基于高频地波雷达组网数据对环山东半岛沿岸流的变化特征分析OA北大核心

The Shandong coastal current is an important branch of the Yellow Sea coastal current system and is one of the main physical processes affecting the water and material exchange between the Bohai Sea and the Yellow Sea.However,only a few observations have been made to characterize its spatial and temporal variations.Based on three sets of high-frequency ground wave radar network observations from six stations surrounding the Shandong Peninsula,we investigated the spatial and temporal characteristics of tidal and residual currents surrounding the Shandong Peninsula.Results showed that most of the northern part of the Shandong Peninsula is dominated by ir-regular semidiurnal currents,whereas the Yantai-Weihai area between 121°30′E and 122°E is dominated by irregu-lar diurnal currents.The southern part of the Shandong Peninsula is dominated by regular semidiurnal currents.The Lubei coastal current(i.e.,the northern branch of the Shandong coastal current)is stronger in winter and summer and weaker in spring and autumn,with a mean surface current velocity of approximately 20-30 and 5-15 cm/s,re-spectively.The direction of the Lubei coastal current is relatively stable throughout the year and mainly flows southeastward.The coastal current in the southern part of the Shandong Peninsula is weaker than that along the northern coast and is approximately 2-10 cm/s.We determined that the strong north wind in winter may be the main factor driving the Lubei coastal current,which is stronger under high-speed wind conditions.In other seasons,the Lubei coastal current flows southeastward and may flow in the upwind direction,especially in summer.The surface residual current in the southern part of the Shandong Peninsula is distinguished by frequent changes in direction and behaves with remarkable seasonal variation.In winter,the residual current in the southern part connects with the Lubei coastal current and flows southwestward.In other seasons,the velocity of the southern branch is weaker and tends to be in the same direction as the local wind.The results presented in this study deepen our understanding of the characteristics and mechanisms of Shandong coastal currents and their roles in regulating the exchange between the Bohai Sea and the Yellow Sea.