Atmospheric Infrasound from Hurricanes Felicia and Neki of 2009
Abstract
Microbaroms are infrasound signals with a dominant frequency at 0.2 Hz. Monitoring stations around the globe continuously detected strong microbaroms across the ocean. Hurricanes Felicia and Neki were well recorded in 2009 at the International Monitoring System's IS59 array located in Kailua-Kona. A theoretical acoustic source model is utilized to estimate the intensity and spatial distribution of microbaroms produced by surface waves in the open ocean. The tropical cyclone sea state is created by utilizing a spectral ocean wave model and blended wind fields of different spatial scales that include the global winds from NCEP's final analysis, regional winds from University of Hawaii Meteorology Department's Weather and Forecasting model, and high resolution tropical cyclone winds from a parametric hurricane model. The computed wave data is validated with altimetry measurements. The strong correlation between the microbarom estimates and the IS59 measurements supports the potential use of infrasound signals for warning of hazardous wave conditions.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFM.A31A0041S
- Keywords:
-
- 2427 IONOSPHERE / Ionosphere/atmosphere interactions;
- 3339 ATMOSPHERIC PROCESSES / Ocean/atmosphere interactions;
- 4560 OCEANOGRAPHY: PHYSICAL / Surface waves and tides