Main factors dominating the development, formation and dissipation of hypoxia off the Changjiang Estuary (CE) and its adjacent waters, China

doi:10.1016/j.envpol.2020.115066

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	Main factors dominating the development, formation and dissipation of hypoxia off the Changjiang Estuary (CE) and its adjacent waters, China
	Chi, Lianbao 1,2,4; Song, Xiuxian 1,2,3,4; Yuan, Yongquan 1,2,4; Wang, Wentao 1,2,4; Cao, Xihua 1,2,4; Wu, Zaixing 1,2,4; Yu, Zhiming 1,2,3,4
刊名	ENVIRONMENTAL POLLUTION
	2020-10-01
卷号	265 页码:14
关键词	Hypoxia Annual variations Changjiang Estuary Stratification Nearshore Kuroshio branch current
ISSN号	0269-7491
DOI	10.1016/j.envpol.2020.115066
通讯作者	Song, Xiuxian(songxx@qdio.ac.cn)
英文摘要	Hypoxia off the Changjiang Estuary (CE) and its adjacent waters is purported to be the most severe in China, attracting considerable concern from both the scientific community and the general public. Currently, continuous observations of dissolved oxygen (DO) levels covering hypoxia from its appearance to disappearance are lacking. In this study, twelve consecutive monthly cruises (from February 2015 to January 2016) were conducted. The consecutive spatiotemporal variations in hypoxia throughout the annual cycle were elucidated in detail, and the responses of annual variations in hypoxia to the different influential factors were explored. Overall, hypoxia experienced a consecutive process of expanding from south to north, then disappearing from north to south. The annual variations in hypoxia were mainly contingent on stratification variations. Among different stages, there was significant heterogeneity in the dominant factors. Specifically, low-DO waters initially appeared from the intrusion of nearshore Kuroshio branch current (NKBC), as NKBC intrusion provided a low-DO background and triggered stratification. Thereafter, stratification was enhanced and gradually expanded northward, which promoted the extension of low-DO areas. The formation of hypoxia was regionally selective, and more intense organic matter decomposition at local regions facilitated the occurrence and discontinuous distribution of hypoxia. Hypoxic zones were observed at the Changjiang bank and Zhejiang coastal region from August (most extensively at 14,800 km(2)) to October. Thereafter, increased vertical mixing facilitated the dissipation of hypoxia from north to south. (C) 2020 Elsevier Ltd. All rights reserved.
资助项目	Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao)[2018SDKJ0504-2] ; Taishan Scholars Climbing Program of Shandong Province of 2019 ; AoShan Talents Cultivation Program by Qingdao National Laboratory for Marine Science and Technology[2017ASTCP-OS16]
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000564562000014
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/168525]
专题	海洋研究所_海洋生态与环境科学重点实验室
通讯作者	Song, Xiuxian
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China
推荐引用方式 GB/T 7714	Chi, Lianbao,Song, Xiuxian,Yuan, Yongquan,et al. Main factors dominating the development, formation and dissipation of hypoxia off the Changjiang Estuary (CE) and its adjacent waters, China[J]. ENVIRONMENTAL POLLUTION,2020,265:14.
APA	Chi, Lianbao.,Song, Xiuxian.,Yuan, Yongquan.,Wang, Wentao.,Cao, Xihua.,...&Yu, Zhiming.(2020).Main factors dominating the development, formation and dissipation of hypoxia off the Changjiang Estuary (CE) and its adjacent waters, China.ENVIRONMENTAL POLLUTION,265,14.
MLA	Chi, Lianbao,et al."Main factors dominating the development, formation and dissipation of hypoxia off the Changjiang Estuary (CE) and its adjacent waters, China".ENVIRONMENTAL POLLUTION 265(2020):14.