Infrasonic ambient noise interferometry from correlations of microbaroms

We show that microbaroms, continuous infrasound fluctuations resulting from the interaction of the ocean with the atmosphere, have long‐range correlation properties that make it possible to estimate the impulse response between two microphones from passive recordings. The processing is analogous to...

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Bibliographic Details
Published in:Geophysical research letters 2009-10, Vol.36 (19), p.np-n/a
Main Author: Haney, M. M.
Format: Article
Language:English
Subjects:
ambient noise
Atmosphere
Atmospheres
Atmospheric boundary layer
Atmospheric sciences
Boundary layers
Correlation
Earth
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geophysics
Infrasonics
infrasound
Interferometry
Marine
microbaroms
Microphones
Noise
Ocean-atmosphere interaction
Oceans
Scientific apparatus & instruments
Seismology
Temperature inversions
Volcanoes
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Description
Summary:We show that microbaroms, continuous infrasound fluctuations resulting from the interaction of the ocean with the atmosphere, have long‐range correlation properties that make it possible to estimate the impulse response between two microphones from passive recordings. The processing is analogous to methods employed in the emerging field of ambient noise seismology, where the random noise source is the ocean coupling with the solid Earth (microseisms) instead of the atmosphere (microbaroms). We find that time‐dependent temperature fields and temperature inversions determine the character of infrasonic impulse responses at Fourpeaked Volcano in Alaska. Applications include imaging and monitoring the gross structure of the Earth's atmospheric boundary layer.
ISSN:0094-8276
1944-8007
DOI:10.1029/2009GL040179