The float was launched in a traid with NPS#67 and NPS#68 south of 36° N-parallel above the 1000-m isobath in an alongshore row about 20 km off the coastline. The distance between the points in the row was ~ 10 km (Figure 1).

After the launch the float entrened an eddy which might break away from the undercurrent (Figure 2). While in the eddy the float was translated southward making consecutive cyclonic loops with the following characteristics:


Number of loops 8
Diameter, km 40.4
Duration, days 191
Period, days 24
Swirl velocity, cm/s 6.1
Translation velocity, cm/s 1.2
Direction, degrees 222
Rossby number 0.04



At 33.5° N the float reversed the direction, moved northward to 35°, then eastward and on July 4, 1999 was entrained in the undercurrent almost near the launch point.
On July 25, 1999 the float entered an anticyclonic eddy and turned offshore west of San Francisco (Figure 4). It was moving westward and made two series of anticyclonic loops described below.

Number of loops 2 2
Diameter, km 35.4 168.7
Duration, days 26 115.5
Period, days 13 57.8
Swirl velocity, cm/s 9.9 10.6
Translation velocity, cm/s 1.1 0.5
Direction, degrees 112 236
Rossby number 0.06 0.01


The float remained in the eddy till the end of the mission.

The float was ballasted for 275 dbar, but the real depth reached by the float was deeper: 404.6 ± 5.6 dbar till September 5, 1999. After that the float steady rosy to ~380 dbar (Figure 3). This change coincides in time with looper#2 (Figure 4b)