Effects of dissolved oxygen and nutrients from the Kuroshio on hypoxia off the Changjiang River estuary

Di TIAN; Feng ZHOU; Wenyan ZHANG; Han ZHANG; Xiao MA; Xinyu GUO

doi:10.1007/s00343-021-0440-3

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Effects of dissolved oxygen and nutrients from the Kuroshio on hypoxia off the Changjiang River estuary

Chemistry | Updated：2023-05-20

- Effects of dissolved oxygen and nutrients from the Kuroshio on hypoxia off the Changjiang River estuary
- Journal of Oceanology and Limnology Vol. 40, Issue 2, Pages: 515-529(2022)
- Affiliations：
  
  1.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
  2.Observation and Research Station of Yangtze River Delta Marine Ecosystems, Ministry of Natural Resources, Zhoushan 316022, China
  3.Ocean College, Zhejiang University, Zhoushan 316021, China
  4.Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Geesthacht 21502, Germany
  5.Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai), Zhuhai 519082, China
  6.Center for Marine Environmental Study, Ehime University, Matsuyama 790-8577, Japan
- Author bio：
  
  Feng ZHOU, E-mail: zhoufeng@sio.org.cn
- Funds：
- DOI：10.1007/s00343-021-0440-3
  CLC：
- Received：13 November 2020，
  
  Accepted：28 January 2021，
  
  Online First：18 March 2021，
  
  Published：2022-03
- Accepted：
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Di TIAN, Feng ZHOU, Wenyan ZHANG, et al. Effects of dissolved oxygen and nutrients from the Kuroshio on hypoxia off the Changjiang River estuary[J]. Journal of Oceanology and Limnology, 2022, 40(2): 515-529.
DOI：

Di TIAN, Feng ZHOU, Wenyan ZHANG, et al. Effects of dissolved oxygen and nutrients from the Kuroshio on hypoxia off the Changjiang River estuary[J]. Journal of Oceanology and Limnology, 2022, 40(2): 515-529. DOI： 10.1007/s00343-021-0440-3.

摘要

Abstract

The intrusion of the Kuroshio into the East China Sea (ECS) affects the development of hypoxia off the Changjiang (Yangtze) River estuary; however

quantitative analysis of its impacts is lacking. In this study

the Regional Ocean Modeling Systems (ROMS) model coupled with the Carbon

Silicate and Nitrogen Ecosystem (CoSiNE) model was used to investigate the relative importance of dissolved oxygen (DO) and different nutrients (silicate

nitrate

and phosphate) in the Kuroshio on hypoxia in the ECS. Results show that changes in DO concentrations in the Kuroshio modify the distribution and intensity of hypoxia through direct onshore transport by hydrodynamic processes. An increase in Kuroshio DO concentration by 25% or 50% would result in a decrease of the maximum hypoxia extent (MHE) in the ECS by 76% or 86%

respectively

while a 25% decrease in Kuroshio DO would increase the MHE by up to 219%. The contribution of DO in the Taiwan Strait is almost negligible. In contrast to Kuroshio DO

nutrients affect hypoxia in the ECS through onshore transport by hydrodynamic and biochemical processes. Changes in phosphate and nitrate concentrations by 25% in the Kuroshio would change the MHE by up to 30% and 18%

respectively

accompanied by apparent changes in surface chlorophyll-a concentrations. The effect of silicate on hypoxia is negligible because a 25% change in silicate concentrations in the Kuroshio would result in less than 1% change in the MHE. Our results reveal a hierarchical rank of importance for environmental variables in the Kuroshio (i.e.

DO > phosphate > nitrate > silicate) in modifying the development of hypoxia in the ECS.

关键词

Keywords

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