TY - GEN
T1 - Acoustic signatures of shipping, weather and marine life
T2 - 2020 International Conference on Underwater Acoustics, ICUA 2020
AU - Blondel, Ph
AU - Dell, B.
AU - Suriyaprakasam, C.
PY - 2020/10/27
Y1 - 2020/10/27
N2 - Acoustic signatures of shipping, weather and marine life are relatively well constrained, but there are strong variations with their oceanographic context and human activities. We investigate two contrasted settings, for timescales up to a year and frequencies up to 2 kHz. Arctic data from NOAA Noise Reference Station (NRS) NRS01, 500 m deep in the Arctic Chukchi Sea and away from major shipping areas is compared with measurements from Folger Deep, part of the Ocean Networks Canada network, 95 m deep and close to shipping lanes. PAMGuide is used to quantify broadband Sound Pressure Levels (SPLs), Third-Octave band Levels (TOLs), Power Spectral Densities (PSDs) and percentile contributions. The Acoustic Complexity Index (ACI) is an emerging metric to measure the apparent acoustic biodiversity, and we use its Seewave implementation. We compare the third-octave bands centred on 63 Hz and 125 Hz (“shipping” bands of the European Marine Strategy Framework Directive) in each environment and assess their use in the presence of heavy ice and little to no shipping. Metrics designed for open waters are not directly applicable to icy environments, or at least not on their own. They must be supplemented with multivariate analyses of context-specific third-octave bands.
AB - Acoustic signatures of shipping, weather and marine life are relatively well constrained, but there are strong variations with their oceanographic context and human activities. We investigate two contrasted settings, for timescales up to a year and frequencies up to 2 kHz. Arctic data from NOAA Noise Reference Station (NRS) NRS01, 500 m deep in the Arctic Chukchi Sea and away from major shipping areas is compared with measurements from Folger Deep, part of the Ocean Networks Canada network, 95 m deep and close to shipping lanes. PAMGuide is used to quantify broadband Sound Pressure Levels (SPLs), Third-Octave band Levels (TOLs), Power Spectral Densities (PSDs) and percentile contributions. The Acoustic Complexity Index (ACI) is an emerging metric to measure the apparent acoustic biodiversity, and we use its Seewave implementation. We compare the third-octave bands centred on 63 Hz and 125 Hz (“shipping” bands of the European Marine Strategy Framework Directive) in each environment and assess their use in the presence of heavy ice and little to no shipping. Metrics designed for open waters are not directly applicable to icy environments, or at least not on their own. They must be supplemented with multivariate analyses of context-specific third-octave bands.
UR - http://www.scopus.com/inward/record.url?scp=85118537469&partnerID=8YFLogxK
U2 - 10.1121/2.0001312
DO - 10.1121/2.0001312
M3 - Chapter in a published conference proceeding
AN - SCOPUS:85118537469
T3 - Proceedings of the Institute of Acoustics
BT - International Conference on Underwater Acoustics, ICUA 2020
PB - Institute of Acoustics
Y2 - 9 September 2020
ER -
