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The impact of nonlinear tide-surge interaction on satellite radar altimeter-derived tides

机译：The impact of nonlinear tide-surge interaction on satellite radar altimeter-derived tides

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摘要

Both empirical and assimilative global ocean tidal models are significantly more accurate in the deep ocean than in shelf and coastal waters. In this study, we answered whether this is due to the quality of the models used to reduce tide and surge or the general approach to treat tide and surge as two separate components of the water level obtained from standalone models, which ignores the nonlinear tide-surge interaction. In doing so, we used tide gauge observations as partially synthetic altimeter time series, tide-surge water-level time series obtained with the 2D Dutch Continental Shelf Model - Flexible Mesh (DCSM), and tide and surge water-level time series obtained using the DCSM, FES2014 (FES) and the Dynamic Atmospheric Correction (DAC) product. Expressed in the root-sum-square (RSS) of the eight main tidal constituents, we obtained a reduction ＞ 50 when removing the DCSM tide-surge water levels compared to when we removed the sum of the DCSM tide and DCSM surge water levels. The RSS obtained in the latter case was only 3.3 lower than with FES and DAC. We conclude that the lower tidal estimates accuracy in shelf-coastal waters derives from the missing nonlinear tide-surge interactions.

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  • 来源
    《Marine geodesy》 |2023年第3期|251-270|共20页
  • 作者

    H. Guarneri; M. Verlaan; D. C. SlobbeJ. VeenstraF. ZijlJ. PietrzakM. SnellenL. KeyzerY. AfrastehR. Klees;

  • 作者单位

    Delft Institute of Applied Mathematics, Faculty of Electrical Engineering, Mathematics and Computer Science, Delft University of Technology, Delft, The Netherlands, Environmental Hydrodynamics & Forecasting, Marine and Coastal Systems, Deltares, Delft, Th;

    Department of Geoscience & Remote Sensing, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands;

    Environmental Hydrodynamics & Forecasting, Marine and Coastal Systems, Deltares, Delft, The NetherlandsDepartment of Hydraulic Engineering, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The NetherlandsDepartment of Control and Operations, Faculty of Aerospace Engineering, Delft University of Technology, Delft, The Netherlands;

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  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类
  • 关键词

    Harmonic analysis; satellite radar altimetry; shallow waters; tides; tide-surge interactions; variance reduction;

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