22.Michida, Y. and H. Yoritaka
  Surface currents in the areas of Indo-Pacific Throughflow and in the Tropical Indian Ocean observed with surface drifters
  Journal of Geophysical Research,101 C5,12475-12482,1996.


The location data set of 31 surface drifters deployed in the Indian Ocean between
1990 and 1993 are analyzed to illustrate the surface current field and its seasonal
changes in the tropical Indian Ocean and the area of Indo-Pacific throughflow.
Trajectories of drifters, daily drifting velocities, and grid-averaged velocities
are described and compared with published climatologies of the surface currents
in the Indian Ocean and numerically simulated flows in the Indonesian Seas.
The surface current field and its seasonal changes in the Indian Ocean derived
from drifter data are generally consistent with the published climatologies.
Zonal velocities computed from the drifter data set in the equatorial jet, which
appears twice a year in the transition periods of the monsoon, are greater than
previous estimations. Surface currents flowing from the Indian Ocean toward
Indonesian Seas in boreal winter, in the opposite direction from that observed
during other seasons, are traced with drifters deployed in the region south of
the Indonesian archipelago. In particular, a drifter passing from the Indian Ocean
to the Flores Sea through Lombok Strait in December 1993 is consistent with
numerical modeling which shows northward flow in the Lombok Strait in boreal
winter.




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