A comprehensive sediment dynamics study of a major mud belt system on the inner shelf along an energetic coast

Liu, James T.; Hsu, Ray T.; Yang, Rick J.; Wang, Ya Ping; Wu, Hui; Du, Xiaoqin; Li, Anchun; Chien, Steven C.; Lee, Jay; Yang, Shouye; Zhu, Jianrong; Su, Chih-Chieh; Chang, Yi; Huh, Chih An

doi:10.1038/s41598-018-22696-w

Cited by 47 publications

(32 citation statements)

References 59 publications

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“…during February and March 2014 that they deduced the YS water could be transported to the ECS (Liu et al, 2018). Our result suggests that the YSCC water might also be transported to the inner shelf (29 °N, 122 °E) of ECS during October via the intermediate or near-bottom layer water.…”

Section: I Budget In the Ecsmentioning

confidence: 54%

Spatial and vertical distribution of 129I and 127I in the East China Sea: Inventory, source and transportation

Wang

Fan

Liu

et al. 2019

Science of The Total Environment

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Iodine-129 is useful to trace water mass movement in the ocean. In this study, the concentration of iodine isotopes in seawater of the East China Sea (ECS) in October 2013 were analyzed to investigate the spatial and vertical distribution of 129 I and 127 I so as to indicate the water mass exchange in the ECS. The results showed that the 129 I/ 127 I atomic ratios varied with the water mass flowing, with higher values of (10-20)×10-11 in the coastal regions and lower values of <8×10-11 in the offshore. The inventories of 129 I were estimated to be (0.23-1.7) ×10 12 atoms m-2 (n=18) in upper 100 m waters, which is comparable to those of other regions without being contaminated by the nuclear accidents or nuclear reprocessing facilities. The total amount of 129 I in the ECS water column was estimated to be 88 g in which over 90% is attributed to the oceanic input (e.g., West Pacific) via the Kuroshio Current (KC), etc. The contributions of 129 I from the Changjiang input (<7.5%) and atmospheric fallout (<2.7%) were small. Those from the Fukushima accident was negligible during this investigation. The 129 I/ 127 I ratios vs. salinity distribution showed the distribution range and stratification of the Changjiang, Yellow Sea and KC waters in the ECS. Our study shows that the Changjiang fresh water could be transported to the North Jiangsu coast in October; the Taiwan Warm Current water could intrude to Northern part of the Changjiang Estuary (32 °N). Besides, our results suggest that the 129 I/ 127 I profile is useful to indicate the seawater mixing process in ocean marginal systems.

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Section: I Budget In the Ecsmentioning

confidence: 54%

Spatial and vertical distribution of 129I and 127I in the East China Sea: Inventory, source and transportation

Wang

Fan

Liu

et al. 2019

Science of The Total Environment

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“…Because of the huge amount of terrestrial materials transported by the plume, the ZMCW suffers from frequent harmful algae blooms and seasonal hypoxia (Figure b; Cai et al, ; Chai et al, ; D. Li et al, ; Rabouille et al, ; Zhou et al, ; J. Zhu et al, ). There is a long mud belt lying on the ZMCW, which was formed as a result of sediment deposition from the Changjiang River (Figure b; Liu et al, , ; Milliman et al, ; Xu et al, ; C. Zhu et al, ).…”

Section: Methodsmentioning

confidence: 99%

“…Zhu et al, 2016). There is a long mud belt lying on the ZMCW, which was formed as a result of sediment deposition from the Changjiang River ( Figure 1b; Liu et al, 2018Liu et al, , 2006Milliman et al, 1985;Xu et al, 2009;C. Zhu et al, 2011).…”

Section: Study Areamentioning

confidence: 99%

Tidal Mixing Sustains a Bottom‐Trapped River Plume and Buoyant Coastal Current on an Energetic Continental Shelf

Tao

2018

JGR Oceans

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Conventional wisdoms on river plume dynamics suggest that a down‐shelf buoyant coastal current will ultimately be trapped at a specific depth, that is, the trapping depth, as constrained by riverine outflow and offshore bottom Ekman transport. Theoretically, a prerequisite down‐shelf current is necessary to form a stable bottom‐trapped river plume. In this study an alternative is described by carrying out a modeling study on the Zhe‐Min Coastal Current (ZMCC). Buoyant water from the Changjiang River is a major factor driving the ZMCC, as is common in bottom‐trapped river plumes; however, the trapping depth is more determined by tidal mixing. When the plume water comes to the sloping topography, strong tidal mixing induces a mixing front, shoreward of which the bottom Ekman layer occupies the entire water column. Such a tidal‐induced front maintains a down‐shelf frontal current, which is intensified both at the surface due to the thermal wind balance and on the top of bottom boundary layer due to the tidal rectification. Direct wind‐induced transport only covers a small fraction of the ZMCC; however, it redistributes the plume water and, thus, affects the coastal current. The tide‐induced frontal trapping depth varies much less between seasons than that predicted by previous plume theories. Instead, it fluctuates strongly in the spring‐neap cycle. Even in summer when upwelling‐favorable winds prevail, the mixing front still sustains a down‐shelf coastal current. Intense tidal mixing exists in many coastal waters, which might be an alternative mechanism in forming bottom‐trapped river plumes and their associated buoyant coastal current.

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“…Both the Changjiang Delta and the Oujiang Delta are located adjacent to an actively subsiding continental shelf, impacted by a huge sediment load, brought by the Changjiang River. Both sites are affected because the river sediments are carried south along the coast once they reach the ocean, as part of a belt that extends for more than 1000 km (Liu et al 2018). The outer Changjiang Delta has been subsiding at a rate of 1-2 mm a -1 since MIS 5 (Fang 1959;Huang 1959;Yu 1959;Li et al 2000;Wang et al 2013), and continental shelf sediments opposite the Oujiang Delta are Figure 8 Age-depth relationships of the MIS 3 (YQ0901 and YQ0902) paleosols and the Early Holocene (YQ0903 and YQ0904) paleosols, compared to relative sea level for the past 40 ka.…”

Section: Discussionmentioning

confidence: 99%

Sea level implications from Late Quaternary/Holocene paleosols from the Oujiang Delta, China

2018

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We describe two coastal paleosols recovered in sediment cores from the Oujiang Delta, Southeast China. These provide useful benchmarks for past sea level change on the East China Sea coast. Radiocarbon (14C) dates on charcoal and plant matter show that one formed during Marine Isotope Stage 3 (MIS 3) and was exposed for perhaps 20 ka, during the Last Glacial Maximum. The other formed in the Early Holocene and was briefly exposed, during a period of fluctuating sea level. Similar paleosols have been described from the Changjiang (Yangtze) Delta, and at many other sites from the East China Sea. The MIS 3 paleosol records a regional relative sea level of about –27 m at the end of MIS 3. While this value is consistent with other paleo sea level estimates for the East China Sea region, it is much higher than predicted by eustatic sea level estimates.

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A comprehensive sediment dynamics study of a major mud belt system on the inner shelf along an energetic coast

Cited by 47 publications

References 59 publications

Spatial and vertical distribution of 129I and 127I in the East China Sea: Inventory, source and transportation

Spatial and vertical distribution of 129I and 127I in the East China Sea: Inventory, source and transportation

Tidal Mixing Sustains a Bottom‐Trapped River Plume and Buoyant Coastal Current on an Energetic Continental Shelf

Sea level implications from Late Quaternary/Holocene paleosols from the Oujiang Delta, China

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