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A Novel Approach for the Reconstruction of Microbarom Soundscapes

Session: Infrasound and the Seismo-Acoustic Wavefield I

Type: Oral

Date: 4/20/2021

Presentation Time: 09:45 AM Pacific

Description: 

A comparison is made between in-situ infrasound recordings in the microbarom band and simulations using a microbarom source model. The recordings are obtained by the 'Infrasound-Logger' (IL), a miniature sensor deployed as a biologger near the Crozet Islands in January 2020. The sensors provide barometric and differential pressure observations obtained directly above the sea surface. As the full wavefield consists of multiple spatially distributed sources, a method is introduced to account for all microbarom source contributions surrounding the IL appropriately. In this method, the realistic source field is coupled to a semi-empirical propagation model to consider the entire radiating sea-surface area. While the method relies on several assumptions, a good agreement can be observed: the reconstructed soundscape is found to be within +-5 dB for 80% of the measurements in the microbarom band of 0.1-0.3 Hz. Microbarom soundscapes are essential for understanding the ambient infrasonic noise field, and infrasonic remote sensing of the upper atmosphere. Moreover, insights in the ambient noise field will improve natural hazards monitoring and verify the Comprehensive Nuclear-Test-Ban Treaty.

Presenting Author: Olivier F. C. den Ouden

Student Presenter: Yes

Authors