Environmental Sciences Department Seminar

"Observation of the Young-Bedard Effect during the 2010 and 2011 Atlantic Hurricane Seasons"

Presented by Philip Blom, University of Mississippi

Wednesday, October 10, 2012, 11:00 am — Bldg 815E

Infrasonic acoustic energy is known to be generated during the collision of counter propagating ocean surface waves of like periods. The acoustic signals produced by such collisions are known as microbaroms. One significant source of microbarom radiation is the interaction of waves produced by large maritime storms with the background ocean swell. The region in which the microbaroms associated with a large storm are produced tends to be hundreds of kilometers from the eye of the storm. It was suggested by Young and Bedard that, when observed along propagation paths that pass through the storm, the microbarom signal can be severely refracted by the storm itself. Such refraction has been observed in data from the 2010 and 2011 Atlantic hurricane seasons. A data processing algorithm has been developed and implemented using the Capon minimum variance beamforming method. The results of this analysis will be presented and compared with predictions of the refraction using a geometric acoustics propagation model.

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