Seasonal variability in dissolved oxygen in the Bohai Sea, China

Yaozu CHEN; Fangguo ZHAI; Yanzhen GU; Jing CAO; Cong LIU; Xingchuan LIU; Zizhou LIU; Peiliang LI

doi:10.1007/s00343-021-0235-6

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Seasonal variability in dissolved oxygen in the Bohai Sea, China

Physics | Updated：2023-04-27

- Seasonal variability in dissolved oxygen in the Bohai Sea, China
- Journal of Oceanology and Limnology Vol. 40, Issue 1, Pages: 78-92(2022)
- Affiliations：
  
  1.School of Marine Sciences, Sun Yat-Sen University, Zhuhai 519082, China
  2.College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
  3.North China Sea Environmental Monitoring Center, State Oceanic Administration, Qingdao 266000, China
  4.Institute of Physical Oceanography and Remote Sensing, Ocean College, Zhejiang University, Zhoushan 316021, China
  5.Hainan Institute of Zhejiang University, Sanya 572024, China
- Author bio：
  
  Yanzhen GU, E-mail: guyanzhen@ouc.edu.cn
  Jing CAO, E-mail: caojing@ncs.mnr.gov.cn
- Funds：
- DOI：10.1007/s00343-021-0235-6
  CLC：
- Received：17 June 2020，
  
  Accepted：15 September 2020，
  
  Online First：15 January 2021，
  
  Published：2022-01
- Accepted：
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Yaozu CHEN, Fangguo ZHAI, Yanzhen GU, et al. Seasonal variability in dissolved oxygen in the Bohai Sea, China[J]. Journal of Oceanology and Limnology, 2022, 40(1): 78-92.
DOI：

Yaozu CHEN, Fangguo ZHAI, Yanzhen GU, et al. Seasonal variability in dissolved oxygen in the Bohai Sea, China[J]. Journal of Oceanology and Limnology, 2022, 40(1): 78-92. DOI： 10.1007/s00343-021-0235-6.

摘要

Abstract

Deoxygenation has frequently appeared in coastal ecosystems over the past century due to the joint influence of increasing anthropogenically induced nutrient inputs and global warming. The semi-enclosed Bohai Sea is a typical system that is prone to deoxygenation

with regular hypoxia events consistently recorded in recent decades. Based on in-situ observation data collected in large-scale voyage surveys in the Bohai Sea during 2008–2017

the seasonal variability in dissolved oxygen (DO) and its controlling mechanisms were studied. The results indicated that in spring and autumn

the DO distributions exhibited similar spatial patterns in the surface and bottom layers

while in summer

its spatial distribution was characterized by large-scale oxygen-poor zones distributed off the Qinhuangdao Coast and the central southern Bohai Sea in the bottom layer. The controlling mechanisms of the DO distribution varied from season to season. Spring and autumn DO distributions were dominated by the seawater temperature. Under the combined effects of stratification and decomposition

the summer bottom DO exhibited dual-core distribution. On the one hand

stratification could greatly impede vertical mixing

resulting in reduced bottom DO replenishment. On the other hand

the increased bottom organic matter intensified the decomposition processes

inducing massive DO consumption and elevated dissolved inorganic nitrogen concentrations. In addition

the stronger stratification might be the reason for the more severe deoxygenation in the southern oxygen-poor zones in summer. Our study provides guidance for an in-depth understanding of the DO seasonality in the Bohai Sea and the mechanisms that modulate it and for the improvement of hypoxia forecasts in ocean models.

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references

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