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.本研究呈现了1850年代至今东海内陆架沉积有机碳（organic carbon, OC）埋藏的连续高分辨率记录，旨在揭示过去陆源有机碳循环、河流沉积物动力过程与气候变化之间的关联，以及人类直接干预对上述过程的扰动影响。研究发现，人类活动已降低了海洋沉积物中陆源有机碳的堆积通量，同时提升了河流难降解有机碳的输出量。本次上传的数据集涵盖了东海C0702岩心的总有机碳与难降解有机碳浓度、二者的碳氮元素比（C/N）、稳定碳（δ¹³Corg）与氮（δ¹⁵N）同位素组成、估算得到的陆源有机碳占比（包括总陆源有机碳与难降解陆源有机碳组分），以及实测的干容重（dry bulk density, DBD）。本数据集还包含了东海地区14根经²¹⁰Pb和/或¹³⁷Cs定年的沉积物岩心中的汇编有机碳数据。

搜集汇总

背景与挑战

背景概述

该数据集提供了东海沉积物岩芯中有机碳组成的高分辨率历史记录，时间跨度为1850年代至今，包含总有机碳和难降解有机碳的浓度、元素比例、稳定同位素组成及陆地有机碳比例等关键参数。数据集不仅涵盖单个岩芯（C0702）的详细测量数据，还汇编了东海14个210Pb和/或137Cs定年沉积物岩芯的有机碳数据，用于研究人类活动和气候变化对陆地有机碳循环及河流沉积物动态的影响。