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

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

doi:10.1016/j.marpolbul.2022.113708

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

Mar Pollut Bull. 2022 Jun:179:113708. doi: 10.1016/j.marpolbul.2022.113708. Epub 2022 May 6.

Authors

Affiliations

¹ Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf, Beibu Gulf University, Qinzhou 535011, China.
² Key Laboratory of Urban Land Resources Monitoring and Simulation, Ministry of Natural Resources, Shenzhen 518000, China.
³ Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf, Beibu Gulf University, Qinzhou 535011, China. Electronic address: binyang@bbgu.edu.cn.
⁴ Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning 530004, China.
⁵ Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf, Beibu Gulf University, Qinzhou 535011, China. Electronic address: ldl@bbgu.edu.cn.
⁶ Army Logistics Academy of People's Liberation Army of China, Chongqing 401331, China.

PMID: 35533618
DOI: 10.1016/j.marpolbul.2022.113708

Abstract

The contents of chemothermal oxidation (CTO)-derived black carbon (BC) and organic carbon (OC) and their stable isotopes (δ¹³C_BC and δ¹³C_OC), 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.

Keywords: Black carbon; Burial flux; Daya Bay; Mass inventory; Sources.

MeSH terms

Bays*
Burial
Carbon / analysis
China
Environmental Monitoring
Geologic Sediments*
Soot / analysis

Substances

Soot
Carbon