Origin of the Intraseasonal Current Variability and Its Interannual Modulation at 1,000 m Depth in the Eastern Equatorial Pacific Ocean

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Intraseasonal variability in the eastern Pacific shows significant seasonality with peaks during boreal winter.
Analysis of meridional eddy kinetic energy at 1,000 m depth shows clear interannual variation of the DEIV.
Upper-layer intraseasonal variability is linked to tropical instability waves and shows high correlation with meridional EKE.
Numerical simulations indicate that non-La Niña years allow for the generation of Yanai waves, forming the DEIV.

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Observational analysis reveals interannual modulation of intraseasonal variability in the eastern Pacific, suggesting links to upper-ocean dynamics.

Terada et al. (2025) studied this question.

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Observational analysis reveals interannual modulation of intraseasonal variability in the eastern Pacific, suggesting links to upper-ocean dynamics.