Two Decades of Current Observations in the Equatorial Indian Ocean
Proceedings of the Indian Academy of Sciences Earth and planetary sciences/Journal of earth system science(2021)
Abstract
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.
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Key words
Equatorial Indian Ocean,IndOOS,RAMA,ADCPs,Wyrtki Jet,bottom currents,semi-annual cycle,intraseasonal variability,biweekly oscillations
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