PAL
Passive Aquatic Listener

The Passive Aquatic Listening (PAL) is a passive underwater acoustic recorder that measures precipitation rates and winds over the ocean. It captures underwater ambient noise time series and transforms them into a multi-frequency (1-50 kHz) spectrum of sound pressure levels (SPLs). These SPLs help determine the intensity of ocean sounds, such as raindrops and surface winds, which are used to estimate rain rates and wind speeds. PAL provides data in a 4.5-second time series at a sampling frequency of 100 kHz. It can be deployed on moored buoys and floats.