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...

Full description

Bibliographic Details
Published in:Ocean Science
Main Authors: van Haren, Hans, Brussaard, Corina P. D., Gerringa, Loes J. A., van Manen, Mathijs H., Middag, Rob, Groenewegen, Ruud
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2021
Subjects:
Online Access: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
id ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00055627
record_format openpolar
spelling 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
institution Open Polar
collection Niedersächsisches Online-Archiv NOA
op_collection_id ftnonlinearchiv
language English
topic article
Verlagsveröffentlichung
spellingShingle 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