Particulate organic carbon export fluxes across the Seychelles-Chagos thermocline ridge in the western Indian Ocean using 234Th as a tracer
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Title
- Particulate organic carbon export fluxes across the Seychelles-Chagos thermocline ridge in the western Indian Ocean using 234Th as a tracer
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Author(s)
- Seo, Junhyeong; Kim, Intae; Kang, Dong Jin; Lee, Hyun Mi; Choi, Jin Young; Ra, Kongtae; Rho, Tae Keun; Park, Kyoungkyu; Kim, Suk Hyun
- KIOST Author(s)
- Seo, Junhyeong(서준형); Kim, Intae(김인태); Kang, Dong Jin(강동진); Lee, Hyun Mi(이현미); Choi, Jin Young(최진영); Ra, Kongtae(나공태); Rho, Tae Keun(노태근); Park, Kyoungkyu(박경규)
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Alternative Author(s)
- 서준형; 김인태; 강동진; 이현미; 최진영; 나공태; 노태근; 박경규; 김석현
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Publication Year
- 2024-01
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Abstract
- We investigated the export flux of particulate organic carbon (POC) using 234Th as a tracer in the western Indian Ocean along 60°E and 67°E transects in 2017 and 2018. The Seychelles-Chagos Thermocline Ridge (SCTR), where production is relatively high due to nutrient replenishment by upwelling of subsurface water, was observed at 3°S – 12°S in 2017 and 4°S – 13°S both 60°E and 67°E in 2018. POC fluxes in 2017 showed no differences between the SCTR and non-SCTR regions. However, in 2018, the POC fluxes in the SCTR regions (8.52 ± 7.89 mmol C m–2 d–1) were one order of magnitude higher than those observed in the non-SCTR regions (0.63 ± 0.07 mmol C m–2 d–1), which appeared to be related to the strong upwelling of subsurface water. These POC fluxes were comparable to those observed under bloom conditions, and thus, are important for estimating the efficiency of carbon sequestration in the ocean.
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ISSN
- 2296-7745
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/45260
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DOI
- 10.3389/fmars.2023.1288422
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Bibliographic Citation
- Frontiers in Marine Science, v.10, 2024
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Publisher
- Frontiers Media S.A.
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Keywords
- POC export flux; Indian Ocean; SCTR, thorium-234; particulate organic carbon
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Type
- Article
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Language
- English
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Document Type
- Article
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