Diapycnal mixing across the photic zone of the NE Atlantic
Variable physical conditions such as vertical turbulent exchange, internal wave, and mesoscale eddy action affect the availability of light and nutrients for phytoplankton (unicellular algae) growth. It is hypothesized that changes in ocean temperature may affect ocean vertical density stratificatio...
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Copernicus Publications
2021
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00055627 2024-09-15T18:25:26+00:00 Diapycnal mixing across the photic zone of the NE Atlantic van Haren, Hans Brussaard, Corina P. D. Gerringa, Loes J. A. van Manen, Mathijs H. Middag, Rob Groenewegen, Ruud 2021-02 electronic https://doi.org/10.5194/os-17-301-2021 https://noa.gwlb.de/receive/cop_mods_00055627 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055278/os-17-301-2021.pdf https://os.copernicus.org/articles/17/301/2021/os-17-301-2021.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-17-301-2021 https://noa.gwlb.de/receive/cop_mods_00055627 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055278/os-17-301-2021.pdf https://os.copernicus.org/articles/17/301/2021/os-17-301-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/os-17-301-2021 2024-06-26T04:41:37Z Variable physical conditions such as vertical turbulent exchange, internal wave, and mesoscale eddy action affect the availability of light and nutrients for phytoplankton (unicellular algae) growth. It is hypothesized that changes in ocean temperature may affect ocean vertical density stratification, which may hamper vertical exchange. In order to quantify variations in physical conditions in the northeast Atlantic Ocean, we sampled a latitudinal transect along 17 ± 5∘ W between 30 and 63∘ N in summer. A shipborne conductivity–temperature–depth (CTD) instrumented package was used with a custom-made modification of the pump inlet to minimize detrimental effects of ship motions on its data. Thorpe-scale analysis was used to establish turbulence values for the upper 500 m from three to six profiles obtained in a short CTD yo-yo, 3 to 5 h after local sunrise. From south to north, average temperature decreased together with stratification while turbulence values weakly increased or remained constant. Vertical turbulent nutrient fluxes did not vary significantly with stratification and latitude. This apparent lack of correspondence between turbulent mixing and temperature is likely due to internal waves breaking (increased stratification can support more internal waves), acting as a potential feedback mechanism. As this feedback mechanism mediates potential physical environment changes in temperature, global surface ocean warming may not affect the vertical nutrient fluxes to a large degree. We urge modellers to test this deduction as it could imply that the future summer phytoplankton productivity in stratified oligotrophic waters would experience little alterations in nutrient input from deeper waters. Article in Journal/Newspaper Northeast Atlantic Niedersächsisches Online-Archiv NOA Ocean Science 17 1 301 318 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung van Haren, Hans Brussaard, Corina P. D. Gerringa, Loes J. A. van Manen, Mathijs H. Middag, Rob Groenewegen, Ruud Diapycnal mixing across the photic zone of the NE Atlantic |
topic_facet |
article Verlagsveröffentlichung |
description |
Variable physical conditions such as vertical turbulent exchange, internal wave, and mesoscale eddy action affect the availability of light and nutrients for phytoplankton (unicellular algae) growth. It is hypothesized that changes in ocean temperature may affect ocean vertical density stratification, which may hamper vertical exchange. In order to quantify variations in physical conditions in the northeast Atlantic Ocean, we sampled a latitudinal transect along 17 ± 5∘ W between 30 and 63∘ N in summer. A shipborne conductivity–temperature–depth (CTD) instrumented package was used with a custom-made modification of the pump inlet to minimize detrimental effects of ship motions on its data. Thorpe-scale analysis was used to establish turbulence values for the upper 500 m from three to six profiles obtained in a short CTD yo-yo, 3 to 5 h after local sunrise. From south to north, average temperature decreased together with stratification while turbulence values weakly increased or remained constant. Vertical turbulent nutrient fluxes did not vary significantly with stratification and latitude. This apparent lack of correspondence between turbulent mixing and temperature is likely due to internal waves breaking (increased stratification can support more internal waves), acting as a potential feedback mechanism. As this feedback mechanism mediates potential physical environment changes in temperature, global surface ocean warming may not affect the vertical nutrient fluxes to a large degree. We urge modellers to test this deduction as it could imply that the future summer phytoplankton productivity in stratified oligotrophic waters would experience little alterations in nutrient input from deeper waters. |
format |
Article in Journal/Newspaper |
author |
van Haren, Hans Brussaard, Corina P. D. Gerringa, Loes J. A. van Manen, Mathijs H. Middag, Rob Groenewegen, Ruud |
author_facet |
van Haren, Hans Brussaard, Corina P. D. Gerringa, Loes J. A. van Manen, Mathijs H. Middag, Rob Groenewegen, Ruud |
author_sort |
van Haren, Hans |
title |
Diapycnal mixing across the photic zone of the NE Atlantic |
title_short |
Diapycnal mixing across the photic zone of the NE Atlantic |
title_full |
Diapycnal mixing across the photic zone of the NE Atlantic |
title_fullStr |
Diapycnal mixing across the photic zone of the NE Atlantic |
title_full_unstemmed |
Diapycnal mixing across the photic zone of the NE Atlantic |
title_sort |
diapycnal mixing across the photic zone of the ne atlantic |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/os-17-301-2021 https://noa.gwlb.de/receive/cop_mods_00055627 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055278/os-17-301-2021.pdf https://os.copernicus.org/articles/17/301/2021/os-17-301-2021.pdf |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
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-17-301-2021 https://noa.gwlb.de/receive/cop_mods_00055627 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00055278/os-17-301-2021.pdf https://os.copernicus.org/articles/17/301/2021/os-17-301-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/os-17-301-2021 |
container_title |
Ocean Science |
container_volume |
17 |
container_issue |
1 |
container_start_page |
301 |
op_container_end_page |
318 |
_version_ |
1810465952594132992 |