Tracing the contributions of different nitrate sources associated with submarine groundwater discharge in coastal seawaters off Jeju Island, Korea
SCIE
SCOPUS
Cited 0 time in
WEB OF SCIENCE
Cited 0 time in
Scopus
-
Title
- Tracing the contributions of different nitrate sources associated with submarine groundwater discharge in coastal seawaters off Jeju Island, Korea
-
Author(s)
- Park, Jihyun; Kim, Guebuem; Kim, Tae-Hoon; Rho, Tae Keun; Son, Purena
- KIOST Author(s)
- Rho, Tae Keun(노태근); Son, Purena(손푸르나)
-
Alternative Author(s)
- 노태근; 손푸르나
-
Publication Year
- 2024-04
-
Abstract
- We measured the concentrations of dissolved inorganic nutrients and the dual isotopic composition of nitrate (δ15N-NO3− and δ18O-NO3−) in coastal waters off Jeju, a volcanic island in Korea, to trace its main sources. Sampling of seawater and fresh groundwater was conducted in four different coastal areas of Jeju Island: Haengwon (HW), Pyoseon (PS), Ilgwa (IG), and Sagye (SG) in May 2020 and 2021. The significant negative correlations between NO3− and salinity in the four areas indicate that the main source of NO3− is fresh submarine groundwater discharge (FSGD), with the extrapolated fresh groundwater endmember values ranging from 170 to 300 μM (δ15N-NO3−: 4.1–10.8 and δ18O-NO3−: 1.7–6.4). The actual sources of SGD-driven NO3− in these coastal waters were determined using a bi-plot diagram (δ15N-NO3− vs. δ18O-NO3−) and a Bayesian stable isotope mixing model (MixSIAR). The results showed that, besides the background contribution from open-ocean waters, the main sources of NO3− in HW were fertilizer (69 ± 5%) and manure and sewage (24 ± 7%) and those in PS, IG, and SG were manure and sewage (PS: 53 ± 11%, IG: 57 ± 12%, SG: 63 ± 13%) and fertilizer (PS: 27 ± 8%, IG: 24 ± 5%, SG: 22 ± 5%). Our extrapolation approach for NO3− dual isotopes provides a better way to evaluate the main sources of NO3− in coastal waters off volcanic islands where SGD-driven NO3− is significant, but its actual source groundwater cannot be located. © 2024 Elsevier B.V.
-
ISSN
- 0304-4203
-
URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/45472
-
DOI
- 10.1016/j.marchem.2024.104382
-
Bibliographic Citation
- Marine Chemistry, v.261, 2024
-
Publisher
- Elsevier BV
-
Keywords
- Nitrate stable isotopes; Submarine groundwater discharge; Coastal ocean; Nitrate pollution
-
Type
- Article
-
Language
- English
-
Document Type
- Article
- Files in This Item:
-
There are no files associated with this item.
Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.