气候变化领域集成服务门户(CCPortal): Mid-Miocene cooling and the extinction of tundra in continental Antarctica

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DOI	10.1073/pnas.0802501105
	Mid-Miocene cooling and the extinction of tundra in continental Antarctica
	Lewis A.R.; Marchant D.R.; Ashworth A.C.; Hedenäs L.; Hemming S.R.; Johnson J.V.; Leng M.J.; Machlus M.L.; Newton A.E.; Raine J.I.; Willenbring J.K.; Williams M.; Wolfe A.P.
发表日期	2008
ISSN	0027-8424
起始页码	10676
结束页码	10680
卷号	105 期号:31
英文摘要	A major obstacle in understanding the evolution of Cenozoic climate has been the lack of well dated terrestrial evidence from high-latitude, glaciated regions. Here, we report the discovery of exceptionally well preserved fossils of lacustrine and terrestrial organisms from the McMurdo Dry Valleys sector of the Transantarctic Mountains for which we have established a precise radiometric chronology. The fossils, which include diatoms, palynomorphs, mosses, ostracodes, and insects, represent the last vestige of a tundra community that inhabited the mountains before stepped cooling that first brought a full polar climate to Antarctica. Paleoecological analyses, 40Ar/39Ar analyses of associated ash fall, and climate inferences from glaciological modeling together suggest that mean summer temperatures in the region cooled by at least 8°C between 14.07 ± 0.05 Ma and 13.85 ± 0.03 Ma. These results provide novel constraints for the timing and amplitude of middle-Miocene cooling in Antarctica and reveal the ecological legacy of this global climate transition. © 2008 by The National Academy of Sciences of the USA.
英文关键词	Climate change; Diatoms; Dry valleys; Ostracods; Tundra biota
语种	英语
scopus关键词	Antarctica; article; biota; climate change; cooling; extinct species; global climate; Miocene; priority journal; tundra; Animals; Antarctic Regions; Bryophyta; Climate; Diatoms; Ecosystem; Fossils; Geography; Geology; Invertebrates; Bacillariophyta; Bryophyta; Hexapoda; Ostracoda
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/158953
作者单位	Lewis, A.R., Department of Earth Sciences, Boston University, Boston, MA 02215, United States, Byrd Polar Research Center, Ohio State University, Columbus, OH 43210, United States, Department of Geosciences, North Dakota State University, Fargo, ND 58105, United States; Marchant, D.R., Department of Earth Sciences, Boston University, Boston, MA 02215, United States; Ashworth, A.C., Department of Geosciences, North Dakota State University, Fargo, ND 58105, United States; Hedenäs, L., Department of Cryptogamic Botany, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden; Hemming, S.R., Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States; Johnson, J.V., Department of Computer Science, University of Montana, Missoula, MT 59812, United States; Leng, M.J., Natural Environment Research Council Isotope Geosciences Laboratory, Keyworth, Nottingham NG12 5GG, United Kingdom; Machlus, M.L., Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY ...
推荐引用方式 GB/T 7714	Lewis A.R.,Marchant D.R.,Ashworth A.C.,et al. Mid-Miocene cooling and the extinction of tundra in continental Antarctica[J],2008,105(31).
APA	Lewis A.R..,Marchant D.R..,Ashworth A.C..,Hedenäs L..,Hemming S.R..,...&Wolfe A.P..(2008).Mid-Miocene cooling and the extinction of tundra in continental Antarctica.Proceedings of the National Academy of Sciences of the United States of America,105(31).
MLA	Lewis A.R.,et al."Mid-Miocene cooling and the extinction of tundra in continental Antarctica".Proceedings of the National Academy of Sciences of the United States of America 105.31(2008).