North Atlantic ocean circulation and abrupt climate change during the last glaciation

被引：296

作者：

Henry, L. G. ^{[1
]}

McManus, J. F. ^{[1
]}

Curry, W. B. ^{[2
,3
]}

Roberts, N. L. ^{[4
]}

Piotrowski, A. M. ^{[4
]}

Keigwin, L. D. ^{[2
]}

机构：

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

[2] Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA

[3] Bermuda Inst Ocean Sci, St Georges, Bermuda

[4] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England

来源：

SCIENCE | 2016年 / 353卷 / 6298期

关键词：

ATMOSPHERIC CO2; DEEP-WATER; OVERTURNING CIRCULATION; HEINRICH EVENTS; VARIABILITY; DELTA-C-13; PATTERNS; COLLAPSE; RISE; FLOW;

D O I：

10.1126/science.aaf5529

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 most recent ice age was characterized by rapid and hemispherically asynchronous climate oscillations, whose origin remains unresolved. Variations in oceanic meridional heat transport may contribute to these repeated climate changes, which were most pronounced during marine isotope stage 3, the glacial interval 25 thousand to 60 thousand years ago. We examined climate and ocean circulation proxies throughout this interval at high resolution in a deep North Atlantic sediment core, combining the kinematic tracer protactinium/thorium (Pa/Th) with the deep water-mass tracer, epibenthic delta C-13. These indicators suggest reduced Atlantic overturning circulation during every cool northern stadial, with the greatest reductions during episodic Hudson Strait iceberg discharges, while sharp northern warming followed reinvigorated overturning. These results provide direct evidence for the ocean's persistent, central role in abrupt glacial climate change.

引用

页码：470 / 474

页数：5

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