在南海渚碧珊瑚礁坪的上层水中存在大量的 210Po 过剩。
A large excess of 210Po in the overlying water of the Zhubi Coral Reef flat, in the South China Sea.
机构信息
Department of Oceanography, Xiamen University, Xiamen 361005, China.
出版信息
Mar Pollut Bull. 2011 May;62(5):912-7. doi: 10.1016/j.marpolbul.2011.02.057. Epub 2011 Mar 27.
The temporal variability of (210)Po and (210)Pb was examined in the overlying water of the Zhubi Coral Reef flat to detect nutrient-like behavior of (210)Po. Different mechanisms influencing their geochemical behaviors were observed. Excess (210)Po relative to (210)Pb revealed an additional input of (210)Po other than in situ production from (210)Pb. The (210)Po input comes from the reef flat sediment through diffusion. The diffusion contributes 62% of the total (210)Po. This diffusion of (210)Po directly highlights its nutrient-like behavior. No input, but the slight removal, of (210)Pb was observed. Fractionation factors indicate that particulate matter prefers to adsorb (210)Po rather than (210)Pb. In combination with particulate composition, (210)Po diffusion was closely related to organic matter. These results reveal that (210)Po might be a potential tracer for quantifying nutrient recycling in the Coral Reef system.
研究了竹碧珊瑚礁坪上层水中的（210）Po 和（210）Pb 的时间变化，以检测（210）Po 是否具有类似营养物的行为。观察到不同的机制影响它们的地球化学行为。过剩的（210）Po 相对于（210）Pb 表明除了来自（210）Pb 的原地生产之外，还有其他来源的（210）Po 输入。（210）Po 的输入来自珊瑚礁坪沉积物通过扩散。扩散贡献了总（210）Po 的 62%。这种（210）Po 的扩散直接突出了其类似营养物的行为。没有观察到（210）Pb 的输入，但有轻微的去除。分馏因子表明，颗粒物更倾向于吸附（210）Po 而不是（210）Pb。结合颗粒物组成，（210）Po 的扩散与有机物密切相关。这些结果表明，（210）Po 可能是量化珊瑚礁系统中营养物再循环的潜在示踪剂。
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