Infrasound from ocean waves observed in Tahiti

[1] The dominant source of infrasonic waves detected in Tahiti is associated with ocean swells generating permanent signals from 0.1 to several hertz. At thousands of kilometers from Tahiti, microbaroms are mainly produced by standing ocean waves near low-pressure systems in the south Pacific. Their monitoring over one year exhibits clear seasonal trends correlated with changes in the prevailing stratospheric wind direction. More locally, ocean waves propagating towards Tahiti also generate surf noise when impacting against the reefs. Analyzing the infrasonic recordings, the main source regions of surf signals are identified and their locations and seasonal variations are discussed.

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