Deep-Sea Tides 1250 Kilometers off Baja California

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Science  28 Aug 1970:
Vol. 169, Issue 3948, pp. 862-864
DOI: 10.1126/science.169.3948.862


The tidal pressure fluctuations on the sea floor were read by a sensitive optical sensor that detects the rotations of a multiturn Bourdon helix. The record was analyzed in terms of the transfer functions between tidal elevations and gravitational driving. Off California, the semidiurnal tide attenuates considerably faster than the diurnal tide. Neither species satisfies the rate of decay expected from a Kelvin wave.

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