Atlantic overturning responses to Late Pleistocene climate forcings

Lorraine E. Lisiecki (), Maureen E. Raymo and William B. Curry
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Lorraine E. Lisiecki: Boston University, 675 Commonwealth Avenue, Boston, Massachusetts 02215, USA
Maureen E. Raymo: Boston University, 675 Commonwealth Avenue, Boston, Massachusetts 02215, USA
William B. Curry: Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA

Nature, 2008, vol. 456, issue 7218, 85-88

Abstract: Late Pleistocene climate Variations in the Earth's orbit are known to influence glacial cycles and consequently, global ice volume and the strength of oceanic mixing. Sediment cores from the ocean floor are used to assess orbit–climate interactions and contain a wealth of information on elemental ratios such as Mg/Ca, species assemblages, and in particular, isotopes of carbon (used to approximate nutrient content) and oxygen (indicative of both global ice volume and deep ocean temperature). Established wisdom from the SPECMAP project suggests that the three orbital cycles (precession, obliquity and ellipticity) induce similar changes in climate and ocean circulation. Lisiecki et al. reanalyse sediment cores and suggest a substantially different model for orbit–climate interactions: in the vast mid-depth Atlantic Ocean, peaks in solar radiation are associated with stronger circulation at the obliquity band and weaker circulation at the precession band. These findings could lead to a substantial revision in our understanding of the forcings of glacial cycles and ocean circulation.

Date: 2008
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DOI: 10.1038/nature07425

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