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Deep, zonal subequatorial currents.

L D Talley, G C Johnson

    Science (New York, N.Y.)
    |February 25, 1994
    PubMed
    Summary
    This summary is machine-generated.

    Deep ocean currents reveal large, westward-moving water masses in the Pacific and Atlantic oceans, north and south of the equator. These flows, separated by an eastward current near the equator, suggest broader oceanic forcing mechanisms.

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    Area of Science:

    • Oceanography
    • Deep Ocean Circulation
    • Geophysics

    Background:

    • Large-scale, deep ocean currents are crucial for global heat and nutrient transport.
    • Previous studies suggested localized hydrothermal forcing for deep tropical flows.
    • Understanding deep ocean dynamics is key to climate modeling.

    Purpose of the Study:

    • To investigate the structure and potential forcing mechanisms of deep tropical water masses.
    • To analyze the spatial distribution of warm and cold water tongues in the Pacific and Atlantic.
    • To challenge existing hypotheses on deep ocean current generation.

    Main Methods:

    • Analysis of hydrographic data to identify water mass extents and directions.
    • Mapping of temperature and salinity at depths between 2000 and 3000 meters.

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  • Comparison of observed flow patterns with helium isotope data.

    • Main Results:

    • Identified extensive westward-extending tongues of warm (Pacific) and cold (Atlantic) water.
    • Located these tongues north and south of the equator at specific latitudes in both oceans.
    • Observed a contrasting eastward-extending tongue near the equator, consistent with helium isotope findings.

    Conclusions:

    • Deep tropical westward flows north and south of the equator are significant features.
    • An eastward flow near the equator acts as a separator for these currents.
    • These observed deep ocean circulation patterns may result from more general oceanic forcing than previously assumed.