Sources, burial flux and mass inventory of black carbon in surface sediments of the Daya Bay, a typical mariculture bay of China. (June 2022)

• Record Type: Journal Article
• Authors: Dan, Solomon Felix; Cui, Dongyang; Yang, Bin; Wang, Xilong; Ning, Zhiming; Lu, Dongliang; Kang, Zhenjun; Huang, Haifang; Zhou, Jiaodi; Cui, Dandan; Zhong, Qiuping
• Is Part Of: Marine pollution bulletin. Volume 179(2022)
• Publication Date: 2022-06
• Subjects: Black carbon -- Sources -- Burial flux -- Mass inventory -- Daya Bay; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2022.113708
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: The contents of chemothermal oxidation (CTO)-derived black carbon (BC) and organic carbon (OC) and their stable isotopes ( δ 13 CBC and δ 13 COC ), 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. Highlights: Black carbon (BC) was first studied in surface sediments of the Daya Bay. Sources of BC were attributed to fossil fuel emissions and physical erosion. Significant burial of BC is strongly related to sorption on fine-grained sediments. BC is a significant component of sedimentary recalcitrant organic carbon in the bay. The Daya Bay is a significant sink of BC.