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Abstract: A global sensitivity analysis (GSA) is performed on a marine ecosystem dynamic model by using Morris’ method with testing 10,000 times in this paper. This statistical sampling method allows to display nonlinear characteristics of interactions among various parameters and rank the most relevant parameters of the model. With this method, we proposed the model''s parameter optimization strategy and applied this to the Sanggou Bay. The results showed that the method not only can safeguard the objectivity of parameter set initial values, but also can avoid stochasticity of analytical results. Compared with the local one, the GSA is found to have a series of advantages, which supports necessity of developing it. [Copyright &y& Elsevier]

We adopt a parameterized internal tide dissipation term to the two-dimensional (2-D) shallow water equations, and develop the corresponding adjoint model to investigate tidal dynamics in the South China Sea (SCS). The harmonic constants derived from 63 tidal gauge stations and 24 TOPEX/Poseidon (T/P) satellite altimeter crossover points are assimilated into the adjoint model to minimize the deviations of the simulated results and observations by optimizing the bottom friction coefficient and the internal tide dissipation coefficient. Tidal constituents M 2 , S 2 , K 1 and O 1 are simulated simultaneously. The numerical results (assimilating only tidal gauge data) agree well with T/P data showing that the model results are reliable. The co-tidal charts of M 2 , S 2 , K 1 and O 1 are obtained, which reflect the characteristics of tides in the SCS. The tidal energy flux is analyzed based on numerical results. The strongest tidal energy flux appears in the Luzon Strait (LS) for both semi-diurnal and diurnal tidal constituents. The analysis of tidal energy dissipation indicates that the bottom friction dissipation occurs mainly in shallow water area, meanwhile the internal tide dissipation is mainly concentrated in the LS and the deep basin of the SCS. The tidal energetics in the LS is examined showing that the tidal energy input closely balances the tidal energy dissipation. [ABSTRACT FROM AUTHOR]