Sedimentary processes on continental shelves are affected by complex interactions between a variety of riverine and oceanographic processes. In the shelf of the East China Sea (ECS) south of the Yangtze River estuary, we investigated source-to-sink processes relating to local riverine input as well as the effects of the Kuroshio intrusion by examining the distribution of long-chain alkyl diols in surface and core sediments. The results show that at present the main source of 1,14-diols is most likely diatoms belonging to the genus Proboscia. Most C₃₂ 1,15-diol is produced in situ in local rivers (rather than originating from the Yangtze River) and its distribution is mainly restricted to the front of local river mouths along the coast (water depth < 50 m) due to the hydrodynamism of the nearshore circulation system. Although the sources of the 1,13- and 1,15-diols remain uncertain, principal component analysis and their distribution patterns suggest that 1,14-, 1,13- and 1,15-diols have different biological sources, and that their producers may bloom in different seasons. The long chain diol index (LDI), a proxy for sea surface temperature (SST), was used in this study to reconstruct records of SST (with a bias towards autumn temperatures) in different parts of the ECS shelf, except for shallow water areas (water depth < 50 m), which are more affected by riverine input. The diol index (DI), based on 1,14-diols, worked well as a upwelling tracer in our study area, and our results show that upwelling prevails in the ECS shelf and that zones of strengthened upwelling are present to some extent at ~28.8°N–29.6°N and ~ 27.0°N–27.8°N during the summer due to the interaction of geomorphology, monsoons, and different water masses (i.e., the Kuroshio branch and the Yangtze River diluted water). The nutrient diol index (NDI) shows potential as an indicator for nutrient concentration in the surface waters in this study area during the warm season, but further work is needed.

大陆架上的沉积过程受到各种河流和海洋过程之间复杂相互作用的影响。在长江口以南的东海 (ECS) 大陆架，我们通过检查长链烷基二醇的分布，研究了与当地河流输入相关的源到汇过程以及黑潮入侵的影响在地表和核心沉积物中。结果表明，目前的1,14-二醇的主要来源是属于埃希最可能硅藻Proboscia。大多数 C ₃₂1,15-二醇产自当地河流（而非长江），由于河流的水动力作用，其分布主要限于沿海岸的当地河口前部（水深<50 m）。近岸循环系统。尽管 1,13- 和 1,15- 二醇的来源仍不确定，但主成分分析及其分布模式表明 1,14-、1,13- 和 1,15-二醇具有不同的生物来源，并且它们的生产者可能在不同的季节开花。长链二醇指数（LDI）是海面温度（SST）的代表，在本研究中被用于重建除浅水区外的 ECS 大陆架不同部分的 SST 记录（偏向秋季温度） （水深 < 50 m），受河流输入的影响更大。二醇指数 (DI) 基于 1,14-二醇，在我们的研究区作为上升流示踪剂效果很好，我们的结果表明，ECS 大陆架普遍存在上升流，并且在~由于地貌、季风和不同水团（即黑潮支流和长江稀释水）的相互作用，夏季28.8°N–29.6°N 和~27.0°N–27.8°N。养分二醇指数 (NDI) 显示出作为该研究区在暖季地表水中养分浓度指标的潜力，但还需要进一步的工作。由于地貌、季风和不同水团（即黑潮支流和长江稀释水）的相互作用，夏季为 8°N。养分二醇指数 (NDI) 显示出作为该研究区在暖季地表水中养分浓度指标的潜力，但还需要进一步的工作。由于地貌、季风和不同水团（即黑潮支流和长江稀释水）的相互作用，夏季为 8°N。养分二醇指数 (NDI) 显示出作为本研究区地表水暖季养分浓度指标的潜力，但还需要进一步的工作。