Anomalous transparency of water-air interface for low-frequency sound
Oleg A. Godin
Abstract
Sound transmission through water-air interface is normally weak because of a strong mass density contrast. Here we show that the transparency of the interface increases dramatically at low frequencies. Rather counterintuitively, almost all acoustic energy emitted by a sufficiently shallow monopole source under water is predicted to be radiated into atmosphere. Physically, increased transparency at lower frequencies is due to the increasing role of inhomogeneous waves and a destructive interference of direct and surface-reflected waves under water. The phenomenon of anomalous transparency has significant implications for acoustic communication across the water-air interface, generation of ambient noise, and detection of underwater explosions.
Create a lesson
Related papers
Bridging short- and medium-range weather forecasting with machine learning
Timothy A. Smith, Mariah Pope, Sergey Frolov et al.
Detectability of Forced ENSO Changes under Global Warming: Insights from the Recharge Oscillator
Sooman Han, Jérôme Vialard, Alexey V. Fedorov et al.
When Does Forecast-Error Energy Grow Logistically in Geophysical Turbulence?
Malaquias Peña
A place for stabilization alongside tipping cascades: the AMOC-cryosphere system
Sacha Sinet
Missing the Butterfly and Predicting the Past: Features or Bugs of Accurate AI Weather Models?
Pedram Hassanzadeh, Weidong Li, Y. Qiang Sun et al.
AICON: An operational global machine learning weather forecasting model
Tobias Goecke, Marek Jacob, Florian Prill et al.