Antarctic and Southern Ocean influences on Late Pliocene global cooling

被引：168

作者：

McKay, Robert ^{[1
]}

Naish, Tim ^{[1
]}

Carter, Lionel ^{[1
]}

Riesselman, Christina ^{[2
]}

Dunbar, Robert ^{[3
]}

Sjunneskog, Charlotte ^{[4
]}

Winter, Diane ^{[5
]}

Sangiorgi, Francesca ^{[6
]}

Warren, Courtney ^{[7
]}

Pagani, Mark ^{[7
]}

Schouten, Stefan ^{[8
]}

Willmott, Veronica ^{[8
]}

Levy, Richard ^{[9
]}

DeConto, Robert ^{[10
]}

Powell, Ross D. ^{[11
]}

机构：

[1] Victoria Univ Wellington, Antarctic Res Ctr, Wellington 6140, New Zealand

[2] Stanford Univ, Dept Geog & Environm Sci, Stanford, CA 94305 USA

[3] Stanford Univ, Dept Environm Earth Syst Sci, Stanford, CA 94305 USA

[4] Florida State Univ, Antarctic Marine Geol Res Facil, Tallahassee, FL 32306 USA

[5] Rhithron Associates Inc, Missoula, MT 59804 USA

[6] Univ Utrecht, Lab Palaeobot & Palynol, Fac Geosci, Dept Earth Sci, NL-U3584 CD Utrecht, Netherlands

[7] Yale Univ, Dept Geol & Geophys, New Haven, CT 06520 USA

[8] NIOZ Royal Netherlands Inst Sea Res, Dept Marine Organ Biogeochem, NL-1790 AB Den Burg, Netherlands

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

[10] Univ Massachusetts, Dept Geosci, Amherst, MA 01003 USA

[11] No Illinois Univ, Dept Geol & Environm Geosci, De Kalb, IL 60115 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2012年 / 109卷 / 17期

基金：

美国国家科学基金会;

关键词：

glacial history; West Antarctic Ice Sheet; Late Neogene; paleooceanography; paleoclimate; MAJOR DIATOM TAXA; ICE-SHEET EXPANSION; ROSS SEA; TROPICAL PACIFIC; WEST; BIOGEOGRAPHY; GLACIATION; SEDIMENTS; ATLANTIC; RECORD;

D O I：

10.1073/pnas.1112248109

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：

The influence of Antarctica and the Southern Ocean on Late Pliocene global climate reconstructions has remained ambiguous due to a lack of well-dated Antarctic-proximal, paleoenvironmental records. Here we present ice sheet, sea-surface temperature, and sea ice reconstructions from the ANDRILL AND-1B sediment core recovered from beneath the Ross Ice Shelf. We provide evidence for a major expansion of an ice sheet in the Ross Sea that began at similar to 3.3 Ma, followed by a coastal sea surface temperature cooling of similar to 2.5 degrees C, a stepwise expansion of sea ice, and polynya-style deep mixing in the Ross Sea between 3.3 and 2.5 Ma. The intensification of Antarctic cooling resulted in strengthened westerly winds and invigorated ocean circulation. The associated northward migration of Southern Ocean fronts has been linked with reduced Atlantic Meridional Overturning Circulation by restricting surface water connectivity between the ocean basins, with implications for heat transport to the high latitudes of the North Atlantic. While our results do not exclude low-latitude mechanisms as drivers for Pliocene cooling, they indicate an additional role played by southern high-latitude cooling during development of the bipolar world.

引用

页码：6423 / 6428

页数：6

共 74 条

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