Modeling of topographically amplified diurnal tides in the Nordic seas

Abstract

Diurnal tidal constituents K1 and O1 are calculated in the Nordic seas with a numerical space grid of about 10 km. This allows resolution of the structure of enhanced tidal currents generated by near-resonant topographic vorticity waves at the Yermak Plateau. The resonance properties of the Yermak Plateau are investigated in the period range 20-30 h. The main resonance peak is close to the 26-h period, and the resonance curve envelops a wide range of periods. This broad resonance peak explains the enhancement of both diurnal tidal components separated by a 2-h difference and the stability of the resonance phenomena. The model results describe well the observed flow pattern over the Yermak Plateau, including the current ellipse rotation. -Author