从陆架海到西太平洋:黄、东海悬浮体跨陆架输运通道与机制

From continental shelf seas to the western Pacific:the path and mechanism of cross-shelf suspended sediment transport in the Yellow Sea and East China Sea

黄、东海是亚洲大陆与西太平洋物质和能量交换的重要海域之一,在复杂的环流动力背景下,悬浮体的跨陆架输运是海洋地质学的研究热点。目前的研究表明,黄、东海物质跨陆架输运主要通过三条路径,包括苏北沿岸流作用下向济州岛西南搬运、浙闽北部向东输运和台湾暖流向东分支作用下跨陆架输运。其控制机制有水深地形、陆架环流、冬季风、水体斜压结构等研究结论,但尚未取得共识。且研究结论多基于叶绿素、水温等表层遥感分析获得,悬浮泥沙尤其是中下层高浓度泥沙跨陆架向深海输运的机制有待深入研究,此外,其季节变化、时空演变、输运通量等有待研究,台风、冬季风暴等的作用有待甄别。

The Yellow Sea and East China Sea are important pathways for the material and energy exchange between the continental shelf and western Pacific.Because of the complicated hydrodynamic environment,the cross-shelf suspended sediment transport is important for the marine geological study in this area.According to the previous works,there are three paths for the cross-shelf material transport,including the southeasterly transport to the southwestern Cheju Island by the Subei coastal current,easterly transport in the northern Zhemin,and seaward transport due to eastern branch of the Taiwan Warm Current.The mechanisms of these processes can be concluded as topography,shelf current,winter wind,baroclinic distribution of water temperature and salinity and so on.However,the results are mostly based on the remote sensing analysis of chlorophyll,water temperature at the surface layer,and there is a lack of study of the cross-shelf suspended sediment transport,especially at the bottom layer.Furthermore,sediment flux with its seasonal and temporalspatial variations,the effect of typhoon and winter storms also need further study.