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Coastal Tide Modeling Using Multiple Satellite Altimetry

Yu Wang, C. K. Shum , Yuchan Yi, Ohio State Univ. Koji Matsumoto, National Astronomical Obs., Japan Yoshihiro Niwa, University of Tokyo Yi Chao, Xiaochun Wang, NASA/JPL Venice, 13–18 March 2006. Coastal Tide Modeling Using Multiple Satellite Altimetry.

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Coastal Tide Modeling Using Multiple Satellite Altimetry

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  1. Yu Wang, C. K. Shum, Yuchan Yi, Ohio State Univ.Koji Matsumoto, National Astronomical Obs., JapanYoshihiro Niwa, University of Tokyo Yi Chao, Xiaochun Wang, NASA/JPLVenice, 13–18 March 2006 Coastal Tide Modeling Using Multiple Satellite Altimetry

  2. Coastal Tide Modeling Using Multiple Satellite Altimetry • • Tides are still largely unknown in coastal and polar regions • Approach: empirical solutions using multiple satellite altimetry (T/P, JASON, GFO, ENVISAT) to improve spatial resolution and reduce tidal aliasing (not shown), followed by assimilated (hydrodynamic) tide modeling • T/P cycles 4-364, 369-479; JASON cycles 1-135; GFO, cycles 37-140; ENVISAT cycles 10-38 • Preliminary solutions & evaluations in the Yellow Sea and NW Pacific regions (comparing with JPL ROM derived tides)

  3. TOPEX tracks (black line) and multiple satellite data points (T/P, JASON, ENVISAT, GFO; red) at Yellow Sea (top) and NW Pacific regions (right)

  4. Empirical Tide Modeling in Yellow Sea • Performance of recent global models 8 major constituent RSS differences (left: FES04 & GOT; middle: TPXO06 & GOT00; right: TPXO06 & FES04)

  5. Empirical tide modeling in the Northwest Pacific The amplitude of 4 major tides using T/P crossovers

  6. Empirical tide modeling in the Northwest Pacific The amplitude of 4 major tides usiing ERS-2 crossovers

  7. Empirical tide modeling in the Northwest Pacific The amplitude of 4 major tides using ERS-2 and TOPEX dual-satellite crossovers

  8. Empirical Tide Modeling in the Yellow Sea M2 K1 1/40x1/40

  9. Assimilated (Preliminary) Tide Modeling in Yellow Sea M2 K1 Multiple altimetry data used, no tide gauge data used

  10. M2 vector differences (L: FES2004, M: GOT00.2, R: TPXO.6.2) K1 vector differences (L: FES2004, M: GOT00.2, R: TPXO.6.2)

  11. RMS summary for 8 tides (vector RMS, unit:cm)

  12. Empirical Tide Modeling in the Yellow Sea • Comparison with coastal tide gauges M2 K1

  13. Empirical Tide Modeling in the Yellow Sea • Tide gauge evaluations (vector RMS difference, cm) Edit criteria = 50 cm Edit criteria = 25 cm Only 1 tide gauge used (37.5N, 122.167E)

  14. Northwest Pacific: M2 Empirical Solution ROMS (X. Wang & Y. Chao)

  15. Northwest Pacific: K1 Empirical Solution ROMS (X. Wang & Y. Chao)

  16. Comparison of Empirical Solution with ROMS Model M2 K1

  17. Comparison of Empirical Solution with ROMS Model • RMS summary for 8 major tides (cm)

  18. CONCLUSION • Altimetry data from 4 satellites are used in the empirical tide modeling, which gives a better spatial resolution than using TOPEX data only. • The empirical solution for the Yellow Sea area using multiple satellite altimetry data is comparable with most recent global models, with the best consistency with GOT00 model • Tide gauge evaluations of the Yellow Sea empirical and the assimilated solutions and other models are inconclusive because of lack of tide gauges • Multi-satellite empirical tide solution compares well with tide solution from the fine-resolution JPL ROMS in the NW Pacific

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