Case analysis of water exchange between the Bohai and Yellow Seas in response to high winds in winter

更新时间:2023-05-28

【摘要】Based on the data from a special project titled China’s Of fshore Marine Integrated Investigation and Evaluation as well as Regional Ocean Modeling Systems(ROMS) diagnostic numerical model, we studied the in?uence of high wind processes on the circulation and water exchange between the Bohai and Yellow Seas(BYS) in winter. The results show that the vertical structure of the Yellow Sea Warm Current(YSWC) is relatively uniform under condition of high winds, showing obvious barotropic features. However, this ?ow is not a stable mean ?ow, showing strong paroxysmal and reciprocating characteristics. A comparison of the changes in sea level suggests that the intensity of the northwards upwind ?ow is consistent with the abnormal ?uctuations in the sea level. It indicates that the upwind ?ow is closely related to the water exchange between the BYS. The impact of high wind processes on the water exchange between the BYS is enormous. It can make the ?ux through the Bohai Strait, as well as that through the mouth of each constituent bay(i.e., Liaodong Bay, Bohai Bay, and Laizhou Bay) far greater than usual, resulting in a signi?cant increase in the water exchange rate. The exchange capacity, which is about 8% of the total volume of the Bohai Sea, can be completed in a few days. Therefore, the water exchange of the Bohai Sea may be completed by only a few occasional high wind processes in winter.

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