Journal of Oceanography, Vol. 61 (No. 4), pp. 783-788, 2005Short Contribution
Ishigaki Tropical Station, Seikai National Fisheries Research Institute, Fukai-Ota, Ishigaki 907-0451, Japan
(Received 5 July 2004; in revised form 12 October 2004; accepted 14 October 2004)
Abstract: Variation in the cadmium (Cd) concentration related to phosphate (PO4) in the surface layer (0-150 m) of the equatorial Pacific (175°E, 170°W, and 160°W) was investigated in January of 2001 and 2002. A plot of Cd against PO4 from 0 to 150 m showed good linearity, and plotted points shifted in the direction of the origin along the regression line from 2001 to 2002. The variation of the Cd concentration in the surface layer was attributed to biological uptake-regeneration, the variation of sub-surface water concentration, and the upwelling effect at each station in connection with the El Niño phenomenon.