Sediment resuspension-driven recycling of particulate organic carbon along the Yangtze River–estuary–coastal ocean continuum

The Dataset contains information on sampling characteristics, organic carbon content, and compositions of suspended sediments from the Yangtze River, its estuary, bed sediments from the East China Sea, and nine sediment cores from the Yangtze River Estuary and the East China Sea. Supplementary Data 1 includes sample description, location, organic carbon content (OC), stable (delta13C), and radiogenic (F14C) isotopic composition of the Yangtze River samples. Supplementary Data 2 provides information on the sampling sites, OC, delta13C, and F14C of surface sediment samples from the East China Sea. Supplementary Data 3 contains nine sediment cores data from the Yangtze River Estuary-East China Sea, including sample location, OC, N/C ratio, Al/Si ratio, delta13C, and delta 15N. Supplementary Data 4 shows the compositional characteristics of POC in the Yangtze River. Supplementary Data 5 shows the composition of POC in the Yangtze River Estuary during a flood season. Here, we used new geochemical and sedimentological data, in conjunction with existing literature, to investigate the impact of physical sediment reworking and lateral transport processes on the fate of terrestrial POC at the land-ocean interface. Our data shows that sediment reworking and remobilization by physical forces within the Yangtze River Estuary induces the degradation and aging of POC, which can diminish the carbon storage potential of marine sediments.本数据集包含长江干流、长江河口的悬浮沉积物采样特征、有机碳含量及组分数据，东海的底床沉积物数据，以及长江口与东海海域的9个沉积物岩芯数据。补充数据1包含长江流域样品的样品信息、采样点位、有机碳（Organic Carbon, OC）含量、稳定碳同位素（δ¹³C）与放射成因碳同位素（F14C）组成。补充数据2提供了东海表层沉积物样品的采样点位、OC含量、δ¹³C及F14C相关参数。补充数据3包含长江口-东海海域9个沉积物岩芯的相关数据，涵盖采样点位、OC含量、N/C比值、Al/Si比值、δ¹³C及δ¹⁵N。补充数据4展示了长江中颗粒有机碳（Particulate Organic Carbon, POC）的组分特征。补充数据5展示了汛期长江口颗粒有机碳的组分特征。本研究结合新获取的地球化学与沉积学数据及已有文献资料，探究了沉积物物理改造与横向输运过程对陆-海界面陆地来源颗粒有机碳归趋的影响。研究结果表明，长江口内物理作用力引发的沉积物改造与再悬浮过程，会导致颗粒有机碳发生降解与老化，进而削弱海洋沉积物的碳储潜力。