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Seasonal variations in the abundance and sinking flux of biogenic silica in Daya Bay, northern South China Sea

机译：南海北部大亚湾生物硅的丰度和下沉通量的季节性变化

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Summary Coastal seas account for 50% of the biogenic silica (BSi) production in marine environments. However, BSi sinking is poorly understood. Here, seasonal variations in the abundance and sinking flux of BSi were investigated in Daya Bay, in the northern South China Sea. The highest BSi concentrations occurred in summer, averaging 8.04?±?5.48?μmol?Lsup?1/sup (±SD), followed by autumn (5.51?±?3.11?μmol?Lsup?1/sup) and spring (3.76?±?3.06?μmol?Lsup?1/sup). The lowest BSi concentration of 2.93?±?1.34?μmol?Lsup?1/sup was observed in winter. Based on sup234/supTh/sup238/supU disequilibria, the average BSi sinking fluxes were 7.08?±?8.62, 10.01?±?13.95, and 8.30?±?13.06?mmol?Si?msup?2/sup?dsup?1/sup in spring, summer, and autumn, respectively. The lowest flux of 4.19?±?3.98?mmol?Si?msup?2/sup?dsup?1/sup was measured in winter. Together with nitrogen fluxes, the Si:N sinking ratios were 0.8:1.0, 1.5:1.0, 1.6:1.0, and 1.4:1.0 in spring, summer, autumn, and winter, respectively, indicating that particle sinking induces the faster removal of Si compared to N in Daya Bay.
机译：摘要沿海海洋占海洋环境中生物二氧化硅（BSi）产量的50％以上。但是，对BSi下沉的了解很少。在这里，在南海北部的大亚湾，调查了BSi的丰度和下沉通量的季节性变化。 BSi的最高浓度发生在夏季，平均为8.04？±？5.48？μmol？L ？1 （±SD），随后是秋天（5.51？±？3.11？μmol？L ？1 ）和弹簧（3.76？±？3.06？μmol？L ？1 ）。冬季最低的BSi浓度为2.93？±？1.34？μmol？L ？1 。基于 234 Th / 238 U不平衡，平均BSi沉降通量为7.08？±？8.62、10.01？±？13.95和8.30？±？13.06？mmol？ Si？m ？2 ？d ？1 分别在春季，夏季和秋季。冬季测得的最低通量为4.19±±3.98？mmol？Si？m ？2 ？d ？1 。连同氮通量，春季，夏季，秋季和冬季的Si：N下沉比率分别为0.8：1.0、1.5：1.0、1.6：1.0和1.4：1.0，这表明颗粒下沉会促使更快地去除Si。相比大亚湾的N。

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