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Ocean Tides for and from TOPEX/POSEIDON.

C Le Provost, A F Bennett, D E Cartwright

    Science (New York, N.Y.)
    |February 3, 1995
    PubMed
    Summary
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    The TOPEX/POSEIDON mission significantly improved ocean tide models. Altimetric data enhanced accuracy by 30% for the M(2) lunar tide component, reaching practical accuracy limits.

    Area of Science:

    • Oceanography
    • Geophysics
    • Satellite Altimetry

    Background:

    • Accurate ocean tide models are crucial for understanding sea-level variations and ocean dynamics.
    • Previous tide models had limitations in accuracy and global coverage.

    Purpose of the Study:

    • To assess the accuracy of tidal solutions derived from the TOPEX/POSEIDON mission's first year of data.
    • To compare these new solutions with existing models and in situ measurements.

    Main Methods:

    • Utilized data from the first year of the TOPEX/POSEIDON satellite altimetry mission.
    • Compared derived tidal solutions with established ocean tide models.
    • Validated results against a global dataset of 78 in situ tidal stations.

    Main Results:

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    • Demonstrated substantial improvements in tidal solutions compared to previous models.
    • Achieved a 30% increase in accuracy for the major lunar tidal component (M2) based on root-mean-square differences.
    • Highlighted the high quality of TOPEX/POSEIDON altimetric data as the primary driver of improvement.

    Conclusions:

    • TOPEX/POSEIDON data represents a major advancement in ocean tide modeling.
    • Assimilation of altimetric data with numerical models approaches the limits of practical accuracy for tidal solutions.