河流冲淡水与上升流耦合对珠江口生物地球化学过程的影响

Key Points

• The study aims to investigate how coupled river freshwater discharge and upwelling affect biogeochemical processes in the Pearl River Estuary.
• Conducted high-resolution observations in June 2021 at Pearl River Estuary.
• Utilized a validated ternary mixing model to quantify nutrient consumption and accumulation.
• Assessed spatial distribution characteristics of hypoxic waters across contrasting hydrodynamic scenarios.
• Under high river flow, hypoxic area expanded to approximately 1232 km², with increased nutrient accumulation.
• Under low river flow conducive to upwelling, hypoxic area reduced to about 412 km², and less nutrient accumulation occurred.
• Fitting slopes of DIN and DIP accumulation were 16.4 and 15.1, respectively, consistent with Redfield ratio.