Shelf mud is an important sink for fluvial sediment, and it is sensitive to variations in river discharge and ocean circulation, which are significantly influenced by climate change. However, the evolution of shelf mud in response to climate change during the Holocene is poorly understood. Here, we present high‐resolution sedimentary records of heavy minerals and mass accumulation rates (MARs) from the East China Sea shelf to study the response mechanisms of the Holocene shelf mud supply, transport, and sedimentation to the climate‐driven variations in fluvial discharge and ocean currents. The results indicate that the shelf mud primarily originates from the Changjiang (Yangtze) River and has been mainly transported by wind‐driven longshore currents in suspension since approximately 8.0 ka. A comparison of the MARs with several shelf mud sedimentation‐rate records and climate changes during the Holocene on millennial timescales showed that strong (weak) precipitation in the river basin, which is positively linked with Asian summer monsoon and El Niño‐driven storms, could intensify (weaken) the fluvial sediment supply, thereby increasing (decreasing) the shelf mud deposition flux. On multicentennial timescales, changes in the relative intensities of different ocean currents due to climate oscillations during the Holocene could generate frequent migrations of the current shear front (a hydrodynamic barrier), which has trapped an abundance of suspended materials on the shoreward side and resulted in rapid mud sedimentation (~2.3 g/cm²/year) at different sites during different periods. Therefore, our study highlights that the Holocene shelf mud evolution responds sensitively to climate changes on different timescales.

中文翻译：

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全新世气候调节东海陆架上的泥浆供应，运输和沉积

架子上的泥是河流沉积物的重要汇，它对河流排放和海洋环流的变化敏感，气候变化对河流和海洋环流的影响很大。然而，人们对新世时期响应气候变化的陆架泥的演化了解甚少。在这里，我们提供了东海陆架的重矿物和质量累积速率（MAR）的高分辨率沉积记录，以研究全新世陆架泥浆的供应，运输和沉积对河流排放的气候驱动变化的响应机制。和洋流。结果表明，陆架泥浆主要来自长江（长江），并且自大约8.0 ka起主要由风驱动的沿岸气流悬浮运输。在千禧年尺度上将全新世MAR与几个陆架泥浆沉积速率记录和全新世期间的气候变化进行比较，结果表明，流域的强（弱）降水与亚洲夏季风和厄尔尼诺现象驱动的风暴有正相关关系增强（减弱）河流沉积物的供应，从而增加（减少）架子上的泥沙沉积通量。在数百年的时间尺度上，由于全新世期间气候振荡而引起的不同洋流相对强度的变化可能会导致当前切变锋面（流体动力屏障）的频繁迁移，从而将大量的悬浮物困在岸边，并导致快速泥沙沉降（〜2.3 g / cm 可能会增加（减弱）河流沉积物的供应，从而增加（减少）陆架泥沙的沉积通量。在数百年的时间尺度上，由于全新世期间气候振荡而引起的不同洋流相对强度的变化可能会导致当前切变锋面（流体动力屏障）的频繁迁移，从而将大量的悬浮物困在岸边，并导致快速泥沙沉降（〜2.3 g / cm 可能会增加（减弱）河流沉积物的供应，从而增加（减少）陆架泥沙的沉积通量。在数百年的时间尺度上，由于全新世期间气候振荡而引起的不同洋流相对强度的变化可能会导致当前切变锋面（流体动力屏障）的频繁迁移，从而将大量的悬浮物困在岸边，并导致快速泥沙沉降（〜2.3 g / cm^2个/年）。因此，我们的研究强调，全新世陆架泥浆的演化对不同时间尺度的气候变化敏感。