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Ambient noise source characterization using spectral, coherence, and directionality estimates at Kongsfjorden
Sanjana M C1, Latha G1, Thirunavukkarasu A1
1Ministry of Earth Sciences, National Institute of Ocean Technology, Pallikaranai, Chennai 600100, Indiasanjana@niot.res.in; latha@niot.res.in; vathiru@niot.res.in.
Arctic fjord ambient noise was analyzed using hydrophones. Seasonal variations in wind, shipping, and ice activity were identified, aiding passive acoustic monitoring for ice dynamics.
Area of Science:
- Oceanography
- Acoustics
- Arctic Studies
Background:
- Ambient noise in Arctic fjords is influenced by environmental factors.
- Understanding noise sources is crucial for monitoring Arctic ecosystems and ice dynamics.
Purpose of the Study:
- To analyze ambient noise in an Arctic fjord across seasons.
- To identify and categorize dominant noise sources.
- To assess the utility of acoustic methods for studying ice dynamics.
Main Methods:
- Collected ambient noise data using vertically separated hydrophones.
- Applied spectral, coherence, and directionality analyses.
- Categorized noise sources including wind, shipping, and ice activity.
Main Results:
- Distinct noise patterns were observed between summer and winter.
- Coherence analysis helped attribute noise to specific sources.
- Vertical directionality estimates revealed temporal and seasonal variations in noise sources.
Conclusions:
- Acoustic analysis effectively categorizes Arctic fjord noise sources.
- Source identification techniques enhance passive acoustic monitoring.
- This approach provides valuable insights into ice dynamics in glacierized fjords.
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