气候变化领域集成服务门户(CCPortal): Eocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometry

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DOI	10.1073/pnas.1714744115
	Eocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometry
	Evans D.; Sagoo N.; Renema W.; Cotton L.J.; Müller W.; Todd J.A.; Saraswati P.K.; Stassen P.; Ziegler M.; Pearson P.N.; Valdes P.J.; Affek H.P.
发表日期	2018
ISSN	0027-8424
起始页码	1174
结束页码	1179
卷号	115 期号:6
英文摘要	Past greenhouse periods with elevated atmospheric CO2 were characterized by globally warmer sea-surface temperatures (SST). However, the extent to which the high latitudes warmed to a greater degree than the tropics (polar amplification) remains poorly constrained, in particular because there are only a few temperature reconstructions from the tropics. Consequently, the relationship between increased CO2, the degree of tropical warming, and the resulting latitudinal SST gradient is not well known. Here, we present coupled clumped isotope (Δ47)-Mg/Ca measurements of foraminifera from a set of globally distributed sites in the tropics and midlatitudes. Δ47 is insensitive to seawater chemistry and therefore provides a robust constraint on tropical SST. Crucially, coupling these data with Mg/Ca measurements allows the precise reconstruction of Mg/Casw throughout the Eocene, enabling the reinterpretation of all planktonic foraminifera Mg/Ca data. The combined dataset constrains the range in Eocene tropical SST to 30-36 °C (from sites in all basins). We compare these accurate tropical SST to deep-ocean temperatures, serving as a minimum constraint on high-latitude SST. This results in a robust conservative reconstruction of the early Eocene latitudinal gradient, which was reduced by at least 32 ± 10% compared with present day, demonstrating greater polar amplification than captured by most climate models.
英文关键词	Clumped isotope; Eocene; Polar amplification; Seawater Mg/Ca; Tropical sea-surface temperatures
语种	英语
scopus关键词	calcium; magnesium; sea water; Article; environmental impact assessment; Eocene; evolution; foraminifer; fossil; geochemistry; greenhouse effect; isotope analysis; nonhuman; priority journal; sea surface temperature; temperature sensitivity; thermometry; tropics
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160546
作者单位	Evans, D., Department of Geology and Geophysics, Yale University, New Haven, CT 06511, United States, School of Earth and Environmental Sciences, University of St Andrews, St Andrews, KY16 9AL, United Kingdom; Sagoo, N., Department of Geology and Geophysics, Yale University, New Haven, CT 06511, United States; Renema, W., Naturalis Biodiversity Center, Leiden, 2300 RA, Netherlands; Cotton, L.J., Naturalis Biodiversity Center, Leiden, 2300 RA, Netherlands, Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, United States, Department of Geosciences, University of Florida, Gainesville, FL 32611, United States; Müller, W., Institute of Geosciences, Goethe University Frankfurt, Frankfurt, 60438, Germany, Department of Earth Sciences, Royal Holloway University of London, Egham, TW20 0EX, United Kingdom; Todd, J.A., Department of Earth Sciences, Natural History Museum, London, SW7 5BD, United Kingdom; Saraswati, P.K., Department of Earth Sciences, Indian Institute of Technology B...
推荐引用方式 GB/T 7714	Evans D.,Sagoo N.,Renema W.,et al. Eocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometry[J],2018,115(6).
APA	Evans D..,Sagoo N..,Renema W..,Cotton L.J..,Müller W..,...&Affek H.P..(2018).Eocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometry.Proceedings of the National Academy of Sciences of the United States of America,115(6).
MLA	Evans D.,et al."Eocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometry".Proceedings of the National Academy of Sciences of the United States of America 115.6(2018).