Analysis of tidal internal wave propagation in the north pacific with lagrangian and eulerian current meter techniques

摘要

Strong semidiurnal internal waves are generated over the Emperor Ridge in the North Pacific. The waves propagate in both directions east and west of the ridge. The propagation and dissipation of the waves west of the ridge is studied on the basisof data obtained during a Russian large scale moored experiment "MEGAPOLYGON". The current meter measurements were performed from 170 moored buoys set for two months in the northwest Pacific. Amplitudes, wave lengths, direction and variability of tidalinternal waves, and their variability were studied on the basis of these data. The cluster of moorings serves as an antenna to measure the wave length and the directions of the waves. The amplitudes of the waves are calculated from the temperatureoscillations registered at the moored stations divided by the mean vertical temperature gradient. East of the ridge the same parameters were studied using the data of the US moorings. A chart of the area with positions of the moorings and the MEGAPOLYGONstudy area is shown in Fig. 1.