Nutrient fluxes in the Changjiang River estuary and adjacent waters — a modified box model approach

Xiaohong Wang; Zhiming Yu; Wei Fan; Xiuxian Song; Xihua Cao; Yongquan Yuan

doi:10.1007/s00343-015-4061-6

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Nutrient fluxes in the Changjiang River estuary and adjacent waters — a modified box model approach

Updated：2023-05-16

- Nutrient fluxes in the Changjiang River estuary and adjacent waters — a modified box model approach
- Journal of Oceanology and Limnology Vol. 33, Issue 1, Pages: 176-193(2015)
- Affiliations：
  
  1. Key Laboratory of Marine Ecology and Environmental Science Institute of Oceanology Chinese Academy of Sciences
  2. University of Chinese Academy of Sciences
  3. College of Environment and Safety Engineering Qingdao University of Science and Technology
  4. Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-015-4061-6
  CLC：
- Online First：27 October 2014，
  
  Published：2015
- Accepted：
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Wang, X., Yu, Z., Fan, W. et al. Nutrient fluxes in the Changjiang River estuary and adjacent waters — a modified box model approach., Chin. J. Ocean. Limnol. 33, 176–193 (2015). https://doi.org/10.1007/s00343-015-4061-6
DOI：

Wang, X., Yu, Z., Fan, W. et al. Nutrient fluxes in the Changjiang River estuary and adjacent waters — a modified box model approach., Chin. J. Ocean. Limnol. 33, 176–193 (2015). https://doi.org/10.1007/s00343-015-4061-6 DOI：

摘要

Abstract

To solve nutrient flux and budget among waters with distinct salinity difference for water-salt-nutrient budget

a traditional method is to build a stoichiometrically linked steady state model. However

the traditional way cannot cope appropriately with those without distinct salinity difference that parallel to coastline or in a complex current system

as the results would be highly affected by box division in time and space

such as the Changjiang (Yangtze) River estuary (CRE) and adjacent waters (30.75°2–31.75°N

122°10′–123°20′E). Therefore

we developed a hydrodynamic box model based on the traditional way and the regional oceanic modeling system model (ROMS). Using data from four cruises in 2005

horizontal

vertical and boundary nutrient fluxes were calculated in the hydrodynamic box model

in which flux fields and the major controlling factors were studied. Results show that the nutrient flux varied greatly in season and space. Water flux outweighs the nutrient concentration in horizontal flux

and upwelling flux outweighs upward diffusion flux in vertical direction (upwelling flux and upward diffusion flux regions overlap largely all the year). Vertical flux in spring and summer are much greater than that in autumn and winter. The maximum vertical flux for DIP (dissolved inorganic phosphate) occurs in summer. Additional to the fluxes of the Changjiang River discharge

coastal currents

the Taiwan Warm Current

and the upwelling

nutrient flux inflow from the southern Yellow Sea and outflow southward are found crucial to nutrient budgets of the study area. Horizontal nutrient flux is controlled by physical dilution and confined to coastal waters with a little into the open seas. The study area acts as a conveyer transferring nutrients from the Yellow Sea to the East China Sea in the whole year. In addition

vertical nutrient flux in spring and summer is a main source of DIP. Therefore

the hydrodynamic ROMS-based box model is superior to the traditional one in estimating nutrient fluxes in a complicated hydrodynamic current system and provides a modified box model approach to material flux research.

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