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首页> 外文期刊>Journal of oceanography >Characteristics of the ratio of dissolved cadmium to phosphate in subtropical coastal waters of Ishigaki Island, Okinawa, Japan
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Characteristics of the ratio of dissolved cadmium to phosphate in subtropical coastal waters of Ishigaki Island, Okinawa, Japan

机译：日本冲绳石垣岛亚热带沿海水域中溶解镉与磷酸盐的比率特征

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摘要

The ratio of dissolved cadmium (Cd) to phosphate (PO4) in the subtropical coastal area of Ishigaki Island, Okinawa, Japan, was investigated. Twenty vertical seawater samplings were carried out once a month from May 2008 to January 2010. In order to examine how the Cd/PO4 ratio in seawater varies with the oceanographic conditions (i.e., the water temperature–salinity characteristics), the water masses at the study sites were classified into two types: group 1 with a water temperature of >25°C and a salinity range of 34.0–34.4, and group 2 with a water temperature of <25°C and a salinity of >34.4. A different phytoplankton assemblage was observed in each water mass defined. Different Cd/PO4 ratios were obtained for the two water mass types, due to the differences between the types in terms of the environmental conditions such as the water temperature–salinity (T–S) characteristics and phytoplankton assemblages, as well as possible variations in the concentrations of dissolved iron, zinc, manganese, and CO2 in seawater in each water mass.
机译：研究了日本冲绳县石垣岛亚热带沿海地区溶解的镉（Cd）与磷酸盐（PO4）的比率。从2008年5月到2010年1月，每月进行20次垂直海水采样。为了研究海水中Cd / PO4的比例如何随海洋条件（即水温-盐度特性）的变化而变化。研究地点分为两种类型：水温> 25°C和盐度范围34.0–34.4的第1组和水温<25°C和盐度> 34.4的第2组。在确定的每个水团中观察到了不同的浮游植物组合。由于两种水质类型之间在环境条件方面的差异（例如水温-盐度（TS）特性和浮游植物组合以及水体中可能的变化），因此获得了不同的Cd / PO4比。每个水团中海水中溶解的铁，锌，锰和CO2的浓度。

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