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

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 ae...

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Main Authors: Geng, Xiaofei, Zhong, Guangcai, Liu, Junwen, Sun, Yue, Yi, Xin, Bong, Chui Wei, Zakaria, Mohamad Pauzi, Gustafsson, Orjan, Ouyang, Yan, Zhang, Gan
Format: Article
Published: Amer Geophysical Union 2021
Subjects:
GE Environmental Sciences
QC Physics
Online Access:http://eprints.um.edu.my/34344/
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spelling my.um.eprints.343442022-09-12T04:12:17Z http://eprints.um.edu.my/34344/ Year-round measurements of dissolved black carbon in Coastal Southeast Asia aerosols: Rethinking its atmospheric deposition in the Ocean Geng, Xiaofei Zhong, Guangcai Liu, Junwen Sun, Yue Yi, Xin Bong, Chui Wei Zakaria, Mohamad Pauzi Gustafsson, Orjan Ouyang, Yan Zhang, Gan GE Environmental Sciences QC Physics 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. Amer Geophysical Union 2021-09-27 Article PeerReviewed 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 https://doi.org/10.1029/2021JD034590 <https://doi.org/10.1029/2021JD034590>. 10.1029/2021JD034590
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic GE Environmental Sciences
QC Physics
spellingShingle GE Environmental Sciences
QC Physics
Geng, Xiaofei
Zhong, Guangcai
Liu, Junwen
Sun, Yue
Yi, Xin
Bong, Chui Wei
Zakaria, Mohamad Pauzi
Gustafsson, Orjan
Ouyang, Yan
Zhang, Gan
Year-round measurements of dissolved black carbon in Coastal Southeast Asia aerosols: Rethinking its atmospheric deposition in the Ocean
description 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.
format Article
author Geng, Xiaofei
Zhong, Guangcai
Liu, Junwen
Sun, Yue
Yi, Xin
Bong, Chui Wei
Zakaria, Mohamad Pauzi
Gustafsson, Orjan
Ouyang, Yan
Zhang, Gan
author_facet Geng, Xiaofei
Zhong, Guangcai
Liu, Junwen
Sun, Yue
Yi, Xin
Bong, Chui Wei
Zakaria, Mohamad Pauzi
Gustafsson, Orjan
Ouyang, Yan
Zhang, Gan
author_sort Geng, Xiaofei
title Year-round measurements of dissolved black carbon in Coastal Southeast Asia aerosols: Rethinking its atmospheric deposition in the Ocean
title_short Year-round measurements of dissolved black carbon in Coastal Southeast Asia aerosols: Rethinking its atmospheric deposition in the Ocean
title_full Year-round measurements of dissolved black carbon in Coastal Southeast Asia aerosols: Rethinking its atmospheric deposition in the Ocean
title_fullStr Year-round measurements of dissolved black carbon in Coastal Southeast Asia aerosols: Rethinking its atmospheric deposition in the Ocean
title_full_unstemmed Year-round measurements of dissolved black carbon in Coastal Southeast Asia aerosols: Rethinking its atmospheric deposition in the Ocean
title_sort year-round measurements of dissolved black carbon in coastal southeast asia aerosols: rethinking its atmospheric deposition in the ocean
publisher Amer Geophysical Union
publishDate 2021
url http://eprints.um.edu.my/34344/
_version_ 1744649173724037120
score 13.211869

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