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by roter 1132 days ago
Coriolis. There are timescales set up by two big mechanisms: one is westward-propagating oceanic Rossby [0] waves just to the north and south of the equator and the other is eastward-propagating Kelvin [1] waves along the equator which hit the Peruvian coast, split in two and flow north and south bouncing along the coast. Sloshing back and forth.

[0] https://en.m.wikipedia.org/wiki/Rossby_wave

[1] https://en.m.wikipedia.org/wiki/Kelvin_wave