Impacts of typhoon-induced heavy rainfalls and resultant freshwater runoff on the partitioning of organic carbon oxidation and nutrient dynamics in the intertidal sediments of the Han River estuary, Yellow Sea SCIE SCOPUS

Cited 6 time in WEB OF SCIENCE Cited 7 time in Scopus
Title
Impacts of typhoon-induced heavy rainfalls and resultant freshwater runoff on the partitioning of organic carbon oxidation and nutrient dynamics in the intertidal sediments of the Han River estuary, Yellow Sea
Author(s)
Mok, Jin-Sook; Kim, Sung-Han; Kim, Jonguk; Cho, Hyeyoun; An, Sung-Uk; Choi, Ayeon; Kim, Bomina; Yoon, Cheolho; Thamdrup, Bo; Hyun, Jung-Ho
KIOST Author(s)
Kim, Sung Han(김성한)Kim, Jonguk(김종욱)
Publication Year
2019-11-15
Abstract
Occurrence of typhoons accompanied by heavy precipitation has increased for the past 40 years in northeast Asia. To elucidate the impact of three consecutive typhoon-induced heavy rainfall events and resultant freshwater runoff on the partitioning of organic carbon (C-org) oxidation and nutrient dynamics, we investigated the geochemical constituents, the rate of anaerobic C-org oxidation, sulfate reduction (SR), iron reduction (FeR) and P speciation in the intertidal mud flat of the Han River estuary, Yellow Sea. C-org oxidation by SR and FeR and their metabolic products (Sigma CO2, NH4+ H2S, Fe2+) decreased significantly (P < 0.05) during and immediately after the heavy rainfall. Additional mesocosm experiments demonstrated that potential N-2 production rates increased up to 2.4 times with increased nitrate concentrations during freshwater runoff. The results suggest that denitrification becomes a significant C-org oxidation pathway substituting for SR during high-nitrate freshwater runoff, which may remove substantial portion of the N introduced into the estuary. P speciation analysis further revealed that the concentrations of iron bound P decreased by 2.2 fold during the heavy rainfall compared to that measured before the rainfall. The results suggest that an excess supply of riverine Si keeps P from binding to Fe, thereby stimulating P release. Taking projections of enhanced rainfall events in the future into account, our results suggest that the intensified storm events and resultant rive rine runoff induces a shift of C-org oxidation pathways in the sediments, which ultimately alters C-N-P-S-Fe dynamics and may deepen N-limiting conditions in coastal ecosystems of the Yellow Sea. (C) 2019 Elsevier B.V. All rights reserved.
ISSN
0048-9697
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/461
DOI
10.1016/j.scitotenv.2019.07.031
Bibliographic Citation
SCIENCE OF THE TOTAL ENVIRONMENT, v.691, pp.858 - 867, 2019
Publisher
ELSEVIER
Subject
LOW-TIDE RAINFALL; MACROFAUNAL BURROWS; MARINE SEDIMENT; PHOSPHORUS; SALINITY; REDUCTION; RATES; IRON; SOIL; DENITRIFICATION
Keywords
Typhoon-induced rainfall; Freshwater Rinoff; intertidal sediment; Sulfate reduction; Iron reduction; Nutrient dynamics
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER
Related Researcher
Research Interests

Geochemistry,Submarine hydrothermal system,Deep-sea mineral,지구화학,해저열수시스템,해양광물자원

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