Accurate prediction of sea water temperature has been emphasized to make precise local weather forecast and to understand change of ecosystem. The Yellow Sea, which has turbid water and strong tidal current, is an unique shallow marginal sea. It is essential to include the effects of the turbidity and the strong tidal mixing for the realistic simulation of temperature distribution in the Yellow Sea. Evaluation of ocean circulation model response to vertical mixing scheme and turbidity is primary objective of this study. Three-dimensional ocean circulation model(Regional Ocean Modeling System) was used to perform numerical simulations. MellorYamada level 2.5 closure (M-Y) and K-Profile Parameterization (KPP) scheme were selected for vertical mixing parameterization in this study. Effect of Jerlov water type 1, 3 and 5 was also evaluated. The simulated temperature distribution was compared with the observed data by National Fisheries Research and Development Institute to estimate model's response to turbidity and vertical mixing schemes in the Yellow Sea. Simulations with M-Y vertical mixing scheme produced relatively stronger vertical mixing and warmer bottom temperature than the observation. KPP scheme produced weaker vertical mixing and did not well reproduce tidal mixing front along the coast. However, KPP scheme keeps bottom temperature closer to the observation. Consequently, numerical ocean circulation simulations with M-Y vertical mixing scheme tends to produce well mixed vertical temperature structure and that with KPP vertical mixing scheme tends to make stratified vertical temperature
Multi-nested operational prediction system for the Yellow Sea (YS) has been developed to predict the movement of oil spill. Drifter trajectory simulations were performed to predict the path of the oil spill during the Hebei Spirit accident. The oil spill trajectories at the surface predicted by model with tidal forcing were comparable to the observation for one month experiment, whereas the speed of drifter predicted from the simulation without tidal forcing was remarkably faster than the observation. The bottom current flowing northward from the simulation without tidal forcing was also faster than that with tidal forcing in the interior of the YS. Increased bottom friction by strong tidal current induces increase of vertical mixing and decrease of vertical shear between the surface and bottom currents. Without tidal mixing the relatively strong bottom northward current, which could act as a compensation flow, may enhance the southward surface current. Strong tide might reduce upwind flow along the deep central trough in the YS.
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