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Pages: 1479-1485
Year: Issue:  6
Journal: Oceanologia et Limnologia Sinica

Keyword:  the southwestern Yellow SeaM2 tideM2 tidal currentvertical mixing coefficientstopography effect;
Abstract: We modeled the M2 tide over the southwestern Yellow Sea using the Princeton Ocean Model(POM) and topography data from Chinese navy. The simulated sea-level harmonics agree well with the tide-gauge sea-level harmonics at Qingdao, Shijiusuo, and Lvsi. However, the simulated tidal range at Lianyungang is much smaller than that of the tide-gauge data due to the inaccuracy of topography in vicinity. The simulated tidal currents agree well with currentmeter measurements in the upper and middle layers at a mooring site in the middle of the Lunan Trough. However, the amplitude of the simulated tidal current near the bottom of the ocean is smaller than the observed. The error is found associated with erroneous vertical mixing coefficients calculated based on the turbulent closure scheme in the POM model. Our modeling shows that the simulated M2 tide in the southwestern Yellow Sea is sensitive to topography data used in the model. The simulation using the ETOPO5 elevation data produced significantly different results from the one using the topography data from local navigational chart. Smoother ETOPO5 elevation data resulted in smaller sea-level amplitudes, phase leads, and weaker currents along the coast of the southwestern Yellow Sea. The Lunan Trough plays a role in increasing the amplitude of the M2 tide in the southwestern Yellow Sea whereas the Subei Bank acts as a barrier to the southward propagating tidal waves. Omission of the Lunan Trough and the Subei Bank in the smoother ETOPO5 elevation data led to the inaccurate modeling results along the coast.
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