Year-round measurements of dissolved black carbon in Coastal Southeast Asia aerosols: Rethinking its atmospheric deposition in the Ocean

Geng, Xiaofei and Zhong, Guangcai and Liu, Junwen and Sun, Yue and Yi, Xin and Bong, Chui Wei and Zakaria, Mohamad Pauzi and Gustafsson, Orjan and Ouyang, Yan and Zhang, Gan (2021) Year-round measurements of dissolved black carbon in Coastal Southeast Asia aerosols: Rethinking its atmospheric deposition in the Ocean. Journal of Geophysical Research-Atmospheres, 126 (18). ISSN 2169-897X, DOI

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Dissolved black carbon (DBC) is an important recalcitrant fraction of marine dissolved organic matter. Riverine discharge is the largest known source of oceanic DBC; however, the significance of atmospheric deposition as a source of oceanic DBC remains poorly understood. In this study, year-round aerosol sampling was carried out at a rural coastal site in Southeast Asia for DBC analysis using the benzene polycarboxylic acid (BPCA) method. The results revealed the uncertainty of an earlier estimate of the atmospheric deposition flux of DBC to the global ocean (F-DBC), which assumed a linear correlation between DBC and water-soluble organic carbon (WSOC). The correlation between DBC and WSOC depended on the sources of carbonaceous aerosols. The DBC/WSOC ratios were higher for the biomass burning aerosols. DBC was linearly correlated with black carbon (BC) for biomass or fossil fuel combustion aerosols. However, the DBC/BC ratios were higher for biomass burning aerosols (0.41 +/- 0.22), whereas lower for fossil fuel combustion aerosols (0.04 +/- 0.03). F-DBC was revisited based on the relationship between DBC and BC. F-DBC is primarily contributed by biomass burning aerosols and maybe previously underestimated. In this study, the DBC in aerosols had less condensed aromatic structures than the DBC present in the major rivers of the world, as shown by the BPCA compositions. This indicated that oceanic DBC sourced from atmospheric deposition was less likely to be removed by photodegradation and sedimentation, as compared to the DBC sourced from riverine discharge.

Item Type: Article
Funders: National Natural Science Foundation of China (NSFC)[41430645], National Natural Science Foundation of China (NSFC)[41877349], International Partnership Program of Chinese Academy of Sciences[132744KYSB20170002], State Key Laboratory of Organic Geochemistry, GIGCAS[SKLOG2020-3], State Key Laboratory of Organic Geochemistry, GIGCAS[SKLOG-201744], Guangdong Foundation for Program of Science and Technology Research[2019B121205006], Ministry of Higher Education Malaysia (HICoE Phase II Fund)[IOES-2014D], Swedish Research Foundation Vinnova[2016-04077], Swedish Research Council[2015-03279], VR Distinguished Professorship Grant[2017-01601], China-Sri Lanka Joint Center for Education and Research, Chinese Academy of Sciences
Uncontrolled Keywords: Dissolved black carbon;Benzene polycarboxylic acid;Marine aerosols;Atmospheric deposition;Black carbon cycle
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QC Physics
Divisions: Faculty of Science
Depositing User: Ms Zaharah Ramly
Date Deposited: 12 Sep 2022 04:12
Last Modified: 12 Sep 2022 04:12

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