Eutrophication characteristics in the Jiangsu coastal waters

LU Xin-yu; PENG Mo; ZHOU Chao-fan; ZHAO Yong-gang; JIANG Long

doi:10.12111/j.mes.2021-x-0207

Volume 41 Issue 5

Oct. 2022

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Chinese Journal of MARINE ENVIRONMENTAL SCIENCE > 2022 > 41(5): 745-752. > DOI: 10.12111/j.mes.2021-x-0207

LU Xin-yu, PENG Mo, ZHOU Chao-fan, ZHAO Yong-gang, JIANG Long. Eutrophication characteristics in the Jiangsu coastal waters[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2022, 41(5): 745-752. DOI: 10.12111/j.mes.2021-x-0207

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Eutrophication characteristics in the Jiangsu coastal waters

LU Xin-yu^{1, 2,},
PENG Mo²,
ZHOU Chao-fan²,
ZHAO Yong-gang²,
JIANG Long^{1, 3, 4, ,}

1.
College of Oceanography, Hohai University, Nanjing 210098, China
2.
Jiangsu Environmental Monitoring Center, Nanjing 210019, China
3.
Key Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing 210098, China
4.
Key Laboratory of Ministry of Education for Coastal Disaster and Protection, Hohai University, Nanjing 210098, China

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Received Date: September 23, 2021
Revised Date: January 13, 2022
Accepted Date: January 16, 2022

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Abstract

Abstract

In recent years, water quality degradation in the Jiangsu coastal waters has led to frequent harmful algal blooms known as the red and green tides. Eutrophication is considered as one of the potential causes. In order to study eutrophication characteristics in this region, the monitored water quality parameters such as dissolved inorganic nitrogen (DIN), soluble reactive phosphorus (SRP), and chlorophyll a in 2019 and 2020 were analyzed spatially and integrated as various eutrophication indices. Results indicate that DIN and SRP concentrations in the Jiangsu coastal waters were relatively high nearshore and significantly negatively correlated with salinity. Due to higher precipitation and river runoff, nutrient and chlorophyll a concentrations were higher in summer than in spring and fall, and in the wet (2020) than normal (2019) year. Based on these findings, we conclude that the terrestrial input likely exerts a major control on eutrophication of the Jiangsu coastal sea. Monitoring and load management of the riverine pollution are key to water quality improvement in this region.
- Jiangsu coastal waters,
- nutrients,
- eutrophication,
- spatiotemporal variability,
- terrestrial input

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