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学科主题: Oceanography
题名: Inorganic carbon parameters responding to summer hypoxia outside the Changjiang Estuary and the related implications
作者: [Chen Jianfang ; Jin Haiyan] SOA, Inst Oceanog 2, State Key Lab Satellite Ocean Environm Dynam, Hangzhou 310012, Zhejiang, Peoples R China ; [Wang Bin ; Chen Jianfang ; Jin Haiyan ; Li Hongliang] SOA, Inst Oceanog 2, Lab Marine Ecosyst & Biogeochem, Hangzhou 310012, Zhejiang, Peoples R China ; [Xu Jie] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Marine Environm Dynam, Guangzhou 510301, Guangdong, Peoples R China
通讯作者: jfchen@sio.org.cn
关键词: dissolved inorganic carbon (DIC) ; biological uptake ; hypoxia ; coastal acidification
刊名: JOURNAL OF OCEAN UNIVERSITY OF CHINA
发表日期: 2013
卷: 12, 期:4, 页:568-576
部门归属: LTO
资助者: This work was jointly supported by the National Basic Research Program of China (973 program, No. 2010CB 428903), Public Science and Technology Research Funds the Projects of Ocean (No. 201105014), National Natural Science Foundation of China (No. 41203085) and the Fundamental Research Funds for the Second Institute of Oceanography, SOA (JT0906). We thank Daji Huang and his group for providing temperature and salinity data. The crew of R/V Beidou provided much help during the sampling cruise. We thank the assistance of Zilin LIU, Yanqing XU, Yanpei ZHUANG, Xizhen LIU for the data collection. Special thanks to Baoshan Chen for his advice on CO2 chemistry calculation.
摘要: The eutrophication, hypoxia and coastal acidification are attracting more and more attention. In this study, inorganic carbon parameters, including dissolved inorganic carbon (DIC), total alkalinity (TA) and calculated partial pressure of CO2 (pCO(2)), obtained from a summer cruise in August, 2009, were used to investigate their integrated response to biological processes accompanying the oxygen depletion in the areas off the Changjiang Estuary. According to the observations, the typical hypoxia occurred in the bottom water just outside the Changjiang Estuary with Dissolved Oxygen (DO) lower than 2.00 mg L-1. The biological uptake in the surface water and the decomposition of organic matter in the bottom water were fully coupled with each other. The high concentration of Chl_a (Chl_a = 10.9 mu g L-1) and DO (9.25 mg L-1), profoundly decreased DIC concentration (1828 mu mol kg(-1)) and elevated pH (8.42) was observed in the surface water. The correspondingly increased DIC and depletion of oxygen were observed in the bottom water. The semi-quantitative analysis proved that the locally-produced phytoplankton, determined by primary productivity, was deposited to the bottom and contributed about 76% of total amount of the organic carbon decomposition in the bottom. However, in the bottom hypoxia (DO = 2.05 mg L-1) area observed in the Southern Zhejiang coastal water, the responding patterns of inorganic carbon parameters deviated from the previous one. The expanding of Changjiang Diluted Water (CDW), the adding of Hangzhou Bay water (with high DIC concentration) and Coastal Current together modify the DIC background value in this area, and the local degeneration and upwelling process may also help to offset the local DIC removed by net biological uptake in surface water. In addition, when the mixing occurring in autumn, which may break the summer stratification, the excess release of high DIC in the bottom water to the subsurface water could have an important influence on coastal acidification and the CO2 uptake capacity in this area.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000326193700006
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10869
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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[Chen Jianfang; Jin Haiyan] SOA, Inst Oceanog 2, State Key Lab Satellite Ocean Environm Dynam, Hangzhou 310012, Zhejiang, Peoples R China; [Wang Bin; Chen Jianfang; Jin Haiyan; Li Hongliang] SOA, Inst Oceanog 2, Lab Marine Ecosyst & Biogeochem, Hangzhou 310012, Zhejiang, Peoples R China; [Xu Jie] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Marine Environm Dynam, Guangzhou 510301, Guangdong, Peoples R China.Inorganic carbon parameters responding to summer hypoxia outside the Changjiang Estuary and the related implications,JOURNAL OF OCEAN UNIVERSITY OF CHINA,2013,12(4):568-576
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