title: Sedimentary organic and inorganic records of eutrophication and hypoxia in and off the Changjiang Estuary over the last century.
abstract: Organic and inorganic sedimentary parameters in and off the Changjiang Estuary have been analyzed to reconstruct historical trends in eutrophication and hypoxia over the last century. The lipid biomarker concentrations in the Changjiang Estuary mud area (CEMA) indicated eutrophication accelerated after the 1970s. Meanwhile, Mo/Al indicated hypoxia has increased since 1960s. Eutrophication and hypoxia in the CEMA are primarily a result of the dramatically increased load of terrestrial nutrients from the Changjiang to the East China Sea. The lipid biomarker concentrations in the southwest Cheju Island mud area (SCIMA) showed primary production is controlled mainly by changes in regional climate and marine current. No significant hypoxia occurred in the SCIMA over the past century as indicated by Mo/Al. Therefore, geochemical indicators of eutrophication and hypoxia revealed different patterns between the CEMA and SCIMA, suggesting the role of river-derived nutrients in sustaining eutrophication and hypoxia in the CEMA since the 1960s.
authors.affiliation: Second Institute of Oceanography, State Oceanic Administration (SOA), Hangzhou 310012, China; Key Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Hangzhou 310012, China. Electronic address: jzhao@sio.org.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Second Institute of Oceanography, State Oceanic Administration (SOA), Hangzhou 310012, China. Electronic address: fengxuwen2006@126.com.
authors.forename: Xuwen
authors.initials: X
authors.lastname: Feng
authors.affiliation: Second Institute of Oceanography, State Oceanic Administration (SOA), Hangzhou 310012, China; Key Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Hangzhou 310012, China.
authors.forename: Xiaolai
authors.initials: X
authors.lastname: Shi
authors.affiliation: Second Institute of Oceanography, State Oceanic Administration (SOA), Hangzhou 310012, China; Key Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Hangzhou 310012, China.
authors.forename: Youcheng
authors.initials: Y
authors.lastname: Bai
authors.affiliation: Second Institute of Oceanography, State Oceanic Administration (SOA), Hangzhou 310012, China; Key Laboratory of Submarine Geosciences, SOA, Hangzhou 310012, China.
authors.forename: Xiaoguo
authors.initials: X
authors.lastname: Yu
authors.affiliation: Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, SOA, Qingdao 266061, China.
authors.forename: Xuefa
authors.initials: X
authors.lastname: Shi
authors.affiliation: Second Institute of Oceanography, State Oceanic Administration (SOA), Hangzhou 310012, China; Key Laboratory of Submarine Geosciences, SOA, Hangzhou 310012, China.
authors.forename: Weiyan
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors.forename: Rongping
authors.initials: R
authors.lastname: Zhang
mesh_terms: D015415:Biomarkers / Q000032:analysis; D002244:Carbon / Q000032:analysis; D002681:China; D004784:Environmental Monitoring; D063366:Estuaries; D005068:Eutrophication; D019015:Geologic Sediments / Q000032:analysis / Q000737:chemistry; D008055:Lipids / Q000032:analysis; D008982:Molybdenum / Q000032:analysis; D010100:Oxygen / Q000032:analysis; D045483:Rivers
chemical_list: D015415:Biomarkers; D008055:Lipids; D002244:Carbon; D008982:Molybdenum; D010100:Oxygen
keywords: Biomarker; Changjiang Estuary; Eutrophication; Hypoxia; Redox sensitive element; Sediments