Sources, burial flux and mass inventory of black carbon in surface sediments of the Daya Bay, a typical mariculture bay of China

Dan, Solomon Felix; Cui, Dongyang; Yang, Bin; Wang, Xilong; Ning, Zhiming; Lü, Dongliang; Kang, Zhenjun; Huang, Haifang; Zhou, Jiaodi; Cui, Dandan; Zhong, Qiuping

Sources, burial flux and mass inventory of black carbon in surface sediments of the Daya Bay, a typical mariculture bay of China

2022

The contents of chemothermal oxidation (CTO)-derived black carbon (BC) and organic carbon (OC) and their stable isotopes (δ¹³CBC and δ¹³COC), including major elemental oxides, and grain sizes were measured to constrain the sources, burial flux, and mass inventory of BC in surface sediments of the Daya Bay. Surface sediments were mainly clayey silt (>90%) and contained 0.28–1.18% OC and 0.05–0.18% BC. Fossil fuel emission and physical erosion contributed to the sedimentary BC sources. High BC/OC ratio (6–30%), burial flux (154.88–922.67 μg cm⁻² y⁻¹), and mass inventory (22–34 Gg y⁻¹) of BC in the upper 5 cm of surface sediments indicated that the Daya Bay is a significant sink of BC. The high accumulation of BC in sediments is attributed to a strong affinity to fine-grained sediments due to the enrichment of muddy biodeposits excrements from the cultured species in the bay.

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