Precessional Forcing of Nutricline Dynamics in the Equatorial Atlantic

DOI Web Site 被引用文献14件
  • B. Molfino
    Lamont-Doherty Geological Observatory of Columbia University, Palisades, NY 10964, and Department of Statistics, Columbia University, New York, NY 10027
  • A. McIntyre
    Lamont-Doherty Geological Observatory of Columbia University, Palisades, NY 10964, and Department of Geology, Qucens College of the City University of New York, Flushing, NY 11357

書誌事項

公開日
1990-08-17
DOI
  • 10.1126/science.249.4970.766
公開者
American Association for the Advancement of Science (AAAS)

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説明

<jats:p> Climate control of nutricline depth in the equatorial Atlantic can be monitored by variations in the abundance of the phytoplankton species <jats:italic>Florisphaera profunda</jats:italic> . A conceptual model, based on in situ evidence, associates high abundances of <jats:italic>F. profunda</jats:italic> with a deep nutricline and low abundances with a shallow nutricline. A 200,000-year record of <jats:italic>F. profunda</jats:italic> relative abundances, obtained from a deep-sea core sited beneath the region of maximum equatorial divergence at 10°W, has 52 percent of its variance centered on the 23,000-year precessional band. Cross-spectral analysis between the signals of <jats:italic>F. profunda</jats:italic> and sea-surface temperature, independently derived from zooplankton species, shows their 23,000-year cycles to be coherent and nearly in phase. Abundance minima of <jats:italic>F. profunda</jats:italic> coincide with times of December perihelion, whereas abundance maxima coincide with June perihelion. These relations indicate that nutricline dynamics in the divergence region of the equatorial Atlantic are controlled by variations in the tropical easterlies, forced by the precessional component of orbital insolation, on time scales greater than 10,000 years. </jats:p>

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  • Science

    Science 249 (4970), 766-769, 1990-08-17

    American Association for the Advancement of Science (AAAS)

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