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The Lagrangian trajectories in the southwestern Yellow Sea in response to tidal and wind forces are investigated using a high-resolution circulation model. The simulated tidal harmonic constants agree... with the observations and existing studies well. The numerical experiment reproduces the long-range southeastward Eulerian tidal residual current over the sloping bottom around Yangtze Bank as shown in previous studies. However, the artificial drifters deployed at the northeast flank of Yangtze Bank in the simulation move northward against this strong southeastward Eulerian tidal residual current rather than following it. The result suggests that the influence of tidal residual currents on Lagrangian trajectories is weaker than that of southerly wind. Thus, the Lagrangian trajectories are dominated by wind driven currents in the southwestern Yellow Sea. The result is consistent with the northeastward movement of ARGOS surface drifters released in the southwestern Yellow Sea in the summer of 2009. Further analyses suggest that the quadratic bottom friction scheme is the crucial factor for the weaker influence of the tidal residual currents on Lagrangian trajectories in the southwestern Yellow Sea. This study demonstrates that the movement directions of Lagrangian trajectory and Eulerian velocity are different at shallow coastal regions due to nonlinearity of the bottom friction.show more
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