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Advanced Taiwan Ocean Prediction System

Tseng, Tsu-Lun - ALL News | 2017-11-13 | Count:16

 

Title: A Dynamic Study of Seasonal Upwelling in the Equatorial Atlantic Region

Abstract:

A simple theory is proposed based on the framework of the Zebiak-Cane model to demonstrate that the equatorial upwelling seasonal cycle is controlled by both the locally wind-driven Ekman process and remotely wave-induced effect. It is demonstrated that in the equatorial Atlantic region this upwelling is dominated by Ekman processing in the west, whereas in the east it is primarily owing to shoaling and deepening of the thermocline resulting from equatorial mass meridional recharge/discharge and zonal redistribution processes associated with wind-driven equatorial ocean waves. This theory provides a useful tool to understand the dynamics of the equatorial upwelling seasonal cycle, which plays an important role in the development of the sea surface temperature seasonal cycle in the equatorial cold tongue region.

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