• S R Shetye

      Articles written in Journal of Earth System Science

    • Seasonal cycle of surface circulation in the coastal North Indian Ocean

      S R Shetye S Satheesh Chandra Shenoi

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      Monthly-mean winds and currents have been used to identify the driving mechanisms of seasonal coastal circulation in the North Indian Ocean. The main conclusions are: (i) the surface circulation off Arabia is typical of a wind-driven system with similar patterns of longshore current and wind stress; (ii) circulation off the west coast of India is consistent with the dynamics of a wind-driven eastern boundary current only during the southwest monsoon. During the northeast monsoon it is possible that the influence of the interior flow is important. (iii) There are at least three mechanisms that influence the surface circulation off the east coast of India: wind-stress, influence of fresh-water run off and contribution of the interior flow. It is difficult at present to assess the relative importance of these three processes.

    • Satellite-tracked drifting buoy observations in the south equatorial current in the Indian Ocean

      S R Shetye G S Michael

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      Three satellite-tracked drifting buoys released in the south equatorial current in the Indian Ocean followed the path of the current moving westward approximately zonally in the vicinity of 10 S latitude. On nearing the east coast of Africa two buoys moved north and the third moved south. Over the open sea regime the buoys moved with a speed of approximately 30 cm/s at an angle of about 35° to the left of the wind. The overall tendencies seen in the buoy drift are similar to those observed elsewhere in the world oceans.

    • Circulation in the region of the West India Coastal Current in March 1994 hydrographic and altimeter data


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      The West India Coastal Current (WICC) flows southward (northward) during summer (winter). We examine the nature of circulation in the region of WICC during an inter-monsoon period using hydrographic data collected during March 6–21, 1994, and archived 1994 daily altimeter data. The hydrographic data did not show any organized northward or southward Cow, implying that the amplitudes of the Rossby and Kelvin waves that make the WICC were negligible. Instead, cyclonic and anticyclonic eddies, well recorded in altimeter data, dominated the circulation. Because eddies occur throughout the year, our analysis highlights the need to study their role in WICC all through the year.

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