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Science 13 December 1996:
Vol. 274. no. 5294, pp. 1867 - 1870
DOI: 10.1126/science.274.5294.1867
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Reports

Forcing of Atlantic Equatorial and Subpolar Millennial Cycles by Precession

Andrew McIntyre * and Barbara Molfino dagger

Abundance cycles of the marine alga Florisphaera profunda centered on a period of 7600 carbon-14 years (8400 calendar years) are present in high-resolution records from the equatorial Atlantic spanning 0 to 45,000 years ago. These cycles correlate with Heinrich events 1 through 5, which document rapid changes in continental ice melting around the subpolar North Atlantic. These variations in F. profunda are a direct response to modulation in zonal wind-driven divergence produced by a precessional component of orbital variation during a time of reduced eccentricity modulation.

Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.
*   To whom correspondence should be addressed.

dagger    Present address: Central Intelligence Agency, Washington, DC 20505, USA.

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