Dissolved organic matter in the northwestern Pacific marginal seas: Insight into the distribution of its optical properties
Dissolved organic carbon (DOC) and the optical properties of dissolved organic matter (chromophoric- and fluorescent dissolved organic matter; CDOM and FDOM) were measured to determine the distributions and drivers of DOM in the northwestern Pacific marginal seas, including the East China Sea, the Y...
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Frontiers Media S.A.
2023-03-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2023.1127803/full |
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| author | Heejun Han Hyung Bo Kim Jeonghyun Kim Guebuem Kim Jeomshik Hwang SungHyun Nam |
| author_facet | Heejun Han Hyung Bo Kim Jeonghyun Kim Guebuem Kim Jeomshik Hwang SungHyun Nam |
| author_sort | Heejun Han |
| collection | DOAJ |
| description | Dissolved organic carbon (DOC) and the optical properties of dissolved organic matter (chromophoric- and fluorescent dissolved organic matter; CDOM and FDOM) were measured to determine the distributions and drivers of DOM in the northwestern Pacific marginal seas, including the East China Sea, the Yellow Sea, and the East/Japan Sea, in August 2020. In this study, the concentrations of DOC and CDOM/FDOM in surface water showed good correlations with salinity, indicating a predominant contribution from the Changjiang River. However, significantly high concentrations of DOC and FDOM were also observed in the central Yellow Sea region, which seems to be produced mainly from the continental shelf-water and enriched over the water residence time of the Yellow Sea, while the lowest concentrations of DOC and CDOM/FDOM were found in high-salinity waters near the southern sea of Korea. In addition, the East/Japan Sea showed relatively low DOC concentrations and high FDOM values. To distinguish the physical mixing and biogeochemical processes of DOM, we estimated the water mass fractions using an optimum multi-parameter analysis with hydrological and DOM parameters of the major water masses in this region. Our results showed that five primary external drivers of DOM distribution were intrusions of (1) the Changjiang diluted water and (2) the Kuroshio Current water in the surface water, the mixing of (3) the Yellow Sea bottom cold water and (4) the Kuroshio sub-surface water in the bottom layer, and (5) upwelling of the East/Japan Sea water. We conclude that the distribution of DOM is significantly influenced by the mixing of multiple water masses, and the optical signature of DOM can be an effective proxy for tracing the origins and characteristics of DOM in this region. |
| first_indexed | 2024-04-10T05:07:27Z |
| format | Article |
| id | doaj.art-a76a15d631a141bdb3e62a7c8d899ab2 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-10T05:07:27Z |
| publishDate | 2023-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-a76a15d631a141bdb3e62a7c8d899ab22023-03-09T12:22:38ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452023-03-011010.3389/fmars.2023.11278031127803Dissolved organic matter in the northwestern Pacific marginal seas: Insight into the distribution of its optical propertiesHeejun Han0Hyung Bo Kim1Jeonghyun Kim2Guebuem Kim3Jeomshik Hwang4SungHyun Nam5School of Earth and Environmental Sciences/Research Institute of Oceanography, Seoul National University, Seoul, Republic of KoreaSchool of Earth and Environmental Sciences/Research Institute of Oceanography, Seoul National University, Seoul, Republic of KoreaDepartment of Earth and Marine Sciences, College of Ocean Science, Jeju National University, Jeju, Republic of KoreaSchool of Earth and Environmental Sciences/Research Institute of Oceanography, Seoul National University, Seoul, Republic of KoreaSchool of Earth and Environmental Sciences/Research Institute of Oceanography, Seoul National University, Seoul, Republic of KoreaSchool of Earth and Environmental Sciences/Research Institute of Oceanography, Seoul National University, Seoul, Republic of KoreaDissolved organic carbon (DOC) and the optical properties of dissolved organic matter (chromophoric- and fluorescent dissolved organic matter; CDOM and FDOM) were measured to determine the distributions and drivers of DOM in the northwestern Pacific marginal seas, including the East China Sea, the Yellow Sea, and the East/Japan Sea, in August 2020. In this study, the concentrations of DOC and CDOM/FDOM in surface water showed good correlations with salinity, indicating a predominant contribution from the Changjiang River. However, significantly high concentrations of DOC and FDOM were also observed in the central Yellow Sea region, which seems to be produced mainly from the continental shelf-water and enriched over the water residence time of the Yellow Sea, while the lowest concentrations of DOC and CDOM/FDOM were found in high-salinity waters near the southern sea of Korea. In addition, the East/Japan Sea showed relatively low DOC concentrations and high FDOM values. To distinguish the physical mixing and biogeochemical processes of DOM, we estimated the water mass fractions using an optimum multi-parameter analysis with hydrological and DOM parameters of the major water masses in this region. Our results showed that five primary external drivers of DOM distribution were intrusions of (1) the Changjiang diluted water and (2) the Kuroshio Current water in the surface water, the mixing of (3) the Yellow Sea bottom cold water and (4) the Kuroshio sub-surface water in the bottom layer, and (5) upwelling of the East/Japan Sea water. We conclude that the distribution of DOM is significantly influenced by the mixing of multiple water masses, and the optical signature of DOM can be an effective proxy for tracing the origins and characteristics of DOM in this region.https://www.frontiersin.org/articles/10.3389/fmars.2023.1127803/fulldissolved organic matter (DOM)chromophoric dissolved organic matter (CDOM)fluorescent dissolved organic matter (FDOM)parallel factor analysis (PARAFAC)marginal seasoptimum multi-parameter analysis |
| spellingShingle | Heejun Han Hyung Bo Kim Jeonghyun Kim Guebuem Kim Jeomshik Hwang SungHyun Nam Dissolved organic matter in the northwestern Pacific marginal seas: Insight into the distribution of its optical properties Frontiers in Marine Science dissolved organic matter (DOM) chromophoric dissolved organic matter (CDOM) fluorescent dissolved organic matter (FDOM) parallel factor analysis (PARAFAC) marginal seas optimum multi-parameter analysis |
| title | Dissolved organic matter in the northwestern Pacific marginal seas: Insight into the distribution of its optical properties |
| title_full | Dissolved organic matter in the northwestern Pacific marginal seas: Insight into the distribution of its optical properties |
| title_fullStr | Dissolved organic matter in the northwestern Pacific marginal seas: Insight into the distribution of its optical properties |
| title_full_unstemmed | Dissolved organic matter in the northwestern Pacific marginal seas: Insight into the distribution of its optical properties |
| title_short | Dissolved organic matter in the northwestern Pacific marginal seas: Insight into the distribution of its optical properties |
| title_sort | dissolved organic matter in the northwestern pacific marginal seas insight into the distribution of its optical properties |
| topic | dissolved organic matter (DOM) chromophoric dissolved organic matter (CDOM) fluorescent dissolved organic matter (FDOM) parallel factor analysis (PARAFAC) marginal seas optimum multi-parameter analysis |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2023.1127803/full |
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