 14C depletions—together with data from the low-latitude Atlantic. Our records indicate coherent, well-equilibrated intermediate-water 14C ventilation in both oceans relative to the atmosphere throughout the deglaciation. The observed overall trend towards 14C-enriched signatures in our records is largely due to enhanced air–sea carbon isotope exchange efficiency under increasing atmospheric pCO2. These results suggest that the 14C-depleted signatures from foraminifera are likely sedimentary rather than water mass features, and provide tight 14C constraints for modelling changes in circulation and carbon cycle during the last deglaciation. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	abyssal zone; air-sea interaction; carbon cycle; carbon isotope; deep sea; deep water ventilation; deep-sea organism; deglaciation; intermediate water; last deglaciation; radiocarbon dating; reconstruction; tracking; ventilation; water mass; Ecuador; Galapagos Islands; Anthozoa; Foraminifera
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206758
作者单位	State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China; School of Earth Sciences, University of Bristol, Bristol, United Kingdom; School of Earth and Environmental Sciences, University of St Andrews, St Andrews, United Kingdom; Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA, United States; School of Chemistry, University of Bristol, Bristol, United Kingdom; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Geology Department, Colgate University, Hamilton, NY, United States
推荐引用方式 GB/T 7714	Chen T.,Robinson L.F.,Burke A.,et al. Persistently well-ventilated intermediate-depth ocean through the last deglaciation[J],2020,13(11).
APA	Chen T..,Robinson L.F..,Burke A..,Claxton L..,Hain M.P..,...&Harpp K.S..(2020).Persistently well-ventilated intermediate-depth ocean through the last deglaciation.Nature Geoscience,13(11).
MLA	Chen T.,et al."Persistently well-ventilated intermediate-depth ocean through the last deglaciation".Nature Geoscience 13.11(2020).