The Coriolis force does not decide which way your sink drains, but at ocean scale it decides everything: gyres turn clockwise in the Northern Hemisphere and anticlockwise in the Southern, the same mechanism flipped. When the Moon lines up with the Sun, the two tidal pulls add together into spring tides. El Nino and La Nina, meanwhile, shift the whole equatorial warm pool and switch the Peruvian upwelling on and off.
The Coriolis force does not decide which way your sink drains, but at ocean scale it decides everything: gyres turn clockwise in the Northern Hemisphere and anticlockwise in the Southern, the same mechanism flipped. When the Moon lines up with the Sun, the two tidal pulls add together into spring tides. El Nino and La Nina, meanwhile, shift the whole equatorial warm pool and switch the Peruvian upwelling on and off.
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