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Proc Natl Acad Sci U S A. 2014 Aug 5;111(31):11263-8. doi: 10.1073/pnas.1322103111. Epub 2014 Jul 21.

Oceanographic dynamics and the end of the last interglacial in the subpolar North Atlantic.

Author information

1
Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964; and mokeddem@ldeo.columbia.edu.
2
Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964; and.
3
Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543.

Abstract

The last interglacial interval was terminated by the inception of a long, progressive glaciation that is attributed to astronomically influenced changes in the seasonal distribution of sunlight over the earth. However, the feedbacks, internal dynamics, and global teleconnections associated with declining northern summer insolation remain incompletely understood. Here we show that a crucial early step in glacial inception involves the weakening of the subpolar gyre (SPG) circulation of the North Atlantic Ocean. Detailed new records of microfossil foraminifera abundance and stable isotope ratios in deep sea sediments from Ocean Drilling Program site 984 south of Iceland reveal repeated, progressive cold water-mass expansions into subpolar latitudes during the last peak interglacial interval, marine isotope substage 5e. These movements are expressed as a sequence of progressively extensive southward advances and subsequent retreats of a hydrographic boundary that may have been analogous to the modern Arctic front, and associated with rapid changes in the strength of the SPG. This persistent millennial-scale oceanographic oscillation accompanied a long-term cooling trend at a time of slowly declining northern summer insolation, providing an early link in the propagation of those insolation changes globally, and resulting in a rapid transition from extensive regional warmth to the dramatic instability of the subsequent ∼ 100 ka.

KEYWORDS:

cold anomalies; frontal zone; gyre systems; ocean circulation

PMID:
25049405
PMCID:
PMC4128163
DOI:
10.1073/pnas.1322103111
[Indexed for MEDLINE]
Free PMC Article

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