气候变化领域集成服务门户(CCPortal): Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene

CCPortal

DOI	10.1073/pnas.1516030113
	Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene
	Levy R.; Harwood D.; Florindo F.; Sangiorgi F.; Tripati R.; von Eynatten H.; Gasson E.; Kuhn G.; Tripati A.; Deconto R.; Fielding C.; Field B.; Golledge N.; McKay R.; Naish T.; Olney M.; Pollard D.; Schouten S.; Talarico F.; Warny S.; Willmott V.; Acton G.; Panter K.; Paulsen T.; Taviani M.; Askin R.; Atkins C.; Bassett K.; Beu A.; Blackstone B.; Browne G.; Ceregato A.; Cody R.; Cornamusini G.; Corrado S.; Del Carlo P.; Di Vincenzo G.; Dunbar G.; Falk C.; Frank T.; Giorgetti G.; Grelle T.; Gui Z.; Handwerger D.; Hannah M.; Harwood D.M.; Hauptvogel D.; Hayden T.; Henrys S.; Hoffmann S.; Iacoviello F.; Ishman S.; Jarrard R.; Johnson K.; Jovane L.; Judge S.; Kominz M.; Konfirst M.; Krissek L.; Lacy L.; Maffioli P.; Magens D.; Marcano M.C.; Millan C.; Mohr B.; Montone P.; Mukasa S.; Niessen F.; Ohneiser C.; Passchier S.; Patterson M.; Pekar S.; Pierdominici S.; Raine I.; Reed J.; Reichelt L.; Riesselman C.; Rocchi S.; Sagnotti L.; Sandroni S.; Schmitt D.; Speece M.; Storey B.; Strada E.; Tuzzi E.; Verosub K.; Wilson G.; Wilson T.; Wonik T.; Zattin M.; SMS Science Team
发表日期	2016
ISSN	0027-8424
起始页码	3453
结束页码	3458
卷号	113 期号:13
英文摘要	Geological records from the Antarctic margin offer direct evidence of environmental variability at high southern latitudes and provide insight regarding ice sheet sensitivity to past climate change. The early to mid-Miocene (23-14 Mya) is a compelling interval to study as global temperatures and atmospheric CO 2 concentrations were similar to those projected for coming centuries. Importantly, this time interval includes the Miocene Climatic Optimum, a period of global warmth during which average surface temperatures were 3-4 °C higher than today. Miocene sediments in the ANDRILL-2A drill core from the Western Ross Sea, Antarctica, indicate that the Antarctic ice sheet (AIS) was highly variable through this key time interval. A multiproxy dataset derived from the core identifies four distinct environmental motifs based on changes in sedimentary facies, fossil assemblages, geochemistry, and paleotemperature. Four major disconformities in the drill core coincide with regional seismic discontinuities and reflect transient expansion of grounded ice across the Ross Sea. They correlate with major positive shifts in benthic oxygen isotope records and generally coincide with intervals when atmospheric CO 2 concentrations were at or below preindustrial levels (∼280 ppm). Five intervals reflect ice sheet minima and air temperatures warm enough for substantial ice mass loss during episodes of high (∼500 ppm) atmospheric CO 2 . These new drill core data and associated ice sheet modeling experiments indicate that polar climate and the AIS were highly sensitive to relatively small changes in atmospheric CO 2 during the early to mid-Miocene.
英文关键词	Antarctica; Climate Optimum; Ice sheet; Miocene; Ross Sea
语种	英语
scopus关键词	carbon dioxide; oxygen; air temperature; Antarctica; arctic climate; Article; atmospheric dispersion; climate change; concentration (parameters); fossil; geochemistry; heat; ice sheet; latitude; Middle Miocene; priority journal; temperature sensitivity
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/158906
作者单位	Levy, R., Department of Paleontology, GNS Science, Lower Hutt, 5040, New Zealand, GNS Science, 1 Fairway Drive, PO Box 30 368, Lower Hutt, New Zealand; Harwood, D., Department of Earth & Atmospheric Sciences, University of Nebraska, Lincoln, NE 68588, United States; Florindo, F., Istituto Nazionale di Geofisica e Vulcanologia, Rome, I-00143, Italy, Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy; Sangiorgi, F., Marine Palynology and Paleoceanography, Laboratory of Palaeobotany and Palynology, Department of Earth Sciences, Utrecht University, Utrecht, 3584 CD, Netherlands, Marine Palynology and Paleoceanography, Laboratory of Palaeobotany and Palynology, Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; Tripati, R., Institute of the Environment and Sustainability, University of California, Los Angeles, CA 90024, United States, Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095, United States; von Eynatten, H., Department of S...
推荐引用方式 GB/T 7714	Levy R.,Harwood D.,Florindo F.,et al. Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene[J],2016,113(13).
APA	Levy R..,Harwood D..,Florindo F..,Sangiorgi F..,Tripati R..,...&SMS Science Team.(2016).Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene.Proceedings of the National Academy of Sciences of the United States of America,113(13).
MLA	Levy R.,et al."Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene".Proceedings of the National Academy of Sciences of the United States of America 113.13(2016).