D. Zitterbart

Azipod-equipped vessels in the Antarctic Peninsula radiate underwater continuous mid-frequency narrowband and tonal sounds.

It is commonly accepted that ocean noise from marine traffic is mostly confined to low frequencies. This article empirically demonstrates that large (length >120 m) vessels equipped with electrically driven "Azipod" propulsion systems generate loud mid-frequency (3-15 kHz) tonal and mid-frequency narrowband and tonal s...