Abstract
Current meter data from various depths near the sea bottom collected for about 1 year at time
intervals of 1 hour using subsurface buoysystem at a depth at 2,257m on the southeast off of
Minami-torishima island, Japan have been analyzed. The results show the existence of Ekman
layer in May. During this month, Ekman layer thickness and eddy viscosity are estimated using
the angle between 3m and 5m above the sea bottom as follows;
Ekman layer thickness: 4.4～7.4m; Eddy viscosity: 0.5～1.4cm＾2/sec
