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Contribution of sediment oxygen demand to hypoxia development off the Changjiang Estuary
Zhang, Haiyan1; Zhao, Liang2; Sun, Yao3; Wang, Jianing4; Wei, Hao5
2017-06-05
Source PublicationESTUARINE COASTAL AND SHELF SCIENCE
Volume192Pages:149-157
SubtypeArticle
AbstractThis study evaluates the contribution of sediment oxygen demand (SOD) to hypoxia development off the Changjiang Estuary based on SOD measurements from onboard chamber incubations and numerical experiments. Onboard core incubations were conducted for samples collected from four stations in the Yellow Sea (YS) and the East China Sea (ECS) during cruises in June, August and October 2006. The measured SOD ranges widely from 9.1 to 62.5 mmol O-2 m(-2) d(-1) with a mean rate of 22.6 +/- 16.4 mmol O-2 m(-2) d(-1), and the maximum occurring in August. The rates in regions experiencing hypoxia vary from 13.5 to 24.0 mmol O-2 m(-2) d(-1) with a mean of 18.9 +/- 4.6 mmol O-2 m(-2) d(-1). Additionally, the vertical oxygen flux was calculated from profile measurements at a hypoxic mooring station adjacent to the Changjiang Estuary on September 3rd. and 4th, 2006. The oxygen flux across the pycnocline was about 3.1 mmol O-2 m(-2) d(-1), much lower than the SOD, implying that the low oxygen supply associated with stratification promotes the formation and maintenance of hypoxia in bottom waters. The one-dimensional numerical experiments configured for stratified and well-mixed water columns further confirm that stratification is necessary for the development and persistence of hypoxia, while SOD is a major oxygen sink below the pycnocline. Integrated over June to August, the amount of oxygen loss beneath the pycnocline due to SOD is equal to 116%-148%, 80%-142% and 82%-179% of the total net oxygen loss in the southern hypoxic region, northern hypoxic region and the middle shelf, respectively. During June to August when hypoxia develops, SOD in the northern and southern regions has similar magnitude. The Changjiang Diluted Water (CDW) promotes hypoxia formation in both regions, while the oxygen advection caused by the Taiwan Warm Current (TWC) would alleviate hypoxia formation especially for the southern hypoxic region. (C) 2017 Elsevier Ltd. All rights reserved.
KeywordSediment Oxygen Demand Hypoxia Diffusive Oxygen Flux Changjiang Estuary
DOI10.1016/j.ecss.2017.05.006
Indexed BySCI
Language英语
WOS IDWOS:000403987200012
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/137146
Collection海洋环流与波动重点实验室
实验海洋生物学重点实验室
Affiliation1.Ocean Univ China, Key Lab Phys Oceanog, Qingdao 266100, Peoples R China
2.Tianjin Univ Sci & Technol, Coll Marine & Environm Sci, Tianjin 300457, Peoples R China
3.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266100, Peoples R China
4.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao 266100, Peoples R China
5.Tianjin Univ, Sch Marine Sci & Technol, Tianjin 300072, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Haiyan,Zhao, Liang,Sun, Yao,et al. Contribution of sediment oxygen demand to hypoxia development off the Changjiang Estuary[J]. ESTUARINE COASTAL AND SHELF SCIENCE,2017,192:149-157.
APA Zhang, Haiyan,Zhao, Liang,Sun, Yao,Wang, Jianing,&Wei, Hao.(2017).Contribution of sediment oxygen demand to hypoxia development off the Changjiang Estuary.ESTUARINE COASTAL AND SHELF SCIENCE,192,149-157.
MLA Zhang, Haiyan,et al."Contribution of sediment oxygen demand to hypoxia development off the Changjiang Estuary".ESTUARINE COASTAL AND SHELF SCIENCE 192(2017):149-157.
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