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      https://www.ias.ac.in/article/fulltext/jess/130/0075

    • Keywords

       

      Equatorial Indian Ocean; IndOOS; RAMA; ADCPs; Wyrtki Jet; bottom currents; semi-annual cycle; intraseasonal variability; biweekly oscillations.

    • 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$^{\circ}$E, 83$^{\circ}$E, and 93$^{\circ}$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.

      $\bf{Highlights}$

      $\bullet$ Twenty years of ocean current data collected at the equatorial Indian Ocean

      $\bullet$ Bottom current data show strong intraseasonal variability

      $\bullet$ Upward phase propagation associated with the semi-annual cycle more prominent for the mid-depth currents

      $\bullet$ The semi-annual reversals not evident every year near the surface

    • Author Affiliations

       

      VINEET JAIN1 AMOL P2 APARNA S G1 FERNANDO V1 KANKONKAR A2 MURTY V S N2 ALMEIDA A M1 AREEF A SARDAR1 KHALAP S T1 SATELKAR N P1 GHATKAR S1 TARI P A1 GAONKAR M G1 KHEDEKAR R1

      1. CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, India.1 1
      2. CSIR-National Institute of Oceanography Regional Centre, Visakhapatnam, India.
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    • Supplementary Material

       
  • Journal of Earth System Science | News

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