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1 Introduction The Sound Fixing and Ranging (SOFAR) channel in the ocean allows for sound to travel thousands of kilometers, making it particularly useful for detecting underwater nuclear explosions (Lawrence, 1999). The SOFAR-like, omnidirectional, acoustic duct in the atmosphere was first modeled over 15 years ago (Drob et al., 2003). Similar to the ocean, this acoustic duct corresponds to an area of minimum effective sound speed.
The ocean microbarom is an acoustic signal generated via nonlinear interaction of ocean surface waves. It can propagate for thousands of kilometers and represents a significant infrasonic noise source for ground infrasound stations across the globe. However, wind noise often compromises detections at ground stations. Furthermore, the microbarom may travel in elevated acoustic ducts that do not transmit enough energy for detections on ground stations.
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