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Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections

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Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections. / Levy, Richard H.; Meyers, Stephen; Naish, Timothy R.; Golledge, Nicholas R.; McKay, Robert M.; Crampton, James S.; DeConto, R; De Santis, Laura; Florindo, Fabio; Gasson, Ed; Harwood, David; Luyendyk, B. P.; Powell, R; Clowes, C; Kulhanek, Denise K.

In: Nature Geoscience, Vol. 12, No. 2, 14.01.2019, p. 132-137.

Research output: Contribution to journalArticle

Harvard

Levy, RH, Meyers, S, Naish, TR, Golledge, NR, McKay, RM, Crampton, JS, DeConto, R, De Santis, L, Florindo, F, Gasson, E, Harwood, D, Luyendyk, BP, Powell, R, Clowes, C & Kulhanek, DK 2019, 'Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections' Nature Geoscience, vol. 12, no. 2, pp. 132-137. https://doi.org/10.1038/s41561-018-0284-4, https://doi.org/10.1038/s41561-018-0284-4

APA

Levy, R. H., Meyers, S., Naish, T. R., Golledge, N. R., McKay, R. M., Crampton, J. S., ... Kulhanek, D. K. (2019). Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections. Nature Geoscience, 12(2), 132-137. https://doi.org/10.1038/s41561-018-0284-4, https://doi.org/10.1038/s41561-018-0284-4

Vancouver

Levy RH, Meyers S, Naish TR, Golledge NR, McKay RM, Crampton JS et al. Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections. Nature Geoscience. 2019 Jan 14;12(2):132-137. https://doi.org/10.1038/s41561-018-0284-4, https://doi.org/10.1038/s41561-018-0284-4

Author

Levy, Richard H. ; Meyers, Stephen ; Naish, Timothy R. ; Golledge, Nicholas R. ; McKay, Robert M. ; Crampton, James S. ; DeConto, R ; De Santis, Laura ; Florindo, Fabio ; Gasson, Ed ; Harwood, David ; Luyendyk, B. P. ; Powell, R ; Clowes, C ; Kulhanek, Denise K. / Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections. In: Nature Geoscience. 2019 ; Vol. 12, No. 2. pp. 132-137.

Bibtex

@article{5e517cd66687459db87ecd6ab8c8296f,
title = "Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections",
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.",
author = "Levy, {Richard H.} and Stephen Meyers and Naish, {Timothy R.} and Golledge, {Nicholas R.} and McKay, {Robert M.} and Crampton, {James S.} and R DeConto and {De Santis}, Laura and Fabio Florindo and Ed Gasson and David Harwood and Luyendyk, {B. P.} and R Powell and C Clowes and Kulhanek, {Denise K.}",
year = "2019",
month = "1",
day = "14",
doi = "10.1038/s41561-018-0284-4",
language = "English",
volume = "12",
pages = "132--137",
journal = "Nature Geoscience",
issn = "1752-0894",
publisher = "Springer Nature",
number = "2",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections

AU - Levy, Richard H.

AU - Meyers, Stephen

AU - Naish, Timothy R.

AU - Golledge, Nicholas R.

AU - McKay, Robert M.

AU - Crampton, James S.

AU - DeConto, R

AU - De Santis, Laura

AU - Florindo, Fabio

AU - Gasson, Ed

AU - Harwood, David

AU - Luyendyk, B. P.

AU - Powell, R

AU - Clowes, C

AU - Kulhanek, Denise K.

PY - 2019/1/14

Y1 - 2019/1/14

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85060110797&partnerID=8YFLogxK

U2 - 10.1038/s41561-018-0284-4

DO - 10.1038/s41561-018-0284-4

M3 - Article

VL - 12

SP - 132

EP - 137

JO - Nature Geoscience

T2 - Nature Geoscience

JF - Nature Geoscience

SN - 1752-0894

IS - 2

ER -