Winter storms induced high suspended sediment concentration along the north offshore seabed of the Changjiang estuary

Tang, Jieping; Wang, Ya Ping; Zhu, Qiao; Jia, Jianjun; Xiong, Jilian; Cheng, Peng; Wu, Hui; Chen, Dezhi; Wu, Hao

doi:10.1016/j.ecss.2019.106351

Cited by 22 publications

(14 citation statements)

References 47 publications

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“…Figures S14 and S15 in Supporting Information show that in the study area, seawater at the surface in July generally received greater illumination intensities along with higher temperatures, lower SPM contents, and higher chlorophyll‐ a concentrations than those in March. The higher SPM concentrations in the winter, largely due to storms, have been widely reported in the study area (e.g., Tang et al., 2019). The higher seawater transparency (reflected by the lower SPM concentrations) and greater illumination intensities at the surface allow more sunlight to penetrate in the summer, which, together with the higher temperatures at the surface, support more phytoplankton biomass (reflected by the higher chlorophyll‐ a concentrations) and higher nutrient variation rates for NO 3 − , SiO 3 2− , and PO 4 3− (Figures 7–9).…”

Section: Discussionmentioning

confidence: 52%

New Insights Into the Non‐Conservative Behaviors of Nutrients Triggering Phytoplankton Blooms in the Changjiang (Yangtze) River Estuary

Wang

Gao

2022

JGR Oceans

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Four research cruises were carried out during March and July in 2015 and 2016 in the Changjiang (Yangtze) River Estuary and the adjacent shelf. Nutrient concentrations (regarded as static parameters) were measured in the surface and bottom waters collected at 86–99 stations over the course of these cruises. In addition, unfiltered seawater samples were incubated onboard for 48 hr to measure the potential change rates of nutrients (regarded as dynamic parameters). These parameters can help directly elucidate non‐conservative behaviors of nutrients in order to determine whether seawater serves as a source or a sink. Large nutrient sinks (with more negative variation rates) were consistently found at the surface during the two July cruises at the stations just along the outside edge of the turbidity maximum zone near the mouth of the river. Negative rates, although with much smaller magnitudes, were also found in most bottom water samples in July and at both the surface and bottom in March. The high net nutrient uptake rates at the surface in the summer triggered bloom events later at the seaward stations, showing that high net nutrient uptake is the cause and high chlorophyll‐a is the consequence of the bloom. Such information about biogeochemical cycling of nutrients and the mechanisms and development of bloom events occurring in large river estuarine and coastal areas could not have been obtained if these static and dynamic parameters had not been studied together.

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Section: Discussionmentioning

confidence: 52%

New Insights Into the Non‐Conservative Behaviors of Nutrients Triggering Phytoplankton Blooms in the Changjiang (Yangtze) River Estuary

Wang

Gao

2022

JGR Oceans

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“… b Based on Tang et al. (2019), Y. Zhang et al. (2020), and historical data (1996–2001) in March at the YSC Station (NMDIS, http://mds.nmdis.org.cn/).…”

Section: Methodsmentioning

confidence: 99%

Unraveling the Synoptic‐Scale Penetration of the Yellow Sea Coastal Water Into the Changjiang River Estuary

et al. 2022

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As one of the most important coastal currents in the Northeast Pacific marginal seas, the Yellow Sea Coastal Water (YSCW) plays an essential role in modulating regional ocean circulation and the transregional exchange of biogeochemical materials. However, the wintertime transport pattern of the YSCW and its interaction with the Changjiang River Estuary (CJE) are intensely debated. Herein, we used a combination method of Principal Component Analysis‐based cluster analysis and Optimum Multiparameter Analysis, together with remote sensing data, to investigate the classification, distributions, pathways and mixture ratios of various water masses off the CJE in winter. Results clearly suggest that in winter the YSCW can repeatedly penetrate to the CJE in response to northerly wind bursts, and flows southward around 10–30 m isobaths off the CJE, with its impact scope reaching as far as at least 29.5°N. Furthermore, we propose a refined circulation pattern that the YSCW flows southward along 20–30 m isobaths on the Changjiang Bank, and thereby feeds the synoptic‐scale YSCW penetration into the CJE. Crucially, this work also highlights that the combination methodologies in a mathematic framework is useful for unraveling an implicit synoptic‐scale water mass interaction in highly dynamic estuaries and shelf seas, and thus provides better insight to ecological and environmental variability.

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“…Flocculation settling indirectly contributed to the high SSCs at the near-bottom layer, and the "salinityand SSC-induced stratification" effect was the main contributor to the ETM formation in our study. Local resuspension and horizontal advection have been suggested as two main constituent parts of SSC variation at fixed observation sites (Li et al 2018;Tang et al 2019;Xiong et al 2017). In this study, we mainly focus on vertical physical processes; however, horizontal advection processes are also crucial to the development of the ETM.…”

Section: Feedback Among Salinity-induced Stratification Ssc and Flocculationmentioning

confidence: 99%

Constraints of salinity- and sediment-induced stratification on the turbidity maximum in a tidal estuary

Lü

Zhang

et al. 2020

Geo-Mar Lett

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The vertical density gradients of salinity and suspended sediment concentration (SSC) cause stratification in estuaries, which play a vital role in the turbulence structure, water mixing, and sediment transport. To investigate the effect of stratification, especially SSC-induced stratification, on maintaining the estuarine turbidity maximum (ETM), we conducted in situ measurements on sediment dynamics at the upper and central ETM sites in the South Passage of Changjiang Estuary in July 2018. The gradient Richardson number was estimated as a proxy for the stratification that is attributable to salinity or/and SSC. We found that salinity-induced stratification was observed mainly on the surface and in the middle layers, whereas SSC-induced stratification occurred mainly in the near-bottom layers. Furthermore, at the central ETM, the baroclinic effect was enhanced during the neap tide when the salinity-induced stratification was stronger than that during the spring tide. In the early phase of floods with minimum velocity during the neap tide, salinity-induced stratification suppressed the turbulence and vertical diffusion of sediments. Moreover, the flocculation enhanced the settling process within the water column. Consequently, high concentrations of fine-grained sediments formed near the bottom and promoted SSC-induced stratification, thereby leading to the continuous accumulation and trapping of sediments. In conclusion, the interactions among the "salinityand SSC-induced stratification" processes served as crucial constraints of the temporal and spatial variations of the ETM in the Changjiang Estuary.

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Winter storms induced high suspended sediment concentration along the north offshore seabed of the Changjiang estuary

Cited by 22 publications

References 47 publications

New Insights Into the Non‐Conservative Behaviors of Nutrients Triggering Phytoplankton Blooms in the Changjiang (Yangtze) River Estuary

New Insights Into the Non‐Conservative Behaviors of Nutrients Triggering Phytoplankton Blooms in the Changjiang (Yangtze) River Estuary

Unraveling the Synoptic‐Scale Penetration of the Yellow Sea Coastal Water Into the Changjiang River Estuary

Constraints of salinity- and sediment-induced stratification on the turbidity maximum in a tidal estuary

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