Obliquity-paced Pliocene West Antarctic ice sheet oscillations

被引：485

作者：

Naish, T. ^{[1
,2
]}

Powell, R. ^{[3
]}

Levy, R. ^{[4
]}

Wilson, G. ^{[5
]}

Scherer, R. ^{[3
]}

Talarico, F. ^{[6
]}

Krissek, L. ^{[7
]}

Niessen, F. ^{[8
]}

Pompilio, M. ^{[9
]}

Wilson, T. ^{[7
]}

Carter, L. ^{[1
]}

DeConto, R. ^{[10
]}

Huybers, P. ^{[11
]}

McKay, R. ^{[1
]}

Pollard, D. ^{[12
]}

Ross, J. ^{[13
]}

Winter, D. ^{[4
]}

Barrett, P. ^{[1
]}

Browne, G. ^{[2
]}

Cody, R. ^{[1
,2
]}

Cowan, E. ^{[14
]}

Crampton, J. ^{[2
]}

Dunbar, G. ^{[1
]}

Dunbar, N. ^{[13
]}

Florindo, F. ^{[15
]}

Gebhardt, C. ^{[8
]}

Graham, I. ^{[2
]}

Hannah, M. ^{[1
]}

Hansaraj, D. ^{[1
,2
]}

Harwood, D.

Helling, D. ^{[8
]}

Henrys, S. ^{[2
]}

Hinnov, L. ^{[16
]}

Kuhn, G. ^{[8
]}

Kyle, P. ^{[13
]}

Laeufer, A. ^{[17
]}

Maffioli, P. ^{[18
]}

Magens, D. ^{[8
]}

Mandernack, K. ^{[19
]}

McIntosh, W. ^{[13
]}

Millan, C. ^{[7
]}

Morin, R. ^{[20
]}

Ohneiser, C. ^{[5
]}

Paulsen, T. ^{[21
]}

Persico, D. ^{[22
]}

Raine, I. ^{[2
]}

Reed, J. ^{[4
,23
]}

Riesselman, C. ^{[24
]}

Sagnotti, L. ^{[15
]}

Schmitt, D. ^{[25
]}

机构：

[1] Victoria Univ Wellington, Antarctic Res Ctr, Wellington 6012, New Zealand

[2] GNS Sci, Lower Hutt 5040, New Zealand

[3] No Illinois Univ, Dept Geog & Environm Geosci, De Kalb, IL 60115 USA

[4] Univ Nebraska, Dept Geosci, ANDRILL Sci Management Off, Lincoln, NE 68588 USA

[5] Univ Otago, Dept Geol, Dunedin 9001, Otago, New Zealand

[6] Univ Siena, Dipartimento Sci Terra, I-53100 Siena, Italy

[7] Ohio State Univ, Dept Geol Sci, Columbus, OH 43210 USA

[8] Alfred Wegener Inst Polar & Marine Res, Inst Geosci, D-27515 Bremerhaven, Germany

[9] Ist Nazl Geofis & Vulcanol, I-56126 Pisa, Italy

[10] Univ Massachusetts, Dept Geosci, Morrell Sci Ctr 233, Amherst, MA 01003 USA

[11] Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA

[12] Penn State Univ, Earth & Environm Syst Inst, University Pk, PA 16802 USA

[13] New Mexico Inst Min & Technol, Socorro, NM 87801 USA

[14] Appalachian State Univ, Dept Geol, Boone, NC 28608 USA

[15] Ist Nazl Geofis & Vulcanol, I-00143 Rome, Italy

[16] Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA

[17] Fed Inst Geosci & Nat Resources, BGR, D-30655 Hannover, Germany

[18] Univ Milano Bicocca, Dipartimento Sci Geol & Geotecnol, I-20126 Milan, Italy

[19] Colorado Sch Mines, Dept Chem & Geochem, Golden, CO 80401 USA

[20] US Geol Survey, Denver, CO 80225 USA

[21] Univ Wisconsin, Dept Geol, Oshkosh, WI 54901 USA

[22] Univ Parma, Dipartimento Sci Terra, I-43100 Parma, Italy

[23] Iowa State Univ, CHRONOS, Dept Geol & Atmospher Sci, Ames, IA 50011 USA

[24] Stanford Univ, Sch Earth Sci, Dept Geol & Environm Sci, Stanford, CA 94305 USA

[25] Univ Alberta, Dept Phys, Edmonton, AB T6G 2G7, Canada

[26] Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA

[27] ISMAR Bologna, CNR, I-40129 Bologna, Italy

[28] Albion Coll, Dept Geol, Albion, MI 49224 USA

[29] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA

来源：

NATURE | 2009年 / 458卷 / 7236期

基金：

美国国家科学基金会;

关键词：

ATLANTIC DEEP-WATER; EUSTATIC SEA-LEVEL; CLIMATE VARIABILITY; ROSS SEA; OCEAN; FLUCTUATIONS; GREENHOUSE; DELTA-O-18; AMPLITUDE; HISTORY;

D O I：

10.1038/nature07867

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Thirty years after oxygen isotope records from microfossils deposited in ocean sediments confirmed the hypothesis that variations in the Earth's orbital geometry control the ice ages(1), fundamental questions remain over the response of the Antarctic ice sheets to orbital cycles(2). Furthermore, an understanding of the behaviour of the marine-based West Antarctic ice sheet (WAIS) during the 'warmer-than-present' early-Pliocene epoch (similar to 5-3 Myr ago) is needed to better constrain the possible range of ice-sheet behaviour in the context of future global warming(3). Here we present a marine glacial record from the upper 600 m of the AND-1B sediment core recovered from beneath the northwest part of the Ross ice shelf by the ANDRILL programme and demonstrate well-dated, similar to 40-kyr cyclic variations in ice-sheet extent linked to cycles in insolation influenced by changes in the Earth's axial tilt (obliquity) during the Pliocene. Our data provide direct evidence for orbitally induced oscillations in the WAIS, which periodically collapsed, resulting in a switch from grounded ice, or ice shelves, to open waters in the Ross embayment when planetary temperatures were up to similar to 3 degrees C warmer than today(4) and atmospheric CO2 concentration was as high as similar to 400 p. p. m. v. (refs 5, 6). The evidence is consistent with a new ice-sheet/ice-shelf model(7) that simulates fluctuations in Antarctic ice volume of up to +7 m in equivalent sea level associated with the loss of the WAIS and up to +3 m in equivalent sea level from the East Antarctic ice sheet, in response to ocean-induced melting paced by obliquity. During interglacial times, diatomaceous sediments indicate high surface-water productivity, minimal summer sea ice and air temperatures above freezing, suggesting an additional influence of surface melt(8) under conditions of elevated CO2.

引用

页码：322 / U84

页数：8

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