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Abstract

Cruises are made monthly to the WOCE deep-water station, about 100 km north of Oahu, Hawaii. During these cruises, the principal causes of variability in dynamic height are the internal tides having a range about 30% of the annual range in dynamic height. The internal tides have peak-to-peak vertical displacements of up to 30 dbar but show little vertical coherence. At the diurnal frequencies modal fits typically require 6 to 8 baroclinic modes to account for 90% of the variance, suggesting that the diurnal tide should not be described in terms of dynamic modes. The semi-diurnal tide, has about 2 to 3 times the amplitude of the diurnal tide, and shows more vertical phase coherence, but still requires 2 or 3 modes to describe it. Generally, the dominant mode is the second or third mode.

 


Reference:

1994 Chiswell, S. M., Vertical Structure of the baroclinic tides in the Central North Pacific Subtropical Gyre J. Phys. Oceanogr., 24(9), 2032-2039.

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