文献类型：期刊文献

英文题名：Tidal variation modulates the dissolved silicate behavior and exchange flux across the semi-enclosed bay-coastal water continuum, China

作者：Zhang, Peng[1];Xie, Jiale[1];Zhang, Jibiao[1];Fu, Miaojian[1];Luo, Weisheng[1];Cheng, Mingyue[1]

机构：[1]Guangdong Ocean Univ, Coll Chem & Environm Sci, Zhanjiang, Guangdong, Peoples R China

年份：2023

卷号：10

外文期刊名：FRONTIERS IN MARINE SCIENCE

收录：SCI-EXPANDED(收录号：WOS:001070755700001)、、Scopus(收录号：2-s2.0-85171260041)、WOS

基金：The authors are grateful for the reviewers' careful review and constructive suggestions to improve the manuscript.r This research was financially supported by Research and Development Projects in Key Areas of Guangdong Province (2020B1111020004); Guangdong Basic and Applied Basic Research Foundation (2023A1515012769); Guangdong Basic and Applied Basic Research Foundation (2020A1515110483); Guangxi Key Laboratory of Marine Environmental Change and Disaster in Beibu Gulf, Beibu Gulf University (2022KF005); Guangdong Ocean University Fund Project (R18021); First-class Special Fund (231419018); Innovation Strong School Project (230420021) of Guangdong Ocean University.

语种：英文

外文关键词：tidal variation; dissolved silicate; behavior; semi-enclosed bay; coastal water continuum

外文摘要：Coastal water is the key transition zone for the circulation and transport of nutrients. Their role in transporting nutrients is important to understanding global dissolved silicate (DSi) cycles and sources of nutrients supporting the biological pump and ocean carbon cycle. However, the understanding of controlling DSi exchange flux between the semi-enclosed bay and coastal water was still scarcely due to limitations in continuous observation. In this study, we conducted continuous investigations during spring tide (ST) and neap tide (NT) in 2021 in Shuidong Bay (SDB), China, to explore the impacts of different tidal cycles on DSi in SDB and the fluxes across SDB and South China Sea (SCS) coastal water. The findings demonstrated that there were significant differences in DSi concentrations and nutrients ratios between ST and NT in S1 station (P < 0.05). In addition, the DSi concentrations were 32.01 +/- 27.21 mmol/L and 51.48 +/- 48.44 mmol/L in ST and NT, respectively. Besides, the net export of DSi from SDB to SCS was 0.18 t throughout the entire early of autumn tidal cycle, suggesting SDB was the source of DSi, and its behavior across the semi-enclosed bay-coastal water continuum was largely controlled by tidal characteristics (tidal height, flow velocity), water physicochemical parameters (salinity, pH), biological uptake and terrestrial sources input. SDB in ST has higher proportions of DSi: DIN (dissolved inorganic nitrogen) (1.49 +/- 1.28) and DSi: DIP (dissolved inorganic phosphorus) (58.6 +/- 43.73) compared with NT, DSi: DIN and DSi: DIP for the NT period were 1.45 +/- 1.15 and 43.99 +/- 28.59, indicating that phosphorus (P) is the limiting trophic factor for SDB. The tidal cycle in SDB would alter the DSi stoichiometry and mitigated the impact of eutrophication caused by terrestrial sources. This study provides new insights in the Si tidal cycling across the semi-enclosed bay-coastal water continuum, which was implications for understanding DSi biogeochemical process and primary production dynamics in coastal water.