globalchange  > 气候变化与战略
DOI: 10.1073/pnas.0802501105
论文题名:
Mid-Miocene cooling and the extinction of tundra in continental Antarctica
作者: 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.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2008
卷: 105, 期:31
起始页码: 10676
结束页码: 10680
语种: 英语
英文关键词: Climate change ; Diatoms ; Dry valleys ; Ostracods ; Tundra biota
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162171
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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 10964, United States; Newton, A.E., Department of Botany, Natural History Museum, London SW7 5BD, United Kingdom; Raine, J.I., GNS Science, Lower Hutt 5040, New Zealand; Willenbring, J.K., Institut für Mineralogie, Leibniz Universität, D-30167 Hannover, Germany; Williams, M., Department of Geology, University of Leicester, Leicester LE1 7RH, United Kingdom; Wolfe, A.P., Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada

Recommended Citation:
Lewis A.R.,Marchant D.R.,Ashworth A.C.,et al. Mid-Miocene cooling and the extinction of tundra in continental Antarctica[J]. Proceedings of the National Academy of Sciences of the United States of America,2008-01-01,105(31)
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