Sedimentary organic nitrogen isotope records in the Northern South China Sea

The following supplementary datasets consist of informations of sedimentary organic carbon, biogenic silica and total and organic nitrogen and their stable isotopes collected in a well-dated sediment core (NH07) collected from the northern South China Sea in the summer of 2017.以下补充数据集涵盖了2017年夏季采自南海北部的定年精准沉积物岩芯（NH07）中测得的沉积有机碳（sedimentary organic carbon）、生物硅（biogenic silica）、总氮与有机氮（total and organic nitrogen）及其稳定同位素（stable isotopes）相关数据。