Separate Lanthanide Tetrad Effects in Two Seawater Columns from the North West Pacific

A Peculiarity of the Fourth Lanthanide Tetrad under a Certain Condition

Abstract

Vertical profiles of three separate lanthanide tetrad effects, ABEXEL, ABEX-3 and ABEX-4 in two seawater columns representing the subtropical and subpolar areas of the North West Pacific have been studied in connection with the hydrographical data. The depth profiles of ABEX-4 show remarkable difference between the subtropical and subpolar columns. The change of ABEX-4 between 640 and 1000m at the subtropical site appears to be related to the discontinuous change in salinity between the corresponding depths. Besides, in general the gross features of the depth profile of ABEX-4 appears different from those of ABEXEL and ABEX-3.