Bulk and refractory organic carbon composition in 210Pb- and 137Cs-dated sediment cores from the East China Sea

We show the continuous high-resolution records of sedimentary organic carbon (OC) burial in the inner shelf of the East China Sea, spanning from the 1850s to the present, to reveal the past linkages in terrestrial OC cycling and fluvial sediment dynamics with climate changes and perturbed by direct human interventions. We find that humans have decreased the accumulation of terrestrial OC in marine sediments while increasing the export of riverine refractory OC. The uploaded datasets included the concentration of both total and refractory organic carbon and their elemental ratio (C/N), stable carbon (δ13Corg), nitrogen (δ15N) isotopic composition, the estimated proportions of terrestrial OC (both total and refractory fractions), as well as the measured dry bulk density (DBD) in the core C0702 from the East China Sea. This dataset also includes compiled OC data in 14 210Pb and/or 137Cs-dated sediment cores from the East China Sea.

本数据集展示了自19世纪50年代至今，我国东海陆架区沉积有机碳（OC）埋藏的连续高分辨率记录，旨在揭示过去陆地OC循环与河流沉积动力学的演变过程，及其与气候变化及人类直接干预之间的联系。研究发现，人类活动导致陆地OC在海洋沉积物中的积累减少，同时增加了河流难溶OC的输出。所上传的数据集包括总有机碳和难溶有机碳的浓度及其元素比（C/N）、稳定碳同位素（δ13Corg）、氮同位素（δ15N）组成，以及陆地OC（包括总量和难溶部分）的估计比例，以及东海C0702柱状样品的干重密度（DBD）测量值。此外，该数据集还包含利用210Pb和/或137Cs年代学方法测定的东海沉积柱状样品中的OC数据。