Transit Cruise

NOPP-GIW

We propose to collect high-frequency in situ measurements that can resolve the energy flux associated with internal waves propagating through the deep ocean by combining high vertical-resolution moorings to resolve the waves# modal structure with an antenna of vertically-integrated measures of variability to resolve the speed and direction of beam propagation. This proposal will instrument one internal-wave resolving (IWR) array that is re-deployable to multiple locations. The IWR Array proposed here comprises two pressure-sensor equipped inverted echo sounders (PIESs) and five PIESs with an additional current-sensor on each (CPIESs) and a densely instrumented, full-depth mooring. The C/PIES antenna will allow for the detection and separation of low-mode internal waves propagating from multiple directions, while the mooring will measure velocity and vertical displacement signals of five or more vertical modes. The array has been designed, and the data will be examined, in cooperation with a numerical modeling team (see the Buijsman et al. NOPP submission from our collaborators at USM, University of Michigan; U-M, and the Naval Research Laboratory; NRL) allowing for skill-testing and direct comparison with the global internal-tide resolving models that serve as inputs to regional models of the coastal ocean.