Provenance of Aerosol Black Carbon over Northeast Indian Ocean and South China Sea and Implications for Oceanic Black Carbon Cycling

Geng, Xiaofei, Haig, Jordahna, Lin, Boji, Tian, Chongguo, Zhu, Sanyuan, Cheng, Zhineng, Yuan, Yupeng, Zhang, Yan, Liu, Junyi, Zheng, Mei, Li, Jun, Zhong, Guangcai, Zhao, Shizhen, Bird, Michael Ian, and Zhang, Gan (2023) Provenance of Aerosol Black Carbon over Northeast Indian Ocean and South China Sea and Implications for Oceanic Black Carbon Cycling. Environmental Science and Technology, 57. pp. 13067-13078.

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Aerosol black carbon (BC) is a short-lived climate pollutant. The poorly constrained provenance of tropical marine aerosol BC hinders the mechanistic understanding of extreme climate events and oceanic carbon cycling. Here, we collected PM2.5 samples during research cruise NORC2016-10 through South China Sea (SCS) and Northeast Indian Ocean (NEIO) and measured the dual-carbon isotope compositions (δ13C-Δ14C) of BC using hydrogen pyrolysis technique. Aerosol BC exhibits six different δ13C−Δ14C isotopic spaces (i.e., isotope provinces). Liquid fossil fuel combustion, from shipping emissions and adjacent land, is the predominant source of BC over isotope provinces “SCS close to Chinese Mainland” (53.5%), “Malacca Strait” (53.4%), and “Open NEIO” (40.7%). C3 biomass burning is the major contributor to BC over isotope provinces “NEIO close to Southeast Asia” (55.8%), “Open NEIO” (41.3%), and “Open SCS” (40.0%). Coal combustion and C4 biomass burning show higher contributions to BC over “Sunda Strait” and “Open SCS” than the others. Overall, NEIO near the Bay of Bengal, Malacca Strait, and north SCS are three hot spots of fossil fuel-derived BC; the first two areas are also hot spots of biomass-derived BC. The comparable δ13C-Δ14C between BC in aerosol and dissolved BC in surface seawater may suggest atmospheric BC deposition as a potential source of oceanic dissolved BC.

Item ID: 80543
Item Type: Article (Research - C1)
ISSN: 1520-5851
Keywords: black carbon, dual-carbon isotope, hydrogen pyrolysis, oceanic black carbon cycling, provenance, tropical marine aerosol
Copyright Information: © 2023 American Chemical Society
Date Deposited: 13 Feb 2024 23:26
FoR Codes: 41 ENVIRONMENTAL SCIENCES > 4105 Pollution and contamination > 410501 Environmental biogeochemistry @ 100%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280111 Expanding knowledge in the environmental sciences @ 100%
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