Acoustic signal horizontal coherence variability: Relationship to internal tide and storm events

Acoustic signal horizontal coherence has been extracted from a 31-day data set taken during the late fall/early winter time period. The coherence variability for both 300- and 500-Hz acoustic signals appears coupled to shelf/slope frontal motion, internal tides, and associate internal waves as well as changes in the surface gravity field. Acoustic signal and environmental data illustrating the coupling will be presented. The data were taken on the New Jersey Shelf with a 460-m-long bottomed array placed in ∼89 m of water. The cross shelf propagation range was ∼20 km. The acoustic sources were in ∼60 m of water.