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Atmospheric infrasound generation by ocean waves in finite depth: unified theory and application to radiation patterns

TitleAtmospheric infrasound generation by ocean waves in finite depth: unified theory and application to radiation patterns
Publication TypeJournal Article
Year of Publication2020
AuthorsDe Carlo M., Ardhuin F., Le Pichon A
Volume221
Pagination569-585
Date Published2020/04
Type of ArticleArticle
ISBN Number0956-540X
Accession NumberWOS:000525947800040
Keywordsfluctuations; Geochemistry & Geophysics; gravity; infrasound; Interface waves; microbaroms; seismic noise; wave propagation
Abstract

Between 0.1 and 0.5 Hz, infrasound signals recorded in the atmosphere are dominated by ocean-generated noise called microbaroms. Microbaroms propagate through the atmosphere over thousands of kilometres due to low absorption and efficient ducting between the ground and the stratopause. Different theoretical models have been developed to characterize the source of microbaroms, all based on the second-order nonlinear interaction of ocean waves. While early theories considered an infinite ocean depth and a source radiation depending on the acoustic wave elevation angle, other works have approximated the radiation pattern as a monopole, and found a considerable effect of the water depth. This paper reviews these models and extends the previous theories to the combined effects of both finite depth ocean and source directivity in both elevation and azimuth angles. It is found that the water depth has a negligible effect for the near-horizontally propagating acoustic waves that should dominate the measured microbarom records. Another important result is that the microbarom azimuthal variation can be highly directive locally, but it generally becomes isotropic when integrated over a realistic source region.

DOI10.1093/gji/ggaa015
Student Publication: 
No