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ZHANG Weiyan,JIN Haiyan,YAO Xuying,JI Zhongqiang,ZHANG Xiaoyu,YU Xiaoguo,ZHANG Fuyuan,GAO Aigen. 2015. Grain size composition and transport of sedimentary organic carbon in the Changjiang River (Yangtze River) Estuary and Hangzhou Bay and their adjacent waters. Acta Oceanologica Sinica, 34(10):46-56
Grain size composition and transport of sedimentary organic carbon in the Changjiang River (Yangtze River) Estuary and Hangzhou Bay and their adjacent waters
Grain size composition and transport of sedimentary organic carbon in the Changjiang River (Yangtze River) Estuary and Hangzhou Bay and their adjacent waters
Received:July 11, 2014  Revised:October 21, 2014
DOI:10.1007/s13131-015-0711-y
Key words:Changjiang River (Yangtze River) Estuary  Hangzhou Bay  grain size composition  organic carbon  material transport
中文关键词:  Changjiang River (Yangtze River) Estuary  Hangzhou Bay  grain size composition  organic carbon  material transport
基金项目:The National Basic Research Program (973 Program) of China under contract No. 2010CB428903; the National Natural Science Foundation of China under contract Nos 41106050, 41203085 and 41076036; the Public Welfare Industry Research Specific Funding of China under contract Nos 201105014, 201105012 and 201205008; the Basic Scientific Research Fund of the Second Institute of Oceanography of State Oceanic Administration of China under contract Nos JG1108 and JG1219.
Author NameAffiliationE-mail
ZHANG Weiyan Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China 
zwy885@163.com 
JIN Haiyan Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China 
 
YAO Xuying Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China 
 
JI Zhongqiang Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China 
 
ZHANG Xiaoyu Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China  
YU Xiaoguo Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China 
 
ZHANG Fuyuan Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China 
 
GAO Aigen Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China 
 
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Abstract:
      Surface sediments from the Changjiang River (Yangtze River) Estuary, Hangzhou Bay, and their adjacent waters were analyzed for their grain size distribution, organic carbon (OC) concentration, and stable carbon isotope composition (δ13C). Based on this analysis, about 36 surface sediment samples were selected from various environments and separated into sand (>0.250 mm, 0.125-0.250 mm, 0.063-0.125 mm) and silt (0.025-0.063 mm) fractions by wet-sieving fractionation methods, and further into silt- (0.004-0.025 mm) and clay-sized (<0.004 mm) fractions by centrifugal fractionation. Sediments of six grain size categories were analyzed for their OC and δ13C contents to explore the grain size composition and transport paths of sedimentary OC in the study area. From fine to coarse fractions, the OC content was 1.18%, 0.51%, 0.46%, 0.42%, 0.99%, and 0.48%, respectively, while the δ13C was -21.64‰, -22.03‰, -22.52‰, -22.46‰, -22.36‰, and -22.28‰, respectively. In each size category, the OC contribution was 42.96%, 26.06%, 9.82%, 5.75%, 7.09%, and 8.33%, respectively. The OC content in clay and fine silt fractions (<0.025 mm) was about 69.02%. High OC concentrations were mainly found in offshore modern sediments in the northeast of the Changjiang River Estuary, in modern sediments in the lower estuary of the Changjiang River and Hangzhou Bay, and in Cyclonic Eddy modern sediments to the southwest of the Cheju Island. Integrating the distribution of terrestrial OC content of each grain size category with the δ13C of the bulk sediment indicated that the terrestrial organic material in the Changjiang River Estuary was transported seaward and dispersed to the Cyclonic Eddy modern sediments to the southwest of the Cheju Island via two pathways: one was a result of the Changjiang River Diluted Water (CDW) northeastward extending branch driven by the North Jiangsu Coastal Current and the Yellow Sea Coastal Current, while the other one was the result of the CDW southward extending branch driven by the Taiwan Warm Current.
中文摘要:
      Surface sediments from the Changjiang River (Yangtze River) Estuary, Hangzhou Bay, and their adjacent waters were analyzed for their grain size distribution, organic carbon (OC) concentration, and stable carbon isotope composition (δ13C). Based on this analysis, about 36 surface sediment samples were selected from various environments and separated into sand (>0.250 mm, 0.125-0.250 mm, 0.063-0.125 mm) and silt (0.025-0.063 mm) fractions by wet-sieving fractionation methods, and further into silt- (0.004-0.025 mm) and clay-sized (<0.004 mm) fractions by centrifugal fractionation. Sediments of six grain size categories were analyzed for their OC and δ13C contents to explore the grain size composition and transport paths of sedimentary OC in the study area. From fine to coarse fractions, the OC content was 1.18%, 0.51%, 0.46%, 0.42%, 0.99%, and 0.48%, respectively, while the δ13C was -21.64‰, -22.03‰, -22.52‰, -22.46‰, -22.36‰, and -22.28‰, respectively. In each size category, the OC contribution was 42.96%, 26.06%, 9.82%, 5.75%, 7.09%, and 8.33%, respectively. The OC content in clay and fine silt fractions (<0.025 mm) was about 69.02%. High OC concentrations were mainly found in offshore modern sediments in the northeast of the Changjiang River Estuary, in modern sediments in the lower estuary of the Changjiang River and Hangzhou Bay, and in Cyclonic Eddy modern sediments to the southwest of the Cheju Island. Integrating the distribution of terrestrial OC content of each grain size category with the δ13C of the bulk sediment indicated that the terrestrial organic material in the Changjiang River Estuary was transported seaward and dispersed to the Cyclonic Eddy modern sediments to the southwest of the Cheju Island via two pathways: one was a result of the Changjiang River Diluted Water (CDW) northeastward extending branch driven by the North Jiangsu Coastal Current and the Yellow Sea Coastal Current, while the other one was the result of the CDW southward extending branch driven by the Taiwan Warm Current.
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