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Apparent biological fractionation between Cd and PO_4 in the surface waters of the equatorial Pacific Ocean

机译：赤道太平洋表层水中Cd和PO_4之间的表观生物分离

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Apparent biological fractionation between cadmium (Cd) and phosphate (PO_4) in seawater from 10 to 200 m in the western and central equatorial Pacific was examined in January 2003 at nine stations. In this study period, a surface salinity front existed at approximately 175°W, dividing oceanographic conditions into two types: the Western Pacific Warm Pool (WPWP) (westward) and the eastern upwelling zone (eastward), and, at a depth of approximately 100-150 m, a thermocline developed, separating the surface water from the nutrient-rich deep water. Based on the temperature distribution, three types of water masses were defined: within the WPWP ( > 29.2℃), outside the WPWP above the top of the thermocline (the top of the thermocline is the water depth at which the temperature is 1℃ lower than the surface temperature), and below the top of the thermocline, generally corresponding to PO_4 concentrations of less than 0.25 μM, from 0.25 μM to 0.50 μM, and over 0.50 μM, respectively. The fractionation coefficient values were determined to be 0.36, 1.09, and 1.68 for the three layers defined, respectively, on the assumption that the uptake and regeneration processes of Cd and PO_4 by the biological activity obeyed first-order reaction kinetics. Similarly, Hagino et al. (2000) [Hagino, K., Okada, H., Matsuoka, H. (2000). Spatial dynamics of coccolithophore assemblages in the Equatorial Western-Central Pacific Ocean. Marine Micropaleontology 39, 53-72] have previously found that planktonic coccolithophorid assemblages in these waters also differ between these water masses, presumably discriminating among the three layers when selecting their habitat. By analogy, I speculate that the fractionation coefficient between the two constituents Cd and PO_4 varies according to differential uptake/regeneration of the species assembly in these populations of primary producers (and grazers), where sheer biomass and environmental conditions likely also play a role.
机译：2003年1月在赤道中西部太平洋中部10 m至200 m海水中的镉（Cd）和磷酸盐（PO_4）之间的表观生物分离研究。在本研究期间，地表盐度前沿存在于大约175°W处，将海洋条件分为两种类型：西太平洋暖池（WPWP）（向西）和东部上升区（向东），并且深度约为100-150 m，开发了温跃层，将地表水与营养丰富的深层水分开。根据温度分布，定义了三种类型的水团：WPWP内（> 29.2℃），WPWP之外的温床上方（温床的顶部是温度低1℃时的水深） （比表面温度高），并且在热跃线顶部以下，分别对应于PO_4浓度分别小于0.25μM，0.25μM至0.50μM和超过0.50μM。假设定义的三个层的分馏系数值分别为0.36、1.09和1.68，假定生物活性对Cd和PO_4的吸收和再生过程符合一级反应动力学。同样，Hagino等。 （2000）[Hagino，K.，Okada，H.，Matsuoka，H.（2000）。赤道西-中太平洋太平洋球石藻组合的空间动力学。海洋微古生物学39，53-72]以前已经发现这些水体中的浮游球墨鱼鳞茎组合在这些水体之间也有所不同，大概是在选择它们的栖息地时在三层之间进行区分。通过类推，我推测两种成分Cd和PO_4之间的分馏系数根据这些初级生产者（和放牧者）种群中物种组装的不同吸收/再生而变化，在这些种群中纯粹的生物量和环境条件也可能起作用。

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