CHARACTERIZING AND MODELLING OCEAN AMBIENT NOISE USING INFRASOUND NETWORK AND MIDDLE ATMOSPHERIC MODELS
https://doi.org/10.52676/1729-7885-2018-2-144-151
Abstract
Infrasound is one of the technologies of the International Monitoring System (IMS) supporting the verification regime of the Comprehensive Nuclear-Test-Ban Treaty (CTBT). In the frequency band of interest to detect atmospheric explosions, ambient noise may affect detection and particularly ocean noise referred to as microbaroms. Ocean wave interactions generate acoustic noise almost continuously which can obscure signals of interest in their frequency range. The detectability of such noise strongly depends on atmospheric conditions along the propagation paths. Using ocean wave action model developed by IFREMER and considering the effects of general middle-atmospheric products delivered by ECMWF in long-range propagation, microbarom amplitudes and direction of arrivals derived from various propagation models are compared with the observations. With this study, it is expected to enhance the characterization of the ocean-atmosphere coupling. In return, a better knowledge of microbarom sources would allow to better characterize explosive atmospheric events hidden in the ambient noise.
About the Authors
M. De Carlo
The Atomic Energy Commission (CEA/DAM/DIF);
University of Western Brittany (UBO)
France
France
Arpajon;
Brest
A. Le Pichon
The Atomic Energy Commission (CEA/DAM/DIF)
France
Arpajon
France
Arpajon
F. Ardhuin
French Research Institute for the Exploitation of the Sea (IFREMER, LPO/CNRS)
France
France
S. P. Näsholm
NORSAR
Norway
Kjeller
Norway
Kjeller
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Review
For citations:
De Carlo M., Le Pichon A., Ardhuin F., Näsholm S.P. CHARACTERIZING AND MODELLING OCEAN AMBIENT NOISE USING INFRASOUND NETWORK AND MIDDLE ATMOSPHERIC MODELS. NNC RK Bulletin. 2018;(2):144-151. https://doi.org/10.52676/1729-7885-2018-2-144-151
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