A coupled physical-biogeochemical model is used with numerical experiments to investigate the dynamics controlling the spatiotemporal variability of dissolved oxygen (DO) distribution in the Bohai Sea. The model reproduces distinct seasonal variability of DO concentration in the Bohai Sea as characterized by low in summer with large vertical gradient and high in winter with enhanced ventilation. The evolution of bottom DO-depleted zones at northern and southern depressions is primarily controlled by water stratification and topography but also modulated by lateral transport. High bottom turbulence kinetic energy and weak stratification above the Central Bank of the Bohai Sea induce relatively high DO concentration. A comparison between the model and no-resuspension experiment suggests a slight (<5 %) impact of resuspension on DO concentration variation in the Bohai Sea. The input of terrestrial materials from the Yellow River may provide additional nutrients and phytoplankton, sustaining a relatively weak but stable oxygen production along the transport pathway.

中文翻译：

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控制渤海溶氧季节变化的动力学研究——数值研究


采用耦合的物理-生物地球化学模型和数值实验，研究了控制渤海溶解氧 （DO） 分布时空变化的动力学。该模型再现了渤海地区 DO 浓度明显的季节性变化，夏季低，垂直梯度大，冬季高，通风增强。北部和南部洼地底部 DO 耗尽带的演变主要受水分层和地形控制，但也受横向运输的调节。渤海中央岸上方的高底部湍流动能和弱分层诱导了相对较高的 DO 浓度。模型与不重悬试验的比较表明，重悬对渤海 DO 浓度变化的影响很小 （<5 %）。来自黄河的陆地物质输入可能提供额外的营养物质和浮游植物，从而维持沿运输路径相对微弱但稳定的氧气生产。