Upward looking sonar
From Infogalactic: the planetary knowledge core
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An upward looking sonar (ULS) is a sonar device pointed upwards looking towards the surface of the sea. It is used for similar purposes as downward looking sonar, but has some unique applications such as measuring sea ice depth and concentration [1] or measuring air entrainment from bubble plumes during rough seas.
Often it is moored on the bottom of the ocean or floats on a taut line mooring at a constant depth of perhaps 100 m. They may also be used by submarines, AUVs, and floats such as the Argo float.
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