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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, Lianbao1,2,4; Song, Xiuxian1,2,3,4; Yuan, Yongquan1,2,4; Wang, Wentao1,2,4; Cao, Xihua1,2,4; Wu, Zaixing1,2,4; Yu, Zhiming1,2,3,4
2020-10-01
Source PublicationENVIRONMENTAL POLLUTION
ISSN0269-7491
Volume265Pages:14
Corresponding AuthorSong, Xiuxian(songxx@qdio.ac.cn)
AbstractHypoxia 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.
KeywordHypoxia Annual variations Changjiang Estuary Stratification Nearshore Kuroshio branch current
DOI10.1016/j.envpol.2020.115066
Indexed BySCI
Language英语
Funding ProjectMarine 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 Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000564562000014
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/168526
Collection海洋生态与环境科学重点实验室
Corresponding AuthorSong, Xiuxian
Affiliation1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China
First Author AffilicationKey Laboratory of Marine Ecology & Environmental Sciences, CAS;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Marine Ecology & Environmental Sciences, CAS;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
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.
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