Dual carbon isotope (delta C-13 and Delta C-14) characterization of particulate organic carbon in the Geum and Seomjin estuaries, South Korea
- Authors
- Kang, Sujin; Kim, Jung-Hyun; Ryu, Jong-Sik; Shin, Kyung-Hoon
- Issue Date
- Jan-2020
- Publisher
- Pergamon Press Ltd.
- Keywords
- Particulate organic carbon; Estuary dam; Carbon isotopes; Geum estuary; Seomjin estuary
- Citation
- Marine Pollution Bulletin, v.150, pp.1 - 6
- Indexed
- SCIE
SCOPUS
- Journal Title
- Marine Pollution Bulletin
- Volume
- 150
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/1402
- DOI
- 10.1016/j.marpolbul.2019.110719
- ISSN
- 0025-326X
- Abstract
- We investigated the source, composition, and reactivity of particulate organic carbon (POC) in two contrasting Korean estuary systems, a closed estuary (Geum) (i.e., with an estuary dam at the river mouth) and an open (Seomjin) estuary. A dual isotope (delta C-13(POC) and Delta C-14(POC)) approach was applied to surface water samples collected along a salinity gradient in August 2016. Our results indicate that phytoplankton-derived POC was the main contributor to the total POC pool in the reservoir of the Geum estuary, while terrestrial-derived POC predominated the upper Seomjin estuary. A simple binary mixing model using Delta C-14(POC) revealed a higher modem POC contribution (87-90%) in the Geum estuary reservoir than that (77%) of the upper Seomjin estuary. Accordingly, it appears that an estuary dam can alter the source and reactivity of POC in a reservoir, which can be transferred to the adjacent coastal ecosystem.
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