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Eulerian mean velocity field of south Indian Ocean is estimated with a resolution of 1/3 x 1/3 degree in latitude and longitude by combining satellite altimeter and surface drifting buoy observations.... High resolution maps of sea level anomaly (merged T/P or JASON and ERS1/2 or Envisat) and the surface drifter data from the Global Drifter. Program during 1993 January - 2004 January have been utilized. Mean winds fields measured by scatterometers onboard ERS/Quikscat is used for computing the wind-driven Ekman current. The estimated mean velocity field illustrates strong boundary currents, zonal currents and weak flows prevail at the central part. The Agulhas Current velocity even reaches 2 m/s at around 35°S. The estimated field tends to be smaller than simple averages of drifter-derived velocities for both the boundary currents and the zonal flow, where the anomaly field dominates. Comparison of the instantaneous velocity field estimated using the mean field and the available Acoustic Doppler Current Profilers depict better correlation.続きを見る
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