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World ocean tides synthesized from normal modes.

G W Platzman

    Science (New York, N.Y.)
    |May 6, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Oceanic normal modes synthesize lunar tides, with energetic modes dominating M(2) and K(1) tidal energy. Ocean tidal response quality (Q) resembles a frictionally controlled oscillator, with M(2) global Q around 10.

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    North atlantic ocean: preliminary description of normal modes.

    Science (New York, N.Y.)ยท1972
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    Area of Science:

    • Oceanography
    • Geophysics
    • Tidal dynamics

    Background:

    • Tidal forcing is a significant driver of oceanic processes.
    • Understanding the energy distribution within tidal modes is crucial for oceanographic modeling.

    Purpose of the Study:

    • To synthesize the M(2) and K(1) tides using oceanic normal modes.
    • To analyze the energy contribution of different modes to tidal synthesis.
    • To investigate the quality factor (Q) of the ocean's tidal response.

    Main Methods:

    • Utilized sixty oceanic normal modes for tidal synthesis.
    • Analyzed the energy distribution among the most energetic modes for M(2) and K(1) tides.
    • Performed model calculations to determine the ocean response quality (Q).

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    Main Results:

    • The ten most energetic modes accounted for 87% of M(2) tidal energy and 93% of K(1) tidal energy.
    • A single mode with a 29-hour period contributed two-thirds of the K(1) energy.
    • Model calculations revealed the ocean's tidal response quality (Q) is frictionally controlled, with a global Q of approximately 10 for M(2).

    Conclusions:

    • Oceanic normal modes effectively synthesize major tidal components.
    • A few energetic modes dominate tidal energy, simplifying the system's dynamics.
    • The ocean's tidal response is akin to a damped oscillator, characterized by a specific quality factor.