Title: Contrasting the dynamics of upwelling annual cycle in the equatorial Pacific and Atlantic


Prof Li-Chiao Wang (Department of Atmospheric Sciences, National Central University)

Abstract
========
The dynamics of upwelling annual cycle in the equatorial Pacific and Atlantic region is explored and contrasted through a weighting theory, based on the framework of Zebiak-Cane (ZC) ocean model, as a combination of the local wind-driven Ekman upwelling and remote wind-driven wave upwelling. The results demonstrated that the equatorial Pacific upwelling annual cycle is dominated by the local wind-driven Ekman upwelling, which agrees with the previous related findings. On the other hand, the equatorial Atlantic upwelling annual cycle is found to be jointly controlled by two processes: the Ekman upwelling in the west and the wave upwelling in the east. The wave upwelling, which plays an important role in the development of cold tongue in the eastern equatorial Atlantic, could be further connected to shoaling and deepening of the thermocline resulting from equatorial mass meriodinal recharge/discharge and zonal redistribution processes associated with wind-driven equatorial ocean wave dynamics.