globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1615440114
论文题名:
Evolution of the early Antarctic ice ages
作者: Liebrand D.; De Bakker A.T.M.; Beddow H.M.; Wilson P.A.; Bohaty S.M.; Ruessink G.; Pälike H.; Batenburg S.J.; Hilgen F.J.; Hodell D.A.; Huck C.E.; Kroon D.; Raffi I.; Saes M.J.M.; Van Dijk A.E.; Lourens L.J.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2017
卷: 114, 期:15
起始页码: 3867
结束页码: 3872
语种: 英语
英文关键词: Bispectral analysis ; Early Antarctic ice sheet ; Glacial−interglacial cycle geometries ; Oligocene−Miocene ; Unipolar icehouse
Scopus关键词: oxygen ; Article ; Atlantic Ocean ; atmosphere ; controlled study ; deep sea ; evolution ; glacial period ; ice age ; ice sheet ; interglacial ; Miocene ; Oligocene ; oscillation ; polar ice cap ; priority journal ; temperature ; volume
英文摘要: Understanding the stability of the early Antarctic ice cap in the geological past is of societal interest because present-day atmospheric CO2 concentrations have reached values comparable to those estimated for the Oligocene and the Early Miocene epochs. Here we analyze a new high-resolution deep-sea oxygen isotope (δ18O) record from the South Atlantic Ocean spanning an interval between 30.1 My and 17.1 My ago. The record displays major oscillations in deep-sea temperature and Antarctic ice volume in response to the ∼110-ky eccentricity modulation of precession. Conservative minimum ice volume estimates show that waxing and waning of at least ∼85 to 110% of the volume of the present East Antarctic Ice Sheet is required to explain many of the ∼110-ky cycles. Antarctic ice sheets were typically largest during repeated glacial cycles of the mid-Oligocene (∼28.0 My to ∼26.3 My ago) and across the Oligocene−Miocene Transition (∼23.0 My ago). However, the high-amplitude glacial−interglacial cycles of the mid-Oligocene are highly symmetrical, indicating a more direct response to eccentricity modulation of precession than their Early Miocene counterparts, which are distinctly asymmetrical—indicative of prolonged ice buildup and delayed, but rapid, glacial terminations. We hypothesize that the long-term transition to a warmer climate state with sawtooth-shaped glacial cycles in the Early Miocene was brought about by subsidence and glacial erosion in West Antarctica during the Late Oligocene and/or a change in the variability of atmospheric CO2 levels on astronomical time scales that is not yet captured in existing proxy reconstructions. © 2017, 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/162115
Appears in Collections:气候变化与战略

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作者单位: Liebrand, D., National Oceanography Centre Southampton, University of Southampton, Southampton, SO14 3ZH, United Kingdom; De Bakker, A.T.M., Department of Physical Geography, Faculty of Geosciences, Utrecht University, Utrecht, 3508 TC, Netherlands, Littoral Environnement et Sociétés, Université de La Rochelle, La Rochelle, 17042, France; Beddow, H.M., Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, 3584 CD, Netherlands; Wilson, P.A., National Oceanography Centre Southampton, University of Southampton, Southampton, SO14 3ZH, United Kingdom; Bohaty, S.M., National Oceanography Centre Southampton, University of Southampton, Southampton, SO14 3ZH, United Kingdom; Ruessink, G., Department of Physical Geography, Faculty of Geosciences, Utrecht University, Utrecht, 3508 TC, Netherlands; Pälike, H., Center for Marine Environmental Sciences, University of Bremen, Bremen, 28359, Germany; Batenburg, S.J., Institute of Geosciences, Goethe-University Frankfurt am Main, Frankfurt, 60438, Germany, Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom; Hilgen, F.J., Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, 3584 CD, Netherlands; Hodell, D.A., Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, United Kingdom; Huck, C.E., National Oceanography Centre Southampton, University of Southampton, Southampton, SO14 3ZH, United Kingdom; Kroon, D., School of GeoSciences, Grant Institute, University of Edinburgh, Edinburgh, EH9 3FE, United Kingdom; Raffi, I., Dipartimento di Ingegneria e Geologia, Università degli Studi G. d’Annunzio di Chieti–Pescara, Chieti Scalo, 66013, Italy; Saes, M.J.M., Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, 3584 CD, Netherlands; Van Dijk, A.E., Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, 3584 CD, Netherlands; Lourens, L.J., Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, 3584 CD, Netherlands

Recommended Citation:
Liebrand D.,De Bakker A.T.M.,Beddow H.M.,et al. Evolution of the early Antarctic ice ages[J]. Proceedings of the National Academy of Sciences of the United States of America,2017-01-01,114(15)
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