A distorted wave Born approximation target strength model for Bering Sea euphausiids
<qd> Smith, J. N., Ressler, P. H., and Warren, J. D. A distorted wave Born approximation target strength model for Bering Sea euphausiids. – ICES Journal of Marine Science, doi.10.1093/icesjms/fss140. </qd>Acoustic surveys monitor euphausiid populations in the Bering Sea because of their...
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fthighwire:oai:open-archive.highwire.org:icesjms:fss140v1 2023-05-15T15:43:13+02:00 A distorted wave Born approximation target strength model for Bering Sea euphausiids Smith, Joy N. Ressler, Patrick H. Warren, Joseph D. 2012-10-19 05:37:45.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/fss140v1 https://doi.org/10.1093/icesjms/fss140 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/fss140v1 http://dx.doi.org/10.1093/icesjms/fss140 Copyright (C) 2012, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Article TEXT 2012 fthighwire https://doi.org/10.1093/icesjms/fss140 2013-05-26T22:47:44Z <qd> Smith, J. N., Ressler, P. H., and Warren, J. D. A distorted wave Born approximation target strength model for Bering Sea euphausiids. – ICES Journal of Marine Science, doi.10.1093/icesjms/fss140. </qd>Acoustic surveys monitor euphausiid populations in the Bering Sea because of their importance as prey for walleye pollock and other organisms. Various scattering models exist to convert acoustic backscatter data to estimates of euphausiid numerical density or biomass, but a target strength (TS) model specific to Bering Sea euphausiids has not been available. This study parameterized a distorted wave Born approximation (DWBA) scattering model using physical (length and body shape) and material (density contrast, g , and sound speed contrast, h ) properties measured from live euphausiids. All model parameters (length, shape, material properties, orientation) were evaluated for their effect on predicted TS. A polynomial function was used to describe animal shape and produced smaller TS estimates compared to a taper function, as is traditionally used in DWBA scattering models of euphausiids. Animal length was positively correlated with TS, but variations in other parameters (including material properties and orientation) also produced large changes in TS. Large differences in TS between estimates calculated using measured versus literature material property values caused large variations in acoustic estimates of euphausiid numerical densities (animals m−3) which emphasizes the importance of collecting site-specific g and h measurements when possible. Text Bering Sea HighWire Press (Stanford University) Bering Sea ICES Journal of Marine Science 70 1 204 214 |
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HighWire Press (Stanford University) |
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English |
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Article Smith, Joy N. Ressler, Patrick H. Warren, Joseph D. A distorted wave Born approximation target strength model for Bering Sea euphausiids |
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description |
<qd> Smith, J. N., Ressler, P. H., and Warren, J. D. A distorted wave Born approximation target strength model for Bering Sea euphausiids. – ICES Journal of Marine Science, doi.10.1093/icesjms/fss140. </qd>Acoustic surveys monitor euphausiid populations in the Bering Sea because of their importance as prey for walleye pollock and other organisms. Various scattering models exist to convert acoustic backscatter data to estimates of euphausiid numerical density or biomass, but a target strength (TS) model specific to Bering Sea euphausiids has not been available. This study parameterized a distorted wave Born approximation (DWBA) scattering model using physical (length and body shape) and material (density contrast, g , and sound speed contrast, h ) properties measured from live euphausiids. All model parameters (length, shape, material properties, orientation) were evaluated for their effect on predicted TS. A polynomial function was used to describe animal shape and produced smaller TS estimates compared to a taper function, as is traditionally used in DWBA scattering models of euphausiids. Animal length was positively correlated with TS, but variations in other parameters (including material properties and orientation) also produced large changes in TS. Large differences in TS between estimates calculated using measured versus literature material property values caused large variations in acoustic estimates of euphausiid numerical densities (animals m−3) which emphasizes the importance of collecting site-specific g and h measurements when possible. |
format |
Text |
author |
Smith, Joy N. Ressler, Patrick H. Warren, Joseph D. |
author_facet |
Smith, Joy N. Ressler, Patrick H. Warren, Joseph D. |
author_sort |
Smith, Joy N. |
title |
A distorted wave Born approximation target strength model for Bering Sea euphausiids |
title_short |
A distorted wave Born approximation target strength model for Bering Sea euphausiids |
title_full |
A distorted wave Born approximation target strength model for Bering Sea euphausiids |
title_fullStr |
A distorted wave Born approximation target strength model for Bering Sea euphausiids |
title_full_unstemmed |
A distorted wave Born approximation target strength model for Bering Sea euphausiids |
title_sort |
distorted wave born approximation target strength model for bering sea euphausiids |
publisher |
Oxford University Press |
publishDate |
2012 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/fss140v1 https://doi.org/10.1093/icesjms/fss140 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/fss140v1 http://dx.doi.org/10.1093/icesjms/fss140 |
op_rights |
Copyright (C) 2012, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fss140 |
container_title |
ICES Journal of Marine Science |
container_volume |
70 |
container_issue |
1 |
container_start_page |
204 |
op_container_end_page |
214 |
_version_ |
1766377262456766464 |