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Numerical calculation of dispersion relation for linear internal waves
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With the horizontal Coriolis terms included in motion equations and the influence of compressibility of seawater on Brunt-Vaeisaelae frequency considered, a numerical method of calculating the dispersion relation for linear internal waves, which is an improvement of Cai and Gan (1995), and hence Fliegel and Hunkins (1975), had been set up. For different models (Pacific model, Atlantic model and Arctic model), simulations using the three different methods were compared and the following conclusions were reached: (1) the influence of horizontal Coriolis terms on dispersion relation cannot be neglected and is connected with the direction of the wave celerity, the latitude, and the modes of the wave; (2) the effect of compressibility of seawater in stratification is not an important factor for the dispersion relation of linear internal wave, at least for those three models. With the improved method, the wavefunction curves for the Pacific model had also been built.
dispersion relationboussinesq approximationbrunt-vaeisaelae frequency
WANG Gang、HOU Yijun、LIN Min
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Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
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