under discussion
Created: April 2, 2024
Proposer: John Horne, Mark Yamane, Rob Cermak
Proposed Date: 2024-03-18
Change Date: April 2, 2024, 11:16 a.m.
Term: acoustic_index_of_aggregation_in_sea_water
Unit: m-1
Unit ref: UPRM
Acoustic index of aggregation is the depth integral of squared volume backscattering coefficient divided by the squared area backscattering coefficient. Volume backscattering coefficient is the linear form of acoustic_volume_backscattering_strength_in_sea_water. Area backscattering coefficient is the integral of the volume backscattering coefficient over a defined distance. The parameter is computed to provide a value that represents the patchiness of biomass in the water column in the field of fisheries acoustics - the value is high when small areas are much denser than the rest of the distribution. The parameter is also the reciprocal of acoustic_equivalent_area_in_sea_water. For further details see Urmy et. al (2012) doi:10.1093/icesjms/fsr205 and Woillez et. al (2007)