• VINEET JAIN

      Articles written in Journal of Earth System Science

    • Two decades of current observations in the equatorial Indian Ocean

      VINEET JAIN AMOL P APARNA S G FERNANDO V KANKONKAR A MURTY V S N ALMEIDA A M AREEF A SARDAR KHALAP S T SATELKAR N P GHATKAR S TARI P A GAONKAR M G KHEDEKAR R

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      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

    • Observed current variability in Gulf of Mannar

      VINEET JAIN P AMOL V FERNANDO G SMICHAEL S G APARNA A KANKONKAR P A TARI M G GAONKAR N P SATELKAR S T KHALAP

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      We present current data from an acoustic Doppler current profiler (ADCP) moored on the continental shelf-break in the Gulf of Mannar (GoM) near Ram Setu during 2010–2011. The observations show that the near-surface, sub-inertial current flows primarily north-westward all round the year. This northwestward flow is punctuated by intraseasonal bursts that last a few weeks. Compared to the current off Kanyakumari, the intraseasonal fluctuations in the GoM are weaker and in the opposite direction. The flip in direction is linked to eddy-like circulations, which cause the current to bifurcate or merge in the region between Kanyakumari and Ram Setu.

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