Nitrate in the Changjiang diluted water: an isotopic evaluation on sources and reaction pathways

Shan JIANG; Jie JIN; Guosen ZHANG; Yan CHANG; Zhaoru ZHANG; Meng ZHOU; Xiaolu WANG; Jing ZHANG; Ying WU

doi:10.1007/s00343-020-0149-8

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Nitrate in the Changjiang diluted water: an isotopic evaluation on sources and reaction pathways

Chemistry | Updated：2023-05-20

- Nitrate in the Changjiang diluted water: an isotopic evaluation on sources and reaction pathways
- Journal of Oceanology and Limnology Vol. 39, Issue 3, Pages: 830-845(2021)
- Affiliations：
  
  1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
  2.School of Oceanography, Shanghai Jiao Tong University, Shanghai 200240, China
- Author bio：
  
  Shan JIANG, E-mail: sjiang@sklec.ecnu.edu.cn
- Funds：
- DOI：10.1007/s00343-020-0149-8
  CLC：
- Received：07 April 2020，
  
  Accepted：18 May 2020，
  
  Online First：14 July 2020，
  
  Published：2021-05
- Accepted：
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Shan JIANG, Jie JIN, Guosen ZHANG, et al. Nitrate in the Changjiang diluted water: an isotopic evaluation on sources and reaction pathways[J]. Journal of Oceanology and Limnology, 2021, 39(3): 830-845.
DOI：

Shan JIANG, Jie JIN, Guosen ZHANG, et al. Nitrate in the Changjiang diluted water: an isotopic evaluation on sources and reaction pathways[J]. Journal of Oceanology and Limnology, 2021, 39(3): 830-845. DOI： 10.1007/s00343-020-0149-8.

摘要

Abstract

A cruise covering two transects in the Changjiang (Yangtze) estuary in July 2017 was conducted

aiming to explore the sources for riverine NO

and identify reactions involved in the NO

transformations along the transport of the Changjiang diluted water (CDW). In the river water

was fundamentally contributed by chemical fertilizer leakage in the watershed according to isotope signals. Sewage discharge may also be significant on riverine NO

inventory

while the isotope signal was masked by nitrification. Together with the transport of the CDW

production was observed in waters with low salinities (

20) and high turbidities. Nitrification resulted from the mineralization of riverine organic nitrogen; therefore

the high turbidity was linked to active production. In the outer plume

coupled with stratification

a significant decrease in NO

concentration was observed in the surface water. In parallel

enrichment in δ

N-NO

and δ

O-NO

was found

indicating biological consumption by phytoplankton. The difference in the stratification intensity between two transects led to variations in NO

concentrations and isotope compositions. In the benthic water

denitrification (sediment-water interface) and nitrification (bottom water) coexisted. Furthermore

accumulations of NH

and dissolved organic nitrogen in the bottom water were observed

indicating that nitrification was constrained by oxidant (mainly dissolved oxygen) supplies.

关键词

Keywords

references

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