Sensing of the ocean with deep acoustic landers and profilers

The Deep Acoustic Lander is an autonomous instrument capable of descending to the deepest depths of the world?s ocean, capturing the, spatial coherence and variability of the ambient sound field from the surface to the bottom. This information is exploited to dete,rmine the contributions of various underwater sources to the total sound field as a function of frequency, depth, and time. Further, modelling is used to determine properties of the ocean, such as the sea state, sound speed profile, seabed composition, and seawate,r acidity. This technology is ideal for exploring and remotely studying natural processes in the deep ocean, such as the structure,and time evolution of hydrothermal vents through the sound they produce.