Drifter tracks obtained from AOML as kriged positions. 1045 drifter tracks were found in the region 120°E to the coast, 25°S-30°N, and these contained 485752 kriged 6-hourly samples (drogue-on drifters only).
Velocity components were gridded to a 1°x1°xmonthly grid using Gaussian mapping with scales of 2°longitude, 1°latitude and 2 months, to make an average annual cycle.
Work done trying to replicate this result, using kriged positions east of 120°W (same data as in part 1 above):
Bottom line: I can't duplicate Poulain's result.