Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders

A series of observations, using a dual-frequency calibrated echosounder operating at 38 and 120 kHz, of a patch of Euphausia superba close to South Georgia in 1986 is described. Sea state is shown to cause significant noise close to the surface, but to cause no significant signal attenuation. There...

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Published in:Marine Biology
Main Authors: Everson, I., Goss, C., Murray, W.A.
Format: Article in Journal/Newspaper
Language:unknown
Published: Springer 1993
Subjects:
Euphausia superba
Online Access:http://nora.nerc.ac.uk/id/eprint/517710/
https://doi.org/10.1007/BF00350017
id ftnerc:oai:nora.nerc.ac.uk:517710
record_format openpolar
spelling ftnerc:oai:nora.nerc.ac.uk:517710 2023-05-15T16:08:26+02:00 Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders Everson, I. Goss, C. Murray, W.A. 1993 http://nora.nerc.ac.uk/id/eprint/517710/ https://doi.org/10.1007/BF00350017 unknown Springer Everson, I.; Goss, C.; Murray, W.A. 1993 Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders. Marine Biology, 116 (2). 269-275. https://doi.org/10.1007/BF00350017 <https://doi.org/10.1007/BF00350017> Publication - Article PeerReviewed 1993 ftnerc https://doi.org/10.1007/BF00350017 2023-02-04T19:45:17Z A series of observations, using a dual-frequency calibrated echosounder operating at 38 and 120 kHz, of a patch of Euphausia superba close to South Georgia in 1986 is described. Sea state is shown to cause significant noise close to the surface, but to cause no significant signal attenuation. There is a consistent difference of ∼5 dB between the signal levels at the two frequencies which is in line with the difference noted from independent observations, theoretical models and in studies on encaged aggregations of krill. Article in Journal/Newspaper Euphausia superba Natural Environment Research Council: NERC Open Research Archive Marine Biology 116 2 269 275
institution Open Polar
collection Natural Environment Research Council: NERC Open Research Archive
op_collection_id ftnerc
language unknown
description A series of observations, using a dual-frequency calibrated echosounder operating at 38 and 120 kHz, of a patch of Euphausia superba close to South Georgia in 1986 is described. Sea state is shown to cause significant noise close to the surface, but to cause no significant signal attenuation. There is a consistent difference of ∼5 dB between the signal levels at the two frequencies which is in line with the difference noted from independent observations, theoretical models and in studies on encaged aggregations of krill.
format Article in Journal/Newspaper
author Everson, I.
Goss, C.
Murray, W.A.
spellingShingle Everson, I.
Goss, C.
Murray, W.A.
Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders
author_facet Everson, I.
Goss, C.
Murray, W.A.
author_sort Everson, I.
title Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders
title_short Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders
title_full Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders
title_fullStr Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders
title_full_unstemmed Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders
title_sort comparison of krill (euphausia superba) density estimates using 38 and 120 khz echosounders
publisher Springer
publishDate 1993
url http://nora.nerc.ac.uk/id/eprint/517710/
https://doi.org/10.1007/BF00350017
genre Euphausia superba
genre_facet Euphausia superba
op_relation Everson, I.; Goss, C.; Murray, W.A. 1993 Comparison of krill (Euphausia superba) density estimates using 38 and 120 kHz echosounders. Marine Biology, 116 (2). 269-275. https://doi.org/10.1007/BF00350017 <https://doi.org/10.1007/BF00350017>
op_doi https://doi.org/10.1007/BF00350017
container_title Marine Biology
container_volume 116
container_issue 2
container_start_page 269
op_container_end_page 275
_version_ 1766404492010455040

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