Low-frequency ocean acoustics – Measurements from the Lofoten-VesterÅlen ocean observatory, Norway

Shaula Garibbo; Philippe Blondel; Gary Heald; Ross Heyburn; Alan J. Hunter; Duncan Williams

doi:10.1121/2.0001324

Low-frequency ocean acoustics – Measurements from the Lofoten-VesterÅlen ocean observatory, Norway

Shaula Garibbo, Philippe Blondel, Gary Heald, Ross Heyburn, Alan J. Hunter, Duncan Williams

Research output: Contribution to journal › Conference article › peer-review

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Abstract

This paper will focus on acoustic measurements from the Vesterålen cabled ocean observatory, located 15 km offshore northern Norway, at a depth of 255 m. The measurements were made with a calibrated Ocean Sonic hydrophone SB35-ETH, recording since 2013. The hydrophone node is located in a large
(ca. 15 km) canyon, not far from shipping lanes. We have measured acoustic variability up to the third-octave band centered on 125 Hz, the second shipping band identified in the European Marine Strategic Framework Directive (MSFD). Time scales from months (spanning several seasons across 2018) to hours have been investigated, considering broadband Source Pressure Levels (SPL, between 1-125 Hz), SPLs over 1-Hz frequency bands (to identify variability within third-octave bands and associate them with potential sources), and percentile contributions over the different frequency bands. Sounds from shipping and fin whale vocalisations are important contributors. Early analyses show it is also possible to detect sounds from far-away earthquakes apparently propagating in the water column (e.g. an m_b = 4.9 event in the Jan Mayen Fracture Zone, 830 km away), and other noise sources over ranges of up to 2212 km.

Original language	English
Article number	040001
Pages (from-to)	1-12
Number of pages	12
Journal	Proceedings of Meetings on Acoustics
Volume	40
Early online date	30 Nov 2020
DOIs	https://doi.org/10.1121/2.0001324
Publication status	Published - 30 Nov 2020
Event	2020 International Conference on Underwater Acoustics, ICUA 2020 - Virtual, Online Duration: 9 Sept 2020 → …

Bibliographical note

Funding Information:
This research is supported by the UK Engineering and Physical Sciences Research Council (EP-SRC), as part of industrial Cooperative Award in Science and Technology (iCASE) project #2279119, supported by Defence Science & Technology Laboratory (Dstl) and AWE Blacknest.

Keywords

underwater acoustics
ambient noise
ocean processes
shipping noise
earthquakes
fin whales

ASJC Scopus subject areas

Acoustics and Ultrasonics
Ocean Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1121/2.0001324

Garibbo_etal_POMA2020_040001_1.PDF
This is the author accepted manuscript of an article published as Garibbo, S, Blondel, P, Heald, G, Heyburn, R, Hunter, AJ & Williams, D 2020, 'Low-frequency ocean acoustics - measurements from the Lofoten-Vesterålen Ocean Observatory, Norway', Proceedings of Meetings on Acoustics, vol. 40, 040001 and available online via: https://doi.org/10.1121/2.0001324
Final published version, 6.15 MBLicence: CC BY-ND

Cite this

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abstract = "This paper will focus on acoustic measurements from the Vester{\aa}len cabled ocean observatory, located 15 km offshore northern Norway, at a depth of 255 m. The measurements were made with a calibrated Ocean Sonic hydrophone SB35-ETH, recording since 2013. The hydrophone node is located in a large(ca. 15 km) canyon, not far from shipping lanes. We have measured acoustic variability up to the third-octave band centered on 125 Hz, the second shipping band identified in the European Marine Strategic Framework Directive (MSFD). Time scales from months (spanning several seasons across 2018) to hours have been investigated, considering broadband Source Pressure Levels (SPL, between 1-125 Hz), SPLs over 1-Hz frequency bands (to identify variability within third-octave bands and associate them with potential sources), and percentile contributions over the different frequency bands. Sounds from shipping and fin whale vocalisations are important contributors. Early analyses show it is also possible to detect sounds from far-away earthquakes apparently propagating in the water column (e.g. an m_b = 4.9 event in the Jan Mayen Fracture Zone, 830 km away), and other noise sources over ranges of up to 2212 km.",

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Low-frequency ocean acoustics – Measurements from the Lofoten-VesterÅlen ocean observatory, Norway

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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