Two Decades of Current Observations in the Equatorial Indian Ocean

Deep-sea moorings in the equatorial Indian Ocean were first deployed by India in the year 2000, and currents were measured at three locations ( $$77^\circ \hbox {E}$$ , $$83^\circ \hbox {E}$$ , and $$93^\circ \hbox {E}$$ ) on the equator. In this paper, we present two decades of current observations from these moorings and discuss how the moorings have evolved with time. The observations show that the 180-day (90-day) period dominates the surface and mid-depth (bottom) circulation. Though the Wyrtki Jets are strong, the near-surface currents do not show any clear semi-annual reversals. The reversals become evident only below 100 m.