K. Hirai

K. Watanabe

R. Horiuchi

National Institute for Fusion Science (NIFS-Repository)

§S6. Development of Non-Hydrostatic Ocean Circulation Simulation Code Hirai, K. (Grad. Sch. of Science Nagoya Univ.) Watanabe, K. (Earth Simulator Center) Horiuchi, R. We have been developing non-hydrostatic coupled atmosphere-ocean model on the Earth Simulator. As oceanic component of the coupled model with high res-olution, we adopted Yin-Yang grid system, which have developed Solid Earth Simulation Group of the Earth Simulator Center, as well as non-hydrostaitc atmosphere component. Yin-Yang grid system is one of the over-set grid which combines two identical latitude longitude grids.{Fig.1.) The unique feature of our ocean model to date is introduction of tide and momentum and thermo-dynamic equations for an compressible Boussinesq fluid. In this report, as the first step of our developing, we show preliminary validation results of propagation of in-ternal gravity wave and equatorial Kelvin/Rossby waves. We use hydrostatic Boussinesq equation systems as fol-lows. 81 ,. ' 8t = -v· (vi) - V,!, + PO'+ Zf x· n +".8 D.H" Do= "H D.'f C 'DT ="B' D.H T' Dt t' ." :p:=.P-podr ~'=[V"B"dr f=f1'IJ J-H .'0 9if , ' " ,9 = - ;:.:r P = fI(C, T, P} We configure the salinity anormaly as an initial fluctu-ations. Radius of salinity anormaly about 3000km and depth is 500m. We perform simulation with horizontal resolution 260km and vertical resolution 100m. The sim-ulation area is the rectangular area which width 45 0 of . latitude direction, width 120 0 of longitude direction. Fig.2. shows the propagation of the internal gravity wave. The propagation of initial fluctuation is under-stand. This propagation velocity is 4 {m/s).This is valid as a speed of the internal gravity. (Depth of the sea is 4km.) Fig.3. presents the propagation of the equatorial Kelvin wave. The equatorial Kelvin wave which is spread to west is seen. In addition, propagation of the Rossby wave to east direction is seen. These propagation velocity is varid as a speed of the Kelvin/Rossby waves. For verification of tbe simulation code, we have per-formed that the initial fluctuation keeps being spread as internal gravity wave and equatorial Kelvin/Rossby waves. 380 In the future, we will verify global non-hydro-static simulation result which considers realistic topography and Mellor-Yamada and Smagorinsky turbulent mod-els which have already been intro<!uced. In addition, we will study the impact of Constrained Interpolation Profile-Conservative Semi Lagrangian with Rational fuc-tion (CIP-CSLR) scheme introduced our simulation code as a new. Fig. 1. Yin-Yang grid system. This grid system is one of the overset grid which combines two identical latitude longitude grids. Fig. 2. Propagation of internal gravity wave.{t=lOdays) Fig. 3. Propagation of equatorial Kelvin/Rossby waves.{t=15days) References 1) Kageyama, A., Sato, T., 2003, to be published Geochem.Geophys.Geosyst., E-print: physics/0403123. 2) Matsuno, T., 1966, J. meteor. Soc. Japan, 44, 25-42 

Development of Non-Hydrostatic Ocean Circulation Simulation Code

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