Inter-annual variations of dissolved oxygen and hypoxia off the northern Changjiang River(Yangtze River)Estuary in summer from 1997 to 2014

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外文摘要：Hypoxia off the Changjiang River Estuary has been the subject of much attention,yet systematic observations have been lacking,resulting in a lack of knowledge regarding its long-term change and drivers.By revisiting the repeated surveys of dissolved oxygen(DO)and other relevant hydrographic parameters along the section from the Changjiang River Estuary to the Jeju-do in the summer from 1997 to 2014,rather different trends were revealed for the dual low-DO cores.The nearshore low-DO core,located close to the river mouth and relatively stable,shows that hypoxia has become more severe with the lowest DO descending at a rate of-0.07 mg/(L·a)and the thickness of low-DO zone rising at a rate of 0.43 m/a.The offshore core,centered around 40-m isobath but moving back and forth between 123.5°-125°E,shows large fluctuations in the minimum DO concentration,with the thickness of low-DO zone falling at a rate of-1.55 m/a.The probable factors affecting the minimum DO concentration in the two regions also vary.In the nearshore region,the decreasing minimum DO is driven by the increase in both stratification and primary productivity,with the enhanced extension of the Changjiang River Diluted Water(CDW)strengthening stratification.In the offshore region,the fluctuating trend of the minimum DO concentration indicates that both DO loss and DO supplement are distinct.The DO loss is primarily attributed to bottom apparent oxygen utilization caused by the organic matter decay and is also relevant to the advection of low-DO water from the nearshore region.The DO supplement is primarily due to weakened stratification.Our analysis also shows that the minimum DO concentration in the nearshore region was extremely low in 1998,2003,2007 and 2010,related to El Niño signal in these summers.

外文关键词：

dissolved oxygenlow-DOChangjiang River Estuaryinterannual variationsdual-core

作者：

Anqi Liu、Feng Zhou、Xiao Ma、Qiang Zhao、Guanghong Liao、Yuntao Zhou、Di Tian、Xiaobo Ni、Ruibin Ding

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作者单位：

College of Oceanography,Hohai University,Nanjing 210098,China

State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China

Observation and Research Station of Changjiang River Delta Marine Ecosystems,Ministry of Natural Resources,Zhoushan 316022,China

Ningbo Marine Center,Ministry of Natural Resources,Ningbo 315000,China

School of Oceanography,Shanghai Jiao Tong University,Shanghai 200240,China

Institute of Polar and Ocean Technology,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China

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基金：

National Key Research & Development Program of ChinaNational Key Research & Development Program of ChinaNational Natural Science Foundation of ChinaScientific Research Fund of the Second Institute of Oceanography,Ministry of Natural ResourcesNational Programme on Global Change and Air-Sea Interaction Phase ⅡZhejiang Provincial Ten Thousand Talents ProgramProject of State Key Laboratory of Satellite Ocean Environment Dynamics

项目编号：

2023YFC31080032023YFC310800041876026YJJC2201GASI-01-CJK2020R52038SOEDZZ2105

出版年：

2024

DOI：

10.1007/s13131-023-2244-0

海洋学报(英文版)

中国海洋学会

海洋学报(英文版)

CSTPCD

影响因子：0.323

ISSN：0253-505X

年,卷(期)：2024.43(6)