Millennial-Scale Instability of the Antarctic Ice Sheet During the Last Glaciation-Reference-Cited by-同舟云学术

Millennial-Scale Instability of the Antarctic Ice Sheet During the Last Glaciation

Published:2000-06-09 Issue:5472 Volume:288 Page:1815-1819
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Kanfoush Sharon L.¹,Hodell David A.¹,Charles Christopher D.²,Guilderson Thomas P.³,Mortyn P. Graham²,Ninnemann Ulysses S.²

Affiliation:

1. Department of Geological Sciences, University of Florida, Gainesville, FL 32611, USA.

2. Scripps Institution of Oceanography, University of California, San Diego, CA 92093, USA.

3. Lawrence Livermore National Laboratory, Livermore, CA 94550, USA, and Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA.

Abstract

Records of ice-rafted detritus (IRD) concentration in deep-sea cores from the southeast Atlantic Ocean reveal millennial-scale pulses of IRD delivery between 20,000 and 74,000 years ago. Prominent IRD layers correlate across the Polar Frontal Zone, suggesting episodes of Antarctic Ice Sheet instability. Carbon isotopes (δ 13 C) of benthic foraminifers, a proxy of deepwater circulation, reveal that South Atlantic IRD events coincided with strong increases in North Atlantic Deep Water (NADW) production and inferred warming (interstadials) in the high-latitude North Atlantic. Sea level rise or increased NADW production associated with strong interstadials may have resulted in destabilization of grounded ice shelves and possible surging in the Weddell Sea region of West Antarctica.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference50 articles.

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