气候变化领域集成服务门户(CCPortal): Low dissolved oxygen in the Pearl River estuary in summer: Long-term spatio-temporal patterns; trends; and regulating factors

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DOI	10.1016/j.marpolbul.2019.110814
	Low dissolved oxygen in the Pearl River estuary in summer: Long-term spatio-temporal patterns; trends; and regulating factors
	Li X.; Lu C.; Zhang Y.; Zhao H.; Wang J.; Liu H.; Yin K.
发表日期	2020
ISSN	0025326X
卷号	151
英文摘要	Several large semi-enclosed seas and coastal bodies have formed seasonal hypoxic water masses over large areas. The dominant cause for such formations is believed to be the increasing inflow of nutrients from watersheds and urban areas into estuaries and coastal waters. Several studies have reported hypoxic events in the Pearl River estuary (PRE). However, hypoxia events appear to be episodic, which are neither seasonal nor estuary-wide. The reasons for such occurrences are not understood fully. The objectives of this study are to use 24-year time series data obtained during 1988–2011 to analyze the long-term variability in dissolved oxygen (DO) in summer over the entire estuary from urban areas to estuarine coastal waters and examine regulating factors for the occurrences of hypoxia. The results showed that various regulating factors were responsible for the variability of DO in different regions of the PRE. DO decreased in the urban reach, upstream and main estuarine zones of the PRE from about 2000. It was hypoxic (DO <2.0 mg L−1) in the urban reach zone and periodic low DO (DO <3.5 mg L−1) and episodic hypoxic in the upstream zone after 2000, mainly influenced by the increasing sewage discharge. The main estuarine zone experienced episodic low DO and sporadic hypoxia after 2000. The ecosystem buffering capacity was characterized by turbidity, well vertical mixing and short residence time which diluted the pressure for the formation of hypoxia. The eastern shelf appeared to be more vulnerable to hypoxia because of its deeper topography, plume front position, and stratification of the water column compared with the western shelf. Its bottom waters experienced seasonal low DO but seldom hypoxia. In comparison, low DO rarely occurred in the western shelf because of its shallow topography and short residence time. In brief, 24-year series data captured from 1988 to 2011 showed a lack of seasonal and estuary-wide hypoxia in the PRE. © 2019
英文关键词	Dissolved oxygen; Hypoxia; Pearl River estuary; Regulating factors
语种	英语
scopus关键词	Discharge (fluid mechanics); Dissolution; Estuaries; Gems; Rivers; Sewage; Topography; Buffering capacities; Estuarine coastal; Hypoxia; Long-term variability; Low dissolved oxygen; Pearl River estuary; Regulating factors; Spatiotemporal patterns; Dissolved oxygen; dissolved oxygen; water; oxygen; dissolved oxygen; hypoxia; marine pollution; numerical model; regulatory approach; sewage disposal; spatiotemporal analysis; time series analysis; trend analysis; Article; coastal waters; environmental factor; estuary; hypoxia; river; sewage disposal; summer; topography; turbidity; urban area; China; ecosystem; environmental monitoring; sea; season; China; Guangdong; Zhujiang Estuary; China; Ecosystem; Environmental Monitoring; Estuaries; Oceans and Seas; Oxygen; Rivers; Seasons
来源期刊	Marine Pollution Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/149285
作者单位	School of Marine Sciences/Guangdong Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-Sen University, Guangzhou, 510275, China; South China Sea Environmental Monitoring Center, State Oceanic Administration, Guangzhou, 510300, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China; National Marine Environmental Monitoring Center, Ministry of Ecology and Environment, Dalian, 116023, China; Department of Ocean Science and Division of Life Science, Hong Kong University of Science and Technology, Hong Kong
推荐引用方式 GB/T 7714	Li X.,Lu C.,Zhang Y.,et al. Low dissolved oxygen in the Pearl River estuary in summer: Long-term spatio-temporal patterns; trends; and regulating factors[J],2020,151.
APA	Li X..,Lu C..,Zhang Y..,Zhao H..,Wang J..,...&Yin K..(2020).Low dissolved oxygen in the Pearl River estuary in summer: Long-term spatio-temporal patterns; trends; and regulating factors.Marine Pollution Bulletin,151.
MLA	Li X.,et al."Low dissolved oxygen in the Pearl River estuary in summer: Long-term spatio-temporal patterns; trends; and regulating factors".Marine Pollution Bulletin 151(2020).