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Sci Rep. 2018 Aug 24;8(1):12768. doi: 10.1038/s41598-018-31105-1.

Significant and conservative long-range transport of dissolved organic nutrients in the Changjiang diluted water.

Author information

1
School of Earth and Environmental Sciences/Research Institute of Oceanography, Seoul National University, Seoul, 08826, Republic of Korea.
2
School of Earth and Environmental Sciences/Research Institute of Oceanography, Seoul National University, Seoul, 08826, Republic of Korea. gkim@snu.ac.kr.
3
Ocean Climate and Ecology Research Division, National Institute of Fisheries Science, Busan, 46083, Republic of Korea.
4
Department of Earth and Marine Sciences, Jeju National University, Jeju, 63243, Republic of Korea.

Abstract

The Changjiang River is one of the main nutrient sources in the northwestern Pacific marginal seas. However, most of the previous studies have neglected the long-range transport (>200 km) of riverine nutrients since they are rapidly consumed. In this study, we examined the long-range transport (200-800 km) of nutrients in the surface layer during the summer of 2017. The plots of nutrients against salinity display that dissolved organic nitrogen (DON) was conservative over ~800 km, while more than 99% of the dissolved inorganic nitrogen (DIN) was removed within 200 km. As a result, in the study region, DON concentrations (avg. 7.0 ± 1.3 µM), which are minor in the river water, were much higher than DIN concentrations (avg. 0.28 ± 0.26 µM). Both nutrients, N and P, showed a similar pattern. Our results suggest that dissolved organic nutrients play a critical role on the long-range transport of riverine nutrients in surface waters and subsequent ecosystem changes.

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