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DOI | 10.1038/s41561-018-0284-4 |
Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections | |
Levy, R. H.1,2; Meyers, S. R.3; Naish, T. R.2; Golledge, N. R.1,2; McKay, R. M.2; Crampton, J. S.1,4; DeConto, R. M.5; De Santis, L.6; Florindo, F.7; Gasson, E. G. W.8; Harwood, D. M.9; Luyendyk, B. P.10; Powell, R. D.11; Clowes, C.1; Kulhanek, D. K.12 | |
2019-02-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2019 |
卷号 | 12期号:2页码:132-+ |
文章类型 | Article |
语种 | 英语 |
国家 | New Zealand; USA; Italy; England |
英文摘要 | Deep sea geological records indicate that Antarctic ice-sheet growth and decay is strongly influenced by the Earth's astronomical variations (known as Milankovitch cycles), and that the frequency of the glacial-interglacial cycles changes through time. Here we examine the emergence of a strong obliquity (axial tilt) control on Antarctic ice-sheet evolution during the Miocene by correlating the Antarctic margin geological records from 34 to 5 million years ago with a measure of obliquity sensitivity that compares the variance in deep sea sediment core oxygen-isotope data at obliquity timescales with variance of the calculated obliquity forcing. Our analysis reveals distinct phases of ice-sheet evolution and suggests the sensitivity to obliquity forcing increases when ice-sheet margins extend into marine environments. We propose that this occurs because obliquity-driven changes in the meridional temperature gradient affect the position and strength of the circum-Antarctic easterly flow and enhance (or reduce) ocean heat transport across the Antarctic continental margin. The influence of obliquity-driven changes in ocean dynamics is amplified when marine ice sheets are extensive, and sea ice is limited. Our reconstruction of the Antarctic ice-sheet history suggests that if sea-ice cover decreases in the coming decades, ocean-driven melting at the ice-sheet margin will be amplified. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000457194900013 |
WOS关键词 | MIDDLE MIOCENE CLIMATE ; SEA-LEVEL ; ROSS SEA ; HEMISPHERE CLIMATE ; CONTINENTAL-SHELF ; ODP SITE-1165 ; PRYDZ BAY ; SOUTHERN ; INTENSIFICATION ; HISTORY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34994 |
专题 | 地球科学 气候变化 |
作者单位 | 1.GNS Sci, Lower Hutt, New Zealand; 2.Victoria Univ Wellington, Antarctic Res Ctr, Wellington, New Zealand; 3.Univ Wisconsin, Dept Geosci, Madison, WI USA; 4.Victoria Univ Wellington, Sch Geog Environm & Earth Sci, Wellington, New Zealand; 5.Univ Massachusetts, Dept Geosci, Amherst, MA 01003 USA; 6.Ist Nazl Oceanog & Geofis Sperimentale OGS, Trieste, Italy; 7.INGV, Rome, Italy; 8.Univ Bristol, Sch Geog Sci, Bristol, Avon, England; 9.Univ Nebraska, Earth & Atmospher Sci, Lincoln, NE USA; 10.Univ Calif Santa Barbara, Earth Sci Dept, Santa Barbara, CA 93106 USA; 11.Northern Illinois Univ, Dept Geol & Environm Geosci, De Kalb, IL USA; 12.Texas A&M Univ, Int Ocean Discovery Program, College Stn, TX USA |
推荐引用方式 GB/T 7714 | Levy, R. H.,Meyers, S. R.,Naish, T. R.,et al. Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections[J]. NATURE GEOSCIENCE,2019,12(2):132-+. |
APA | Levy, R. H..,Meyers, S. R..,Naish, T. R..,Golledge, N. R..,McKay, R. M..,...&Kulhanek, D. K..(2019).Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections.NATURE GEOSCIENCE,12(2),132-+. |
MLA | Levy, R. H.,et al."Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections".NATURE GEOSCIENCE 12.2(2019):132-+. |
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