globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1420232112
论文题名:
Atmospheric composition 1 million years ago from blue ice in the Allan Hills; Antarctica
作者: 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.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2015
卷: 112, 期:22
起始页码: 6887
结束页码: 6891
语种: 英语
英文关键词: Atmospheric co2 ; Climate change ; Glacial cycles ; Greenhouse gases ; Ice cores
Scopus关键词: carbon dioxide ; Antarctica ; Article ; atmosphere ; atmospheric deposition ; climate ; glacial period ; interglacial ; Pleistocene ; priority journal ; temperature
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162128
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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 Geosciences, Princeton University, Princeton, NJ 08544, United States

Recommended Citation:
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]. Proceedings of the National Academy of Sciences of the United States of America,2015-01-01,112(22)
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