Physical Acoustics: Evidence for short temporal atmospheric variations observed by infrasonic signals

24 May - 24 May 2023

2:00 pm - 3:00 pm

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Gil Averbuch
Gil Averbuch
Postdoc Scholar
Applied Ocean Physics & Engineering
Woods Hole Oceanographic Institution (WHOI)
In this presentation, I will demonstrate the use of tropospheric and stratospheric infrasound detections from a repetitive source to estimate the effect of the atmosphere’s temporal variability on infrasound. Based on source-receiver pairs, the empirical Green’s function is calculated every 20 seconds for 52 events; these allow generating a set of synthetic signals where variations are ascribed to variation in the atmosphere. In addition, observations are compared with numerical simulation results based on realistic atmospheric conditions. Results show that variations of infrasound signals are observed over time scales ranging from tens of seconds to minutes and have dominant periods ranging from tens to hundreds of seconds. These results motivate using infrasound to probe short temporal changes in the lower and middle atmosphere and study their underlying phenomena.
Corresponding papers:
BSc & MSc in Geophysics from Tel Aviv University, Israel.
PhD in Applyed Geophisics from TU Delft, The Netherlands.
I am a seismo-acoustic (SA) researcher working on the coupling of seismic and acoustic waves between the solid Earth, ocean, and atmosphere. My research focuses on utilizing SA observations to detect and characterize its sources and study the properties of the different media. For that, I use analytic and numerical methods, measurement campaigns to collect data, and various signal-processing techniques. Before starting at the Woods Hole Oceanographic Institution (WHOI), my research focused on atmospheric infrasound (0.01-20 Hz sound waves). Specifically, I worked on SA coupling between the solid Earth and the atmosphere, source characteristics, as well as using infrasound data to study short temporal variability of the dynamic atmosphere. I joined WHOI, intending to expand my knowledge and experience in ocean- and environmental-related studies, and my current research focuses on 3D spatio-temporal acoustic source localization, long-range acoustic propagation in the ocean, climatic effects on the global SA ambient wavefield, SA monitoring of offshore wind turbines, and SA coupling on Venus and acoustic propagation through its supercritical atmosphere (pressure and temperature above the critical point).
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Posted on 24th April 2023 in Physical Acoustics, Events