title: On the coherent components of low-frequency ambient noise in the Indian Ocean.
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.
authors.affiliation: School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, USA. karim.sabra@me.gatech.edu
authors.forename: Karim G
authors.initials: KG
authors.lastname: Sabra
authors.forename: Stephanie
authors.initials: S
authors.lastname: Fried
authors.forename: W A
authors.initials: WA
authors.lastname: Kuperman
authors.forename: Mark
authors.initials: M
authors.lastname: Prior
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D004867:Equipment Design; D019156:Indian Ocean; D008962:Models, Theoretical; D009038:Motion; D009622:Noise; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography; D062125:Thermometry; D013997:Time Factors; D014159:Transducers; D014867:Water
chemical_list: D014867:Water