Abstract

M2 tidal currents observed at 315 deep-sea locations (mostly in the northern hemisphere) confirm those computed by the numerical model Of SCHWIDERSKI (1979, Naval Surface Weapons Center, Dahlgren, VA. TR 79-414). Together, they reveal large-scale geographical coherence~ similar in form to those of the tide-generating potential and to those of the analytical Laplace model for tides on a globe completely covered with water of uniform depth.By fitting the Laplace tidal ellipses to the array of current meters and to the velocities from Schwiderski's numerical model, we show that much of the MZ tide is explicable in terms of Laplace's simple model-with friction.

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