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Report No.

Vertical distributions of $$^{230}$$Th in the Pacific Ocean and their relation to advection and diffusion

Okubo, Ayako; Obata, Hajime*; Gamo, Toshitaka*; Yamada, Masatoshi*

We investigated the vertical distribution of total $$^{230}$$Th in mid latitudes of the Pacific Ocean. The west to east section of $$^{230}$$Th shows a strong gradient in the deep waters around 170 degree east and 110 degree west. At depths of 2000 to 4000 m and 4000 m to bottom within the time-scale of scavenging residence time of $$^{230}$$Th, the horizontal eddy diffusion could reach 1100 to 1400 km and 400 to 700 km, respectively. The horizontal eddy diffusion transport is too weak to affect Th distribution in the deep layers between each station in this study area.



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