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Long-term variation of nitrate in the East Sea, Korea

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Abstract

Long-term variation of nitrate in the East Sea was monitored in order to investigate impact of Three Gorges Dam (TGD) in the Changjiang River’s upstream, China and Nakdong River’s estuary dam, Korea. Tracing source of nitrate was another objective in this study. For this study, nutrient data were collected for 20 years from 1999 to 2018 in the East Sea, and divided into 4 sections, and evaluated whether a significant difference exists among the averages of nitrate concentrations. The concentrations of nitrate were affected by the major rivers (the Nakdong and the Taehwa Rivers) and Tsushima Warm Current (TWC) which diverged from the Kuroshio Current passing through East China Sea (ECS). Our results also indicated that long-term nitrate concentrations decreased and its reasons. First, the construction of TGD in the upstream of the Changjiang River may have resulted in the decrease of the nitrate supply in the river and ECS which is carried by TWC, toward the East Sea. Second, decrease in the nitrate flux of the Nakdong River’s estuary due to the construction of the estuary dam and sewer treatment plant could also be a factor for the nitrate decrease in the East Sea. Therefore, anthropogenic activities from the Nakdong River and Changjiang River had a long-term effect on the East Sea’s nitrate concentrations. The amount of nitrate runoff reduced by the anthropogenic activities influenced the nitrate levels over a long period by the flow of currents in the East Sea.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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  1. Department of Biosystems and Convergence Engineering, Catholic Kwandong Univeristy, Gangneung, 25601, Korea

    Moo Joon Shim & Yi Yong Yoon

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  1. Moo Joon Shim
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Shim, M.J., Yoon, Y.Y. Long-term variation of nitrate in the East Sea, Korea. Environ Monit Assess 193, 720 (2021). https://doi.org/10.1007/s10661-021-09425-z

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