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Sen Jan 1 , Yu-Heng Tseng 2 , Chih-Kai Hu 1 , Chao-Tsung Chiu 1 and Shao-Hua Chen 1

Development of a Multi-scale Taiwan Community Ocean Model. Sen Jan 1 , Yu-Heng Tseng 2 , Chih-Kai Hu 1 , Chao-Tsung Chiu 1 and Shao-Hua Chen 1 1 Institute of Hydrological and Oceanic Sciences National Central University 2 Department of Atmospheric Science National Taiwan University

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Sen Jan 1 , Yu-Heng Tseng 2 , Chih-Kai Hu 1 , Chao-Tsung Chiu 1 and Shao-Hua Chen 1

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  1. Development of a Multi-scale Taiwan Community Ocean Model Sen Jan1, Yu-Heng Tseng2, Chih-Kai Hu1, Chao-Tsung Chiu1 and Shao-Hua Chen1 1Institute of Hydrological and Oceanic Sciences National Central University 2Department of Atmospheric Science National Taiwan University Sponsored by National Science Council Taiwan Ocean Research Institute, NARL

  2. Background • Taiwan is located along the southeast Coast of the Asian continent, across the • Taiwan Strait from the mainland China. It acts as the pivot on the west edge of the • Pacific Ocean. • The development of a community ocean model is vital to the interdisciplinary • oceanographic studies.

  3. Overview • The project will develop a three-dimensional, multi- • scale, community ocean model. • The development ranges from tide (wave) models to • basin-scale circulation models. • The model domains cover the entire North Pacific • Ocean with 1/4° horizontal grid resolution and down • to the surrounding seas of Taiwan with 1/128° • resolution. • The ultimate goal aims to build a public-released • oceanic model and enhance Taiwan's ocean • nowcasting/forecasting ability.

  4. Major tasks • Year 1 • Establishing computing facilities, manpower and observational database. • Developing the prototypes of 3-D, 1/12°, 51 s-layer tide and 1/4°, 26 z-levels North Pacific circulation models independently • Conducting the required observations including tidal sea level measurement and drifter observation for the model validations. • Year 2 • Performing further model development to improve the accuracy and resolution. • Offering the model products online and improving the model dynamic along with the development. The associated drifting trajectory and contaminant dispersion modules will be incorporated to the system. The circulation and tide models and associated results will be introduced individually below.

  5. Definition What is a “community ocean model” Step 1. Download Model code + + forcings + etc. freely! Step 2. Add + + + River runoff + NO3- , PO43- … + Typhoon on your own. Step 2. Store for your own applications. (u, v, w, h, p, T, S, NO3- , PO43- …)

  6. North Pacific Ocean model ETOPO2 NCOR-1’ * Revised from DieCAST (Dietrich, 1997) * Rigid-lid, hydrostatic, and Buossinesq approximations * Advection and horizontal pressure terms are 4th-order- accurate * Horizontal viscosity/diffusivity are only 200 m2/s * Non-staggered "A" grid * 1/4o horizontal grid resolution and 26 vertical z-levels with various level thickness

  7. Preliminary result surface current speed at day 0 of year 54 Early results show realistic: Kuroshio intrusion and retreat through Luzon Strait and over southern East China Sea; formation of a warm core eddy in northern South China Sea in winter; seasonal variation of circulation in Taiwan Strait; and big Kuroshio meander over Izu Ridge southeast of Japan.

  8. Ongoing researches Physical-biogeochemical coulpled modeling (Liu et al.) Kuroshio in the Luzon Strait (Tseng et al.) Upper ocean response to Typhoon Kaitek (Tseng et al.) Sources of water in the Taiwan Strait (Jan et al.) Summer (Lin et al, 2003)

  9. 3D baroclinic tide model Model domain A database of high-accurate harmonic constants in seas around Taiwan * Revised from POM * Free surface * Hydrostatic, and Buossinesq approximation * Smogorinsky horizontal viscosity/ diffusivity * 1/12o horizontal grid resolution and 51 vertical s-layers

  10. Validation Tidal sea level at Lanyu (an isle southeast of Taiwan) Observation vs. simulation (O1+P1+K1+N2+M2+S2) This accuracy is beyond that of NAO.99a Observation (O1+P1+K1+N2+M2+S2)vs. simulation (O1+P1+K1+N2+M2+S2)

  11. Ongoing researches Internal tides in the sea off northeastern Taiwan (Jan, Lien and Tseng) Internal tides in the Luzon Strait (Jan and Lien)

  12. Ongoing researches High-resolution (1’ grid) simulation of 3D baroclinic tides off northeastern Taiwan Model domain Energetics Boundary conditions were retrieved from our 1/12o tide model

  13. Webpage for TaiCOM http://140.112.65.21/taicom

  14. Applications 1o/12 harmonic constants (O1 P1 K1 N2 M2 S2Q1 M1 J1 OO1 2N2 Mu2 Nu2 L2 T2 K2) Along-track tidal sea level and current Calculation of tidal sea level and current Calculation of trajectory

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