On the coherent components of low-frequency ambient noise in the Indian Ocean

TitleOn the coherent components of low-frequency ambient noise in the Indian Ocean
Publication TypeJournal Article
Year of Publication2013
AuthorsSabra KG, Fried S, Kuperman WA, Prior M
JournalJournal of the Acoustical Society of America
Volume133
PaginationEL20-EL25
Date Published2013/01
Type of ArticleArticle
ISBN Number0001-4966
Accession NumberWOS:000313034700004
Keywordsarray; emergence rate; greens-function; localization; wave-fronts
Abstract

This letter demonstrates that the dominant coherent component of low-frequency (1 Hz < f < 20 Hz) ambient noise propagating between hydrophone pairs of the same hydroacoustic station, deployed in the deep sound channel of the Indian Ocean, is directional and mainly originates from Antarctica. However, the amplitude of the peak coherent noise arrivals, obtained using a 4-month-long averaging interval, was relatively low given the small hydrophones spacing hydrophones (< 2 km). Hence, extracting similar coherent arrivals between two distinct hydroacoustic stations separated instead by thousands of kilometers for noise-based acoustic thermometry purposes seems unlikely, even using a year-long averaging. (C) 2013 Acoustical Society of America

DOI10.1121/1.4769401
Integrated Research Themes: 
Student Publication: 
No