Grain size composition and transport of sedimentary organic carbon in the Changjiang River (Yangtze River) Estuary and Hangzhou Bay and their adjacent waters

ZHANG Weiyan; JIN Haiyan; YAO Xuying; JI Zhongqiang; ZHANG Xiaoyu; YU Xiaoguo; ZHANG Fuyuan; GAO Aigen

doi:10.1007/s13131-015-0711-y

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Article Navigation > Acta Oceanologica Sinica > 2015 > 34(10): 46-56

ZHANG Weiyan, JIN Haiyan, YAO Xuying, JI Zhongqiang, ZHANG Xiaoyu, YU Xiaoguo, ZHANG Fuyuan, GAO Aigen. Grain size composition and transport of sedimentary organic carbon in the Changjiang River (Yangtze River) Estuary and Hangzhou Bay and their adjacent waters[J]. Acta Oceanologica Sinica, 2015, 34(10): 46-56. doi: 10.1007/s13131-015-0711-y

Citation:

ZHANG Weiyan, JIN Haiyan, YAO Xuying, JI Zhongqiang, ZHANG Xiaoyu, YU Xiaoguo, ZHANG Fuyuan, GAO Aigen. Grain size composition and transport of sedimentary organic carbon in the Changjiang River (Yangtze River) Estuary and Hangzhou Bay and their adjacent waters[J]. Acta Oceanologica Sinica, 2015, 34(10): 46-56. doi: 10.1007/s13131-015-0711-y

Citation:

ZHANG Weiyan, JIN Haiyan, YAO Xuying, JI Zhongqiang, ZHANG Xiaoyu, YU Xiaoguo, ZHANG Fuyuan, GAO Aigen. Grain size composition and transport of sedimentary organic carbon in the Changjiang River (Yangtze River) Estuary and Hangzhou Bay and their adjacent waters[J]. Acta Oceanologica Sinica, 2015, 34(10): 46-56. doi: 10.1007/s13131-015-0711-y

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Grain size composition and transport of sedimentary organic carbon in the Changjiang River (Yangtze River) Estuary and Hangzhou Bay and their adjacent waters

doi: 10.1007/s13131-015-0711-y

1.
Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
3.
Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China

Received Date: 2014-07-11
Rev Recd Date: 2014-10-21

Abstract

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.
- Changjiang River (Yangtze River) Estuary,
- Hangzhou Bay,
- grain size composition,
- organic carbon,
- material transport

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References(44)

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