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The observed variability of zonal currents (ZC) at the Equator, 90°E shows a strong seasonal cycle in the near-surface 40–350 m water column with periodic east–west reversals most pronounced at semiannual frequency. Superposed on this, a strong intraseasonal variability of 30–90 day periodicity is also prominently seen in the near-surface layer (40–80 m) almost throughout the year with the only exception...
In the Indian Ocean, the observed variability of meridional currents (MC) at the Equator, 90°E shows distinct 10–20 day (quasi-biweekly) north–south reversals in the near-surface 40–350 m water column. Unlike the zonal currents, the seasonal variability in the MC field is strikingly absent in the annual cycle over this water column. However, the strong amplitude oscillations penetrate deep during...
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