Eutrophication-Driven Hypoxia in the East China Sea off the Changjiang Estuary
Coastal hypoxia is an increasingly recognized environmental issue of global concern to both the scientific community and the general public. We assessed the relative contributions from marine and terrestrially sourced organic matter that were responsible for oxygen consumption in a well-studied seas...
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| Veröffentlicht in: | Environmental science & technology 2016-03, Vol.50 (5), p.2255-2263 |
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| creator | Wang, Hongjie Dai, Minhan Liu, Jinwen Kao, Shuh-Ji Zhang, Chao Cai, Wei-Jun Wang, Guizhi Qian, Wei Zhao, Meixun Sun, Zhenyu |
| description | Coastal hypoxia is an increasingly recognized environmental issue of global concern to both the scientific community and the general public. We assessed the relative contributions from marine and terrestrially sourced organic matter that were responsible for oxygen consumption in a well-studied seasonal coastal hypoxic zone, the East China Sea off the Changjiang Estuary. Our fieldwork was conducted in August 2011 during reinstatement of a subsurface hypoxia, when we observed a continuous decline of dissolved oxygen along with production of dissolved inorganic carbon resulting from organic carbon remineralization. On the basis of a three end-member mixing model and determinations of the stable isotopic compositions of dissolved inorganic carbon (δ13CDIC), the end product of particulate organic carbon (POC) degradation, we quantified the δ13C value of the remineralized organic carbon (δ13COCx), which was −18.5 ± 1.0‰. This isotopic composition was very similar to the δ13C of marine sourced POC produced in situ (−18.5 ± 0.3‰) rather than that of the terrestrially sourced POC (−24.4 ± 0.2‰). We concluded that marine-sourced organic matter, formed by eutrophication-induced marine primary production, was the dominant oxygen consumer in the subsurface hypoxic zone in the East China Sea off the Changjiang Estuary. |
| doi_str_mv | 10.1021/acs.est.5b06211 |
| format | Article |
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We assessed the relative contributions from marine and terrestrially sourced organic matter that were responsible for oxygen consumption in a well-studied seasonal coastal hypoxic zone, the East China Sea off the Changjiang Estuary. Our fieldwork was conducted in August 2011 during reinstatement of a subsurface hypoxia, when we observed a continuous decline of dissolved oxygen along with production of dissolved inorganic carbon resulting from organic carbon remineralization. On the basis of a three end-member mixing model and determinations of the stable isotopic compositions of dissolved inorganic carbon (δ13CDIC), the end product of particulate organic carbon (POC) degradation, we quantified the δ13C value of the remineralized organic carbon (δ13COCx), which was −18.5 ± 1.0‰. This isotopic composition was very similar to the δ13C of marine sourced POC produced in situ (−18.5 ± 0.3‰) rather than that of the terrestrially sourced POC (−24.4 ± 0.2‰). We concluded that marine-sourced organic matter, formed by eutrophication-induced marine primary production, was the dominant oxygen consumer in the subsurface hypoxic zone in the East China Sea off the Changjiang Estuary.</description><identifier>ISSN: 0013-936X</identifier><identifier>EISSN: 1520-5851</identifier><identifier>DOI: 10.1021/acs.est.5b06211</identifier><identifier>PMID: 26824328</identifier><identifier>CODEN: ESTHAG</identifier><language>eng</language><publisher>United States: American Chemical Society</publisher><subject>Brackish ; Carbon ; Carbon - analysis ; Carbon Isotopes - analysis ; China ; Estuaries ; Eutrophication ; Hypoxia ; Isotopes ; Oxygen ; Oxygen - analysis</subject><ispartof>Environmental science & technology, 2016-03, Vol.50 (5), p.2255-2263</ispartof><rights>Copyright © 2016 American Chemical Society</rights><rights>Copyright American Chemical Society Mar 1, 2016</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a460t-12dc502e0dc34d5a931857f0c304e83084ba2316adb6275e23f142aaf721a8e83</citedby><cites>FETCH-LOGICAL-a460t-12dc502e0dc34d5a931857f0c304e83084ba2316adb6275e23f142aaf721a8e83</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/acs.est.5b06211$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/acs.est.5b06211$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,780,784,2765,27076,27924,27925,56738,56788</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/26824328$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Wang, Hongjie</creatorcontrib><creatorcontrib>Dai, Minhan</creatorcontrib><creatorcontrib>Liu, Jinwen</creatorcontrib><creatorcontrib>Kao, Shuh-Ji</creatorcontrib><creatorcontrib>Zhang, Chao</creatorcontrib><creatorcontrib>Cai, Wei-Jun</creatorcontrib><creatorcontrib>Wang, Guizhi</creatorcontrib><creatorcontrib>Qian, Wei</creatorcontrib><creatorcontrib>Zhao, Meixun</creatorcontrib><creatorcontrib>Sun, Zhenyu</creatorcontrib><title>Eutrophication-Driven Hypoxia in the East China Sea off the Changjiang Estuary</title><title>Environmental science & technology</title><addtitle>Environ. Sci. Technol</addtitle><description>Coastal hypoxia is an increasingly recognized environmental issue of global concern to both the scientific community and the general public. We assessed the relative contributions from marine and terrestrially sourced organic matter that were responsible for oxygen consumption in a well-studied seasonal coastal hypoxic zone, the East China Sea off the Changjiang Estuary. Our fieldwork was conducted in August 2011 during reinstatement of a subsurface hypoxia, when we observed a continuous decline of dissolved oxygen along with production of dissolved inorganic carbon resulting from organic carbon remineralization. On the basis of a three end-member mixing model and determinations of the stable isotopic compositions of dissolved inorganic carbon (δ13CDIC), the end product of particulate organic carbon (POC) degradation, we quantified the δ13C value of the remineralized organic carbon (δ13COCx), which was −18.5 ± 1.0‰. This isotopic composition was very similar to the δ13C of marine sourced POC produced in situ (−18.5 ± 0.3‰) rather than that of the terrestrially sourced POC (−24.4 ± 0.2‰). We concluded that marine-sourced organic matter, formed by eutrophication-induced marine primary production, was the dominant oxygen consumer in the subsurface hypoxic zone in the East China Sea off the Changjiang Estuary.</description><subject>Brackish</subject><subject>Carbon</subject><subject>Carbon - analysis</subject><subject>Carbon Isotopes - analysis</subject><subject>China</subject><subject>Estuaries</subject><subject>Eutrophication</subject><subject>Hypoxia</subject><subject>Isotopes</subject><subject>Oxygen</subject><subject>Oxygen - analysis</subject><issn>0013-936X</issn><issn>1520-5851</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkc1Lw0AQxRdRbP04e5OAF0HSzuxmN5uj1GoF0YMK3sI02dgtbVKzieh_78ZWBUHwsgPL7735eIwdIQwQOA4pcwPjmoGcguKIW6yPkkMotcRt1gdAESZCPfXYnnNzAOAC9C7rcaV5JLjus9tx29TVamYzamxVhhe1fTVlMHlfVW-WAlsGzcwEY3JNMJrZkoJ7Q0FVFJ_foxmVz3Prn2Dsmpbq9wO2U9DCmcNN3WePl-OH0SS8ubu6Hp3fhBQpaELkeSaBG8gzEeWSEoFaxgVkAiKj_YzRlLhARflU8VgaLgqMOFERcyTtiX12uvZd1dVL6y-QLq3LzGJBpalal2IcK6UgkfE_UJUkGrUGj578QudVW5d-kc7Q3wul6KjhmsrqyrnaFOmqtku_fIqQdqmkPpW0U29S8YrjjW87XZr8m_-KwQNna6BT_vT8w-4DUteVTw</recordid><startdate>20160301</startdate><enddate>20160301</enddate><creator>Wang, Hongjie</creator><creator>Dai, Minhan</creator><creator>Liu, Jinwen</creator><creator>Kao, Shuh-Ji</creator><creator>Zhang, Chao</creator><creator>Cai, Wei-Jun</creator><creator>Wang, Guizhi</creator><creator>Qian, Wei</creator><creator>Zhao, Meixun</creator><creator>Sun, Zhenyu</creator><general>American Chemical Society</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QO</scope><scope>7ST</scope><scope>7T7</scope><scope>7U7</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>SOI</scope><scope>7X8</scope><scope>7QH</scope><scope>7UA</scope><scope>F1W</scope><scope>H97</scope><scope>L.G</scope></search><sort><creationdate>20160301</creationdate><title>Eutrophication-Driven Hypoxia in the East China Sea off the Changjiang Estuary</title><author>Wang, Hongjie ; 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Sci. Technol</addtitle><date>2016-03-01</date><risdate>2016</risdate><volume>50</volume><issue>5</issue><spage>2255</spage><epage>2263</epage><pages>2255-2263</pages><issn>0013-936X</issn><eissn>1520-5851</eissn><coden>ESTHAG</coden><abstract>Coastal hypoxia is an increasingly recognized environmental issue of global concern to both the scientific community and the general public. We assessed the relative contributions from marine and terrestrially sourced organic matter that were responsible for oxygen consumption in a well-studied seasonal coastal hypoxic zone, the East China Sea off the Changjiang Estuary. Our fieldwork was conducted in August 2011 during reinstatement of a subsurface hypoxia, when we observed a continuous decline of dissolved oxygen along with production of dissolved inorganic carbon resulting from organic carbon remineralization. On the basis of a three end-member mixing model and determinations of the stable isotopic compositions of dissolved inorganic carbon (δ13CDIC), the end product of particulate organic carbon (POC) degradation, we quantified the δ13C value of the remineralized organic carbon (δ13COCx), which was −18.5 ± 1.0‰. This isotopic composition was very similar to the δ13C of marine sourced POC produced in situ (−18.5 ± 0.3‰) rather than that of the terrestrially sourced POC (−24.4 ± 0.2‰). We concluded that marine-sourced organic matter, formed by eutrophication-induced marine primary production, was the dominant oxygen consumer in the subsurface hypoxic zone in the East China Sea off the Changjiang Estuary.</abstract><cop>United States</cop><pub>American Chemical Society</pub><pmid>26824328</pmid><doi>10.1021/acs.est.5b06211</doi><tpages>9</tpages></addata></record> |
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| subjects | Brackish Carbon Carbon - analysis Carbon Isotopes - analysis China Estuaries Eutrophication Hypoxia Isotopes Oxygen Oxygen - analysis |
| title | Eutrophication-Driven Hypoxia in the East China Sea off the Changjiang Estuary |
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