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Eddy-Resolving Simulations for the Asian Marginal Seas Using ROMS

Eddy-Resolving Simulations for the Asian Marginal Seas Using ROMS. Tony Song JPL, California Institute of Technology Tao Tang Hong Kong Baptist University. 100°E. 120°E. 140°E. Sea of Japan. 40°N. Characteristics: Complex geometry Sleep topography Monsoon winds Strong currents.

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Eddy-Resolving Simulations for the Asian Marginal Seas Using ROMS

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  1. Eddy-Resolving Simulations for the Asian Marginal Seas Using ROMS Tony SongJPL, California Institute of Technology Tao TangHong Kong Baptist University

  2. 100°E 120°E 140°E Sea of Japan 40°N • Characteristics: • Complex geometry • Sleep topography • Monsoon winds • Strong currents ASIA East China Sea 30°N KC PACIFIC 20°N South China Sea NEC • Importance: • Water Exchange • Indonesian throughflow • Warm pool & El Nino 10°N MC Celebes Sea NECC EQ Flores Sea 10°S

  3. Observations: A detached warm eddy from Kuroshio was observed near the Luzon Strait (Li et al. 1998). warm ring center Aug. 1994

  4. Previous Studies • Fang, G. H. (1995): The structure of the Taiwan-Tsushima-Trugaru Current System and its relation to the Kuroshio. Marine Sciences. 4, 43-48. • Hsueh, Y., J. R. Schults, and W. R. Holland (1997): The Kuroshio flow-through in the East China Sea: A numerical model, Prog. Oceanog. 39, 79-108. • Pohlmann, T. (1987): A three-dimensional circulation model of the South China Sea, in Three-Dimensional Models of Marine and Estuarine Dynamics, edited by J.C.J. Nihoul and B.M. Jamart, pp. 245-268, Elsevier, New York • Metzger, E. J. and H. E. Hurlburt (1996): Coupled dynamics of the South China Sea, the Sulu Sea, and the Pacific Ocean, J. Geophys. Res.101, 12331-12352.

  5. Model Description • The model uses curvilinear grid with a variable resolution from 10x10 km for the complex geometry of the Asian marginal seas and 30x30 km grid for the eastern Pacific. • Initialized with Levitus T and S; forced by the monthly mean air-sea fluxes of momentum, heat, and freshwater from COADS. • Closed in the north and west, open in the south and east by combining the radiation scheme with nudging technique (Marchesielo et al. 2001)

  6. The challenge is the topographic representation from shallow (e.g. ECS, 60 m) to deep region (Pacific, 5 km) without losing the resolution in the surface layer. • Z = (1+s) + hs + (H-h)c(s), the s-coordinate (Song&Haidvogel 1994) shallow deep 10m h 5000m

  7. Model Results • Surface layer circulation • Deep layer circulation • Vertical structure • Water exchanges between AMS and Pacific

  8. Tsushima Current Kuroshio eddy Mindanao Current Cyclonic circulation

  9. Weak TSWC Strong Kuroshio intrusion cyclones

  10. To SCS Deep Western Boundary Current To Selebes

  11. Kuroshio warm rings Cold and fresh

  12. Vertical Structure Upwelling Downwelling Luzon Strait Selebes Sea

  13. Conclusions and Discussion • High-resolution and low-viscosity are key factors for a better representation of the exchange of waters through narrow straits and passages. • The detached eddies near the Luzon Strait play a role in transporting warm and salty water into the SCS, while the cyclonic circulation in the Celebes Sea play a role in contributing cold water to the throughflow. • The WDBC of the Pacific Ocean is found to provide fresher waters to the SCS and the Celebes Sea. • However, it is not clear how much they contribute to the water mass of the SCS water and the throughflow. Future study will focus on model-data comparisons.

  14. Dinner Time

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