气候变化领域集成服务门户(CCPortal): Atmospheric composition 1 million years ago from blue ice in the Allan Hills; Antarctica

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DOI	10.1073/pnas.1420232112
	Atmospheric composition 1 million years ago from blue ice in the Allan Hills; Antarctica
	Higgins J.A.; Kurbatov A.V.; Spaulding N.E.; Brook E.; Introne D.S.; Chimiak L.M.; Yan Y.; Mayewski P.A.; Bender M.L.
发表日期	2015
ISSN	0027-8424
起始页码	6887
结束页码	6891
卷号	112 期号:22
英文摘要	Here, we present direct measurements of atmospheric composition and Antarctic climate from the mid-Pleistocene (∼1 Ma) from ice cores drilled in the Allan Hills blue ice area, Antarctica. The 1-Ma ice is dated from the deficit in 40Ar relative to the modern atmosphere and is present as a stratigraphically disturbed 12-m section at the base of a 126-m ice core. The 1-Ma ice appears to represent most of the amplitude of contemporaneous climate cycles and CO2 and CH4 concentrations in the ice range from 221 to 277 ppm and 411 to 569 parts per billion (ppb), respectively. These concentrations, together with measured δD of the ice, are at the warm end of the field for glacial-interglacial cycles of the last 800 ky and span only about one-half of the range. The highest CO2 values in the 1-Ma ice fall within the range of interglacial values of the last 400 ka but are up to 7 ppm higher than any interglacial values between 450 and 800 ka. The lowest CO2 values are 30 ppm higher than during any glacial period between 450 and 800 ka. This study shows that the coupling of Antarctic temperature and atmospheric CO2 extended into the mid-Pleistocene and demonstrates the feasibility of discontinuously extending the current ice core record beyond 800 ka by shallow coring in Antarctic blue ice areas. © 2015, National Academy of Sciences. All rights reserved.
英文关键词	Atmospheric co2; Climate change; Glacial cycles; Greenhouse gases; Ice cores
语种	英语
scopus关键词	carbon dioxide; Antarctica; Article; atmosphere; atmospheric deposition; climate; glacial period; interglacial; Pleistocene; priority journal; temperature
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/158910
作者单位	Higgins, J.A., Department of Geosciences, Princeton University, Princeton, NJ 08544, United States; Kurbatov, A.V., Climate Change Institute, University of Maine, Orono, ME 04469, United States, School of Earth and Climate Sciences, University of Maine, Orono, ME 04469, United States; Spaulding, N.E., Climate Change Institute, University of Maine, Orono, ME 04469, United States; Brook, E., College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States; Introne, D.S., Climate Change Institute, University of Maine, Orono, ME 04469, United States; Chimiak, L.M., Department of Geosciences, Princeton University, Princeton, NJ 08544, United States; Yan, Y., Department of Geosciences, Princeton University, Princeton, NJ 08544, United States; Mayewski, P.A., Climate Change Institute, University of Maine, Orono, ME 04469, United States, School of Earth and Climate Sciences, University of Maine, Orono, ME 04469, United States; Bender, M.L., Department of Geo...
推荐引用方式 GB/T 7714	Higgins J.A.,Kurbatov A.V.,Spaulding N.E.,et al. Atmospheric composition 1 million years ago from blue ice in the Allan Hills; Antarctica[J],2015,112(22).
APA	Higgins J.A..,Kurbatov A.V..,Spaulding N.E..,Brook E..,Introne D.S..,...&Bender M.L..(2015).Atmospheric composition 1 million years ago from blue ice in the Allan Hills; Antarctica.Proceedings of the National Academy of Sciences of the United States of America,112(22).
MLA	Higgins J.A.,et al."Atmospheric composition 1 million years ago from blue ice in the Allan Hills; Antarctica".Proceedings of the National Academy of Sciences of the United States of America 112.22(2015).