Sea-ice and water dynamics and moonlight impact the acoustic backscatter diurnal signal over the eastern Beaufort Sea continental slope
A 2-year-long time series of currents and acoustic backscatter from an acoustic Doppler current profiler, moored over the eastern Beaufort Sea continental slope from October 2003 to September 2005, were used to assess the dynamics and variability of the sound-scattering layer. It has been shown that...
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Copernicus Publications
2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00054436 2023-05-15T15:40:20+02:00 Sea-ice and water dynamics and moonlight impact the acoustic backscatter diurnal signal over the eastern Beaufort Sea continental slope Dmitrenko, Igor A. Petrusevich, Vladislav Darnis, Gérald Kirillov, Sergei A. Komarov, Alexander S. Ehn, Jens K. Forest, Alexandre Fortier, Louis Rysgaard, Søren Barber, David G. 2020-10 electronic https://doi.org/10.5194/os-16-1261-2020 https://noa.gwlb.de/receive/cop_mods_00054436 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054087/os-16-1261-2020.pdf https://os.copernicus.org/articles/16/1261/2020/os-16-1261-2020.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-16-1261-2020 https://noa.gwlb.de/receive/cop_mods_00054436 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054087/os-16-1261-2020.pdf https://os.copernicus.org/articles/16/1261/2020/os-16-1261-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/os-16-1261-2020 2022-02-08T22:34:59Z A 2-year-long time series of currents and acoustic backscatter from an acoustic Doppler current profiler, moored over the eastern Beaufort Sea continental slope from October 2003 to September 2005, were used to assess the dynamics and variability of the sound-scattering layer. It has been shown that acoustic backscatter is dominated by a synchronized diel vertical migration (DVM) of zooplankton. Our results show that DVM timings (i) were synchronous with sunlight and (ii) were modified by moonlight and sea ice, which attenuates light transmission to the water column. Moreover, DVM is modified or completely disrupted during highly energetic current events. Thicker ice observed during winter–spring 2005 lowered the backscatter values but favored extending DVM toward the midnight sun. In contrast to many previous studies, DVM occurred through the intermediate water layer during the ice-free season of the midnight sun in 2004. In 2005, the midnight-sun DVM was likely impacted by a high acoustic scattering generated by suspended particles. During full moon at low cloud cover, the nighttime moonlight illuminance led to zooplankton avoidance of the subsurface layer, disrupting DVM. Moreover, DVM was disrupted by upwelling, downwelling, and eddy passing. We suggest that these deviations are consistent with DVM adjusting to avoid enhanced water dynamics. For upwelling and downwelling, zooplankton likely respond to the along-slope water dynamics dominated by surface- and depth-intensified flow, respectively. This drives zooplankton to adjust DVM by aggregating in the low or upper intermediate water layer for upwelling and downwelling, respectively. The baroclinic eddy reversed DVM below the eddy core. Article in Journal/Newspaper Beaufort Sea Sea ice midnight sun Niedersächsisches Online-Archiv NOA Ocean Science 16 5 1261 1283 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Dmitrenko, Igor A. Petrusevich, Vladislav Darnis, Gérald Kirillov, Sergei A. Komarov, Alexander S. Ehn, Jens K. Forest, Alexandre Fortier, Louis Rysgaard, Søren Barber, David G. Sea-ice and water dynamics and moonlight impact the acoustic backscatter diurnal signal over the eastern Beaufort Sea continental slope |
topic_facet |
article Verlagsveröffentlichung |
description |
A 2-year-long time series of currents and acoustic backscatter from an acoustic Doppler current profiler, moored over the eastern Beaufort Sea continental slope from October 2003 to September 2005, were used to assess the dynamics and variability of the sound-scattering layer. It has been shown that acoustic backscatter is dominated by a synchronized diel vertical migration (DVM) of zooplankton. Our results show that DVM timings (i) were synchronous with sunlight and (ii) were modified by moonlight and sea ice, which attenuates light transmission to the water column. Moreover, DVM is modified or completely disrupted during highly energetic current events. Thicker ice observed during winter–spring 2005 lowered the backscatter values but favored extending DVM toward the midnight sun. In contrast to many previous studies, DVM occurred through the intermediate water layer during the ice-free season of the midnight sun in 2004. In 2005, the midnight-sun DVM was likely impacted by a high acoustic scattering generated by suspended particles. During full moon at low cloud cover, the nighttime moonlight illuminance led to zooplankton avoidance of the subsurface layer, disrupting DVM. Moreover, DVM was disrupted by upwelling, downwelling, and eddy passing. We suggest that these deviations are consistent with DVM adjusting to avoid enhanced water dynamics. For upwelling and downwelling, zooplankton likely respond to the along-slope water dynamics dominated by surface- and depth-intensified flow, respectively. This drives zooplankton to adjust DVM by aggregating in the low or upper intermediate water layer for upwelling and downwelling, respectively. The baroclinic eddy reversed DVM below the eddy core. |
format |
Article in Journal/Newspaper |
author |
Dmitrenko, Igor A. Petrusevich, Vladislav Darnis, Gérald Kirillov, Sergei A. Komarov, Alexander S. Ehn, Jens K. Forest, Alexandre Fortier, Louis Rysgaard, Søren Barber, David G. |
author_facet |
Dmitrenko, Igor A. Petrusevich, Vladislav Darnis, Gérald Kirillov, Sergei A. Komarov, Alexander S. Ehn, Jens K. Forest, Alexandre Fortier, Louis Rysgaard, Søren Barber, David G. |
author_sort |
Dmitrenko, Igor A. |
title |
Sea-ice and water dynamics and moonlight impact the acoustic backscatter diurnal signal over the eastern Beaufort Sea continental slope |
title_short |
Sea-ice and water dynamics and moonlight impact the acoustic backscatter diurnal signal over the eastern Beaufort Sea continental slope |
title_full |
Sea-ice and water dynamics and moonlight impact the acoustic backscatter diurnal signal over the eastern Beaufort Sea continental slope |
title_fullStr |
Sea-ice and water dynamics and moonlight impact the acoustic backscatter diurnal signal over the eastern Beaufort Sea continental slope |
title_full_unstemmed |
Sea-ice and water dynamics and moonlight impact the acoustic backscatter diurnal signal over the eastern Beaufort Sea continental slope |
title_sort |
sea-ice and water dynamics and moonlight impact the acoustic backscatter diurnal signal over the eastern beaufort sea continental slope |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/os-16-1261-2020 https://noa.gwlb.de/receive/cop_mods_00054436 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054087/os-16-1261-2020.pdf https://os.copernicus.org/articles/16/1261/2020/os-16-1261-2020.pdf |
genre |
Beaufort Sea Sea ice midnight sun |
genre_facet |
Beaufort Sea Sea ice midnight sun |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-16-1261-2020 https://noa.gwlb.de/receive/cop_mods_00054436 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00054087/os-16-1261-2020.pdf https://os.copernicus.org/articles/16/1261/2020/os-16-1261-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/os-16-1261-2020 |
container_title |
Ocean Science |
container_volume |
16 |
container_issue |
5 |
container_start_page |
1261 |
op_container_end_page |
1283 |
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1766372546714796032 |