Tidal variation of total suspended solids over the Yangtze Bank based on the geostationary ocean color imager

Abstract

Hourly mapping by a Geostationary Ocean Color Imager was used to reveal the spatial pattern and tidal variation of total suspended solids (TSS) over the Yangtze Bank in the Yellow and East China Seas during the winter. The TSS form a tongueshaped structure, which decreases further offshore in a stepwise manner. The stepwise change is separated by two fronts of TSS, which are located near the 20-m and 50-m isobaths. The tidal variation of TSS concentration during the study period is evident and can be divided into three stages: decay, maintenance, and growth. Compared with the relatively stationary TSS during the maintenance stage, drastic changes exist during the decay and growth stages. In terms of tide-induced mixing, the dynamic analysis shows that both the topography and the tidal currents play an important role in the spatio-temporal variation of TSS during the tidal period. In particular, spatial distribution is primarily determined by the topography, whereas the temporal variations in tidal scale are determined by the tidal currents.

Spatio‐Temporal Variability of Suspended Sediment Fronts (SSFs) on the Inner Shelf of the East China Sea: The Contribution of Multiple Factors

“…Framinan and Brown (1996) found that the frontal density distribution of turbidity fronts was highly consistent with the distribution of tidal mixing intensity in the Río La Plata Estuary, underlining a strong tidal control mechanism. In addition, tide‐induced vertical mixing was determined to be the dominant mechanism of frontogenesis along the Yellow Sea coast (Hu et al., 2016) and over the Yangtze Bank (Y. Zhou, Xuan, et al., 2020). Romero‐Rodriguez et al.…”

“…For example, previous studies have demonstrated that GOCI‐derived SSC images could be applied to highly turbid coastal waters (Choi et al., 2014; H. Yang, Choi, et al., 2014). GOCI Level‐2 SSC data were used to validate the model simulation results in the ECS (Y. Wang, Wu, Lin, et al., 2019) and extract SSFs in the Yellow Sea (Hu et al., 2016), Gyeonggi Bay (H. Yang et al., 2016), the ECS (Yin & Huang, 2016), and over the Yangtze Bank (Y. Zhou, Xuan, et al., 2020). Rather than estimating SSCs, we specifically focus on SSF dynamics based on the hourly SSC data obtained for the 10‐year period from April 1, 2011, to March 31, 2021.…”

“…Yang et al, 2016), (c) Sobel gradient-based edge extraction algorithms (Y. Yang & Pang, 2012), (d) entropy-based edge detection algorithms (Hu et al, 2016), (e) the GRIDHIST method (Kirches et al, 2016), and (f) quantitative and qualitative methods based on reflectance gradients and SSC gradients (Framinan & Brown, 1996; Jaureguizar et al., 2003;Nagy et al, 2008;Yin & Huang, 2016;Y. Zhou, Xuan, et al, 2020).…”

“…Wang, Wu, Lin, et al, 2019) and extract SSFs in the Yellow Sea (Hu et al, 2016), Gyeonggi Bay (H. Yang et al, 2016), the ECS (Yin & Huang, 2016), and over the Yangtze Bank (Y. Zhou, Xuan, et al, 2020). Rather than estimating SSCs, we specifically focus on SSF dynamics based on the hourly SSC data obtained for the 10-year period from April 1, 2011, to March 31, 2021.…”

“…Tides play a significant role in frontogenesis, frontal distribution, and frontal persistence (Framinan & Brown, 1996;Framinan et al, 2008;Hu et al, 2016;Jago et al, 2006;Kirby & Parker, 1982;Romero-Rodriguez et al, 2020;Shi, 2010;Y. Wang, Wu, Lin, et al, 2019;Y. Zhou, Xuan, et al, 2020).…”