Coupling between physical processes and biogeochemistry of suspended particles over the inner shelf mud in the East China Sea
Liu, James T.1; Lee, Jay1; Yang, Rick J.1; Du, Xiaoqin2; Li, Anchun3; Lin, Yu-Shih1; Su, Chih-Chieh4; Tao, Shuqin5
Source PublicationMARINE GEOLOGY
Corresponding AuthorLiu, James T.(
AbstractThis study examines how geochemical signals regarding the source and transformation in suspended particles are transported in the marine portion of the sediment dispersal system. In the source-to-sink sedimentary continuum of a world major river, the Changjiang (Yangtze) River, is used to demonstrate the close coupling between the marine physical processes and the geochemical signals carried by suspended particles. A sediment trap mooring configured with a non-sequential sediment trap, a downward-looking ADCP, CTD, LISST-100x were deployed for 29 days in the winter of 2014 off the coast of Zhejiang Province, China in water depth of 22.5 m. The mooring rendered two types of data. Physical processes included temporal changes of water depth, currents at 11 depths, temperature at two depths, and salinity at one depth. There was 15-cm accumulation of captured particles in the trap, which rendered the total mass flux of 233.3 g/cm(2)/day. The trap material was analyzed for grain-size composition, total Pb-210, minerals including mica/illite, kaolinite, chlorite, k-feldspar, plagioclase, quartz, and dolomite. Organic material (TOC, TN) and carbon isotope delta C-13 were also measured. The range of terrestrial fraction (F-t) of the trap material was between 45-60%. EOF analysis was used to examine the covariability in both data sets. For the physical data set, 37 variables were used in the analysis. For the sediment trap material, 15 variables were used. The EOF results of the physical processes indicate the tidal flow was the most important physical forcing for the transport of suspended particles and water masses that carried marine- and terrestrial-sourced particles. Wave and current combined resuspension entrained reworked sediment off the seabed, which was then transported landward or seaward. The most important covariability of the particle properties in the sediment trap was caused by hydrodynamic sorting that separated the clay from silt and sand sizes. Geochemical signals of the particles were carried by clay and the particle mass (dry weight) was associated with silt and sand. The temporal characteristics of the sorting show the spring-neap tidal cycle. The next major distinction was the contrast between terrestrial- and marine-sourced materials. The EOF analysis further distinguish contributions from the distal Changjiang River and proximal small rivers at the tertiary level of the covariability. The coverabilities in both data sets show close correspondence. Our findings give firm evidence to show marine processes dominated the transport of land-derived fluvial sediment and the incorporation of marine-sourced particles into the dispersal system. There is complexity in both physical processes and geochemical signals of suspended particles. However, our study points out the close coupling between the two.
KeywordRiver plume Source-to-sink pathway Non-sequential sediment trap Spring-neap tide Resuspension Settling Hydrodynamic sorting Provenance
Indexed BySCI
Funding ProjectROC Ministry of Science and Technology[MOST 103-2611-M-110-012] ; ROC Ministry of Science and Technology[MOST 104-2611-M-110-011] ; ROC Ministry of Science and Technology[MOST 105-2119-M-110-006]
WOS Research AreaGeology ; Oceanography
WOS SubjectGeosciences, Multidisciplinary ; Oceanography
WOS IDWOS:000706525800012
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLiu, James T.
Affiliation1.Natl Sun Yat Sen Univ, Dept Oceanog, Kaohsiung, Taiwan
2.Zhejiang Ocean Univ, Marine Sci & Technol Coll, Zhoushan, Peoples R China
3.Chinese Acad Sci, Inst Oceanog, Qingdao, Peoples R China
4.Natl Taiwan Univ, Inst Oceanog, Taipei, Taiwan
5.Minist Nat Resources, Inst Oceanog 3, Xiamen, Peoples R China
Recommended Citation
GB/T 7714
Liu, James T.,Lee, Jay,Yang, Rick J.,et al. Coupling between physical processes and biogeochemistry of suspended particles over the inner shelf mud in the East China Sea[J]. MARINE GEOLOGY,2021,442:19.
APA Liu, James T..,Lee, Jay.,Yang, Rick J..,Du, Xiaoqin.,Li, Anchun.,...&Tao, Shuqin.(2021).Coupling between physical processes and biogeochemistry of suspended particles over the inner shelf mud in the East China Sea.MARINE GEOLOGY,442,19.
MLA Liu, James T.,et al."Coupling between physical processes and biogeochemistry of suspended particles over the inner shelf mud in the East China Sea".MARINE GEOLOGY 442(2021):19.
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