The impact of summer Yangtze river runoff fluctuations on estuarine fronts dynamics and zooplankton communities from 2016 to 2023

Frontiers in Marine Science, Год журнала: 2025, Номер 12

Опубликована: Март 20, 2025

Estuarine fronts, which arise from the convergence of distinct water masses, exhibit considerable spatial and temporal variability play a crucial role in shaping ecological dynamics within estuarine ecosystems. Despite their importance, due to limited data, there’s inefficiency understanding on how biological communities, particularly zooplankton, respond these dynamic environmental features. The Yangtze River Estuary (YRE), transitional zone between East China Sea, is an ideal place study response zooplankton communities as freshwater discharge, offshore waters, Taiwan Warm Current converge here form sediment plume fronts summer. We investigate variables including temperature, salinity, turbidity, Chlorophyll (Chl ) YRE during summer 2016 2023, examine differences distribution community dominant factors controlling variation different runoff years. Our findings found that appeared around 122.5°E except drought years (2022 2023); extended 123.5°E beyond wet (2016, 2020 2021), while shrank 123°E were classified into low-salinity, moderate-salinity, high-salinity groups spatially most years, but low-salinity group had not been detected extreme year 2022. During flood nearshore species such Oithona brevicornis , Centropages dorsispinatus Cladocera exhibited notable increase dominance, favored euryhaline like Microsetella rosea . Furthermore, salinity temperature all played significant roles only important factor These results implied prominent shaped collectively; contrast, disappeared variation. Besides, extremely low 2022 has shown lead obvious changes might affect fisheries stocks require concern.

Язык: Английский

Impact of a New Wave Mixing Scheme on Ocean Dynamics in Typhoon Conditions: A Case Study of Typhoon In-Fa (2021)

Remote Sensing, Год журнала: 2024, Номер 16(17), С. 3298 - 3298

Опубликована: Сен. 5, 2024

Wave-induced mixing can enhance vertical in the upper ocean, facilitating exchange of heat and momentum between surface deeper layers, thereby influencing ocean circulation climate patterns. Building on previous research, this study proposes a wave-induced parameterization scheme (referred to as EXP3) specifically designed for typhoon periods. This was integrated into fully coupled ocean–wave–atmosphere model COAWST applied analyze Typhoon In-Fa (2021) case study. The simulation results were validated against publicly available data, demonstrating good overall match with observed phenomena. Subsequently, comparative analysis conducted EXP3 scheme, (EXP2) original (EXP1). Validation Argo Drifter buoy data revealed that both EXP2 EXP3, which include effects, resulted decrease simulated mixed layer depth (MLD) temperature (MLT), showing closer alignment data. Compared other two experiments, enhanced motion due intensified mixing, leading increased upper-layer water divergence upwelling, sea accelerated rightward deflection currents. phenomenon not only altered structure but also significantly impacted regional dynamics.

Язык: Английский

Quantitative Assessment of Oysters’ Multiple Nitrogen Removal Pathways in a Subtropical Bay

Journal of Marine Science and Engineering, Год журнала: 2024, Номер 13(1), С. 21 - 21

Опубликована: Дек. 27, 2024

Oyster aquaculture helps mitigate coastal eutrophication by assimilating organic nitrogen for biomass and denitrification in both the oyster digestive tract sediment below. Efforts are needed quantitative assessment of oysters’ multiple removal pathways at large-scale sites, especially bodies, which has been much less quantified among these pathways. This study takes a subtropical estuary (Shenzhen Bay South China) as testbed to conduct laboratory rearing experiments field investigation. The results show that an individual harvest size can remove 0.59 mg-N day−1 through within body, be proportionally extrapolated 4.6 kg-N km−2 Shenzhen Bay. Assimilating measurements into “flux inventory model” yields oyster-induced total 33.3 day−1, harvest, oysters, contributed 26%, 14%, 60%, respectively. Additionally, oyster’s filter-feeding lifestyle exports from water column sediment, contribute ~3% daily input bay. confirms potential removal, provides working framework growing scale floating aquaculture.

Язык: Английский