Infrasonic ambient noise interferometry from correlationsof microbaroms

摘要

We show that microbaroms, continuous infrasoundfluctuations resulting from the interaction of the ocean withthe atmosphere, have long-range correlation properties thatmake it possible to estimate the impulse response betweentwo microphones from passive recordings. The processingis analogous to methods employed in the emerging field ofambient noise seismology, where the random noise source isthe ocean coupling with the solid Earth (microseisms)instead of the atmosphere (microbaroms). We find that time-dependent temperature fields and temperature inversionsdetermine the character of infrasonic impulse responses atFourpeaked Volcano in Alaska. Applications includeimaging and monitoring the gross structure of the Earth'satmospheric boundary layer. Citation: Haney, M. M. (2009),Infrasonic ambient noise interferometry from correlations ofmicrobaroms.