Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/12804
DC Field | Value | Language |
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dc.date.accessioned | 2019-10-16T06:46:44Z | en |
dc.date.available | 2019-10-16T06:46:44Z | en |
dc.date.issued | 2019-02 | en |
dc.identifier.uri | http://hdl.handle.net/2122/12804 | en |
dc.description.abstract | 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. | en |
dc.language.iso | English | en |
dc.relation.ispartof | Nature Geoscience | en |
dc.relation.ispartofseries | 2/12 (2019) | en |
dc.subject | :MIDDLE MIOCENE CLIMATE; SEA-LEVEL; ROSS SEA; HEMISPHERE CLIMATE; CONTINENTAL-SHELF; ODP SITE-1165; PRYDZ BAY; SOUTHERN; INTENSIFICATION; HISTORY | en |
dc.title | Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 132-137 | en |
dc.identifier.doi | 10.1038/s41561-018-0284-4 | en |
dc.description.obiettivoSpecifico | 1A. Geomagnetismo e Paleomagnetismo | en |
dc.description.obiettivoSpecifico | 4A. Oceanografia e clima | en |
dc.description.obiettivoSpecifico | 5A. Ricerche polari e paleoclima | en |
dc.description.journalType | JCR Journal | en |
dc.contributor.author | Levy, Richard H. | en |
dc.contributor.author | Meyers, S. R. | en |
dc.contributor.author | Naish, T. R. | en |
dc.contributor.author | Golledge, Nicholas | en |
dc.contributor.author | McKay, R. M. | en |
dc.contributor.author | Crampton, James S. | en |
dc.contributor.author | DeConto, R. M. | en |
dc.contributor.author | De Santis, L. | en |
dc.contributor.author | Florindo, Fabio | en |
dc.contributor.author | Gasson, Edward G. W. | en |
dc.contributor.author | Harwood, D. M. | en |
dc.contributor.author | Luyendyk, B. P. | en |
dc.contributor.author | Powell, R. D. | en |
dc.contributor.author | Clowes, C. | en |
dc.contributor.author | Kulhanek, Denise | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione AC, Roma, Italia | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand - GNS Sciences, Lower Hutt, New Zealand | - |
crisitem.author.dept | Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington, New Zealand | - |
crisitem.author.dept | Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione AC, Roma, Italia | - |
crisitem.author.dept | Department of Geosciences, University of Nebraska-Lincoln, Lincoln, NE 68588-0340, USA | - |
crisitem.author.dept | Institute of Crustal Studies, University of California, Santa Barbara, California, USA | - |
crisitem.author.dept | Department of Geology & Environmental Geosciences, Northern Illinois University, DeKalb, IL 60115, USA | - |
crisitem.author.orcid | 0000-0001-7676-8970 | - |
crisitem.author.orcid | 0000-0002-5602-6985 | - |
crisitem.author.orcid | 0000-0003-3270-9981 | - |
crisitem.author.orcid | 0000-0003-2800-6466 | - |
crisitem.author.orcid | 0000-0002-7752-7754 | - |
crisitem.author.orcid | 0000-0002-6058-9748 | - |
crisitem.author.orcid | 0000-0003-4653-6217 | - |
crisitem.author.orcid | 0000-0002-2156-6383 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
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Levy_et_al-2019-Nature_Geoscience.pdf | 2.09 MB | Adobe PDF |
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