"Diel migration of sound scatterers into, and out of, the Cariaco Trenc" by Donald F. Wilson
 

Abstract

Acoustic measurements at 25 kHz show that a well-defined sound-scattering layer in the Cariaco Trench migrates down in the early morning to the oxic-anoxic interface and splits into two components: one remains in oxygen-deficient water above the interface; the other penetrates several hundred meters into the anoxic hydrogen sulfide- and methane-containing region of the water column....

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