Vertical Migration of Pelagic and Mesopelagic Scatterers From ADCP Backscatter Data in the Southern Norwegian Sea

Records of backscatter and vertical velocity obtained from moored Acoustic Doppler Current Profilers (ADCP) enabled new insights into the dynamics of deep scattering layers (DSLs) and diel vertical migration (DVM) of mesopelagic biomass between these deep layers and the near-surface photic zone in t...

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Published in:Frontiers in Marine Science
Main Authors: Cisewski, Boris, Hátún, Hjálmar, Kristiansen, Inga, Hansen, Bogi, Larsen, Karin Margretha H., Eliasen, Sólvá Káradóttir, Jacobsen, Jan Arge
Format: Article in Journal/Newspaper
Language:unknown
Published: Frontiers Media SA 2021
Subjects:
Online Access:http://dx.doi.org/10.3389/fmars.2020.542386
https://www.frontiersin.org/articles/10.3389/fmars.2020.542386/full
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spelling crfrontiers:10.3389/fmars.2020.542386 2024-06-23T07:55:43+00:00 Vertical Migration of Pelagic and Mesopelagic Scatterers From ADCP Backscatter Data in the Southern Norwegian Sea Cisewski, Boris Hátún, Hjálmar Kristiansen, Inga Hansen, Bogi Larsen, Karin Margretha H. Eliasen, Sólvá Káradóttir Jacobsen, Jan Arge 2021 http://dx.doi.org/10.3389/fmars.2020.542386 https://www.frontiersin.org/articles/10.3389/fmars.2020.542386/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 7 ISSN 2296-7745 journal-article 2021 crfrontiers https://doi.org/10.3389/fmars.2020.542386 2024-06-11T04:06:28Z Records of backscatter and vertical velocity obtained from moored Acoustic Doppler Current Profilers (ADCP) enabled new insights into the dynamics of deep scattering layers (DSLs) and diel vertical migration (DVM) of mesopelagic biomass between these deep layers and the near-surface photic zone in the southern Norwegian Sea. The DSL exhibits characteristic vertical movement on inter-monthly time scales, which is associated with undulations of the main pycnocline between the warm Atlantic water and the underlying colder water masses. Timing of the DVM is closely linked to the day-night light cycle—decent from the photic zone just before sunrise and ascent immediately after sunset. Seasonal variations are also evident, with the highest DVM activity and lowest depth averaged mean volume backscatter strength (MVBS) during spring. This suggests that both oceanographic and optical conditions are driving the complex dynamics of pelagic and mesopelagic activity in this region. We hypothesize that the increased abundance of calanoid copepods in the near-surface layer during spring increases the motivation for vertical migration of pelagic and mesopelagic species, which therefore can explain the increased DVM activity during this season. Article in Journal/Newspaper Norwegian Sea Copepods Frontiers (Publisher) Norwegian Sea Frontiers in Marine Science 7
institution Open Polar
collection Frontiers (Publisher)
op_collection_id crfrontiers
language unknown
description Records of backscatter and vertical velocity obtained from moored Acoustic Doppler Current Profilers (ADCP) enabled new insights into the dynamics of deep scattering layers (DSLs) and diel vertical migration (DVM) of mesopelagic biomass between these deep layers and the near-surface photic zone in the southern Norwegian Sea. The DSL exhibits characteristic vertical movement on inter-monthly time scales, which is associated with undulations of the main pycnocline between the warm Atlantic water and the underlying colder water masses. Timing of the DVM is closely linked to the day-night light cycle—decent from the photic zone just before sunrise and ascent immediately after sunset. Seasonal variations are also evident, with the highest DVM activity and lowest depth averaged mean volume backscatter strength (MVBS) during spring. This suggests that both oceanographic and optical conditions are driving the complex dynamics of pelagic and mesopelagic activity in this region. We hypothesize that the increased abundance of calanoid copepods in the near-surface layer during spring increases the motivation for vertical migration of pelagic and mesopelagic species, which therefore can explain the increased DVM activity during this season.
format Article in Journal/Newspaper
author Cisewski, Boris
Hátún, Hjálmar
Kristiansen, Inga
Hansen, Bogi
Larsen, Karin Margretha H.
Eliasen, Sólvá Káradóttir
Jacobsen, Jan Arge
spellingShingle Cisewski, Boris
Hátún, Hjálmar
Kristiansen, Inga
Hansen, Bogi
Larsen, Karin Margretha H.
Eliasen, Sólvá Káradóttir
Jacobsen, Jan Arge
Vertical Migration of Pelagic and Mesopelagic Scatterers From ADCP Backscatter Data in the Southern Norwegian Sea
author_facet Cisewski, Boris
Hátún, Hjálmar
Kristiansen, Inga
Hansen, Bogi
Larsen, Karin Margretha H.
Eliasen, Sólvá Káradóttir
Jacobsen, Jan Arge
author_sort Cisewski, Boris
title Vertical Migration of Pelagic and Mesopelagic Scatterers From ADCP Backscatter Data in the Southern Norwegian Sea
title_short Vertical Migration of Pelagic and Mesopelagic Scatterers From ADCP Backscatter Data in the Southern Norwegian Sea
title_full Vertical Migration of Pelagic and Mesopelagic Scatterers From ADCP Backscatter Data in the Southern Norwegian Sea
title_fullStr Vertical Migration of Pelagic and Mesopelagic Scatterers From ADCP Backscatter Data in the Southern Norwegian Sea
title_full_unstemmed Vertical Migration of Pelagic and Mesopelagic Scatterers From ADCP Backscatter Data in the Southern Norwegian Sea
title_sort vertical migration of pelagic and mesopelagic scatterers from adcp backscatter data in the southern norwegian sea
publisher Frontiers Media SA
publishDate 2021
url http://dx.doi.org/10.3389/fmars.2020.542386
https://www.frontiersin.org/articles/10.3389/fmars.2020.542386/full
geographic Norwegian Sea
geographic_facet Norwegian Sea
genre Norwegian Sea
Copepods
genre_facet Norwegian Sea
Copepods
op_source Frontiers in Marine Science
volume 7
ISSN 2296-7745
op_rights https://creativecommons.org/licenses/by/4.0/
op_doi https://doi.org/10.3389/fmars.2020.542386
container_title Frontiers in Marine Science
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