Riverine fluxes of dissolved inorganic nitrogen may be underestimated in gated estuaries: influence of suspended sediments

Chenglong HAN; Lichun PU; Shiyu WANG; Rolf D. VOGT; Xueqiang LU

doi:10.1007/s00343-025-4303-1

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Riverine fluxes of dissolved inorganic nitrogen may be underestimated in gated estuaries: influence of suspended sediments

Chemistry | Updated：2025-12-16

- Riverine fluxes of dissolved inorganic nitrogen may be underestimated in gated estuaries: influence of suspended sediments
- Journal of Oceanology and Limnology Vol. 43, Issue 6, Pages: 1809-1825(2025)
- Affiliations：
  
  1.Tianjin Key Laboratory of Environmental Technology for Complex Trans-media Pollution, Tianjin International Joint Research Center for Environmental Biogeochemical Technology, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
  2.Norwegian Institute for Water Research, Oslo 0579, Norway
- Author bio：
  
  luxq@nankai.edu.cn
- Funds：
- DOI：10.1007/s00343-025-4303-1
  CLC：
- Received：14 November 2024，
  
  Online First：24 January 2025，
  
  Published：01 November 2025
- Accepted：
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HAN Chenglong,PU Lichun,WANG Shiyu,et al.Riverine fluxes of dissolved inorganic nitrogen may be underestimated in gated estuaries: influence of suspended sediments[J].Journal of Oceanology and Limnology,2025,43(06):1809-1825.
DOI：

HAN Chenglong,PU Lichun,WANG Shiyu,et al.Riverine fluxes of dissolved inorganic nitrogen may be underestimated in gated estuaries: influence of suspended sediments[J].Journal of Oceanology and Limnology,2025,43(06):1809-1825. DOI： 10.1007/s00343-025-4303-1.

摘要

Abstract

The flux of dissolved inorganic nitrogen (DIN)

predominantly nitrate (

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) and ammonium (

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)

from land to coastal waters via rivers is commonly estimated simply by multiplying water flux with nitrogen concentration. Understanding DIN fluxes in gated estuaries is critical as these systems often serve as hotspots for nutrient transformations

influencing coastal water quality and ecosystem health. However

the subsequent interactions involving

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and

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adsorption or desorption on suspended sediments are often overlooked. To better understand the impact of these interactions on the overall

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5.67266655

and

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sorption or desorption and subsequently

the mobility and transport to the coastal zone

we conducted a series of

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and

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adsorption and desorption experiments. These experiments involved varying suspended sediment concentrations

particle sizes

salinities

and sea-salt ions to assess their potential effects. Results indicate that desorption of

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and

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from suspended sediments is more prominent than adsorption

with

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desorption being particularly significant.

Notably

at low suspended particle concentrations and high salinity

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desorption from sediments increased markedly

which further amplified in polyhaline conditions. This effect could result from ion pairing between

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and seawater anions

along with competition from seawater cations for sediment cation exchange sites

enhancing

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diffusion from estuarine sediments

and the elevated

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release could promote DIN transport to nearshore waters

especially in gated estuaries where sediment resuspension occurs. Given the critical role of

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in estuarine nitrogen cycling

ignoring these dynamics could lead to underestimations of DIN transport in river-estuary systems. Therefore

incorporating sediment dynamics into DIN flux estimations is crucial for accurately assessing nitrogen transport in gated estuaries.

关键词

Keywords

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