Imprint of Southern Ocean mesoscale eddies on chlorophyll
Although mesoscale ocean eddies are ubiquitous in the Southern Ocean, their average regional and seasonal association with phytoplankton has not been quantified systematically yet. To this end, we identify over 100 000 mesoscale eddies with diameters of 50 km and more in the Southern Ocean and deter...
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Copernicus Publications
2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00005104 2023-05-15T13:34:49+02:00 Imprint of Southern Ocean mesoscale eddies on chlorophyll Frenger, Ivy Münnich, Matthias Gruber, Nicolas 2018-08 electronic https://doi.org/10.5194/bg-15-4781-2018 https://noa.gwlb.de/receive/cop_mods_00005104 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005061/bg-15-4781-2018.pdf https://bg.copernicus.org/articles/15/4781/2018/bg-15-4781-2018.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-15-4781-2018 https://noa.gwlb.de/receive/cop_mods_00005104 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005061/bg-15-4781-2018.pdf https://bg.copernicus.org/articles/15/4781/2018/bg-15-4781-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/bg-15-4781-2018 2022-02-08T22:59:45Z Although mesoscale ocean eddies are ubiquitous in the Southern Ocean, their average regional and seasonal association with phytoplankton has not been quantified systematically yet. To this end, we identify over 100 000 mesoscale eddies with diameters of 50 km and more in the Southern Ocean and determine the associated phytoplankton biomass anomalies using satellite-based chlorophyll-a (Chl) as a proxy. The mean Chl anomalies, δChl, associated with these eddies, comprising the upper echelon of the oceanic mesoscale, exceed ±10 % over wide regions. The structure of these anomalies is largely zonal, with cyclonic, thermocline lifted, eddies having positive anomalies in the subtropical waters north of the Antarctic Circumpolar Current (ACC) and negative anomalies along its main flow path. The pattern is similar, but reversed for anticyclonic, thermocline deepened eddies. The seasonality of δChl is weak in subtropical waters, but pronounced along the ACC, featuring a seasonal sign switch. The spatial structure and seasonality of the mesoscale δChl can be explained largely by lateral advection, especially local eddy-stirring. A prominent exception is the ACC region in winter, where δChl is consistent with a modulation of phytoplankton light exposure caused by an eddy-induced modification of the mixed layer depth. The clear impact of mesoscale eddies on phytoplankton may implicate a downstream effect on Southern Ocean biogeochemical properties, such as mode water nutrient contents. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Niedersächsisches Online-Archiv NOA Antarctic Southern Ocean The Antarctic Biogeosciences 15 15 4781 4798 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Frenger, Ivy Münnich, Matthias Gruber, Nicolas Imprint of Southern Ocean mesoscale eddies on chlorophyll |
topic_facet |
article Verlagsveröffentlichung |
description |
Although mesoscale ocean eddies are ubiquitous in the Southern Ocean, their average regional and seasonal association with phytoplankton has not been quantified systematically yet. To this end, we identify over 100 000 mesoscale eddies with diameters of 50 km and more in the Southern Ocean and determine the associated phytoplankton biomass anomalies using satellite-based chlorophyll-a (Chl) as a proxy. The mean Chl anomalies, δChl, associated with these eddies, comprising the upper echelon of the oceanic mesoscale, exceed ±10 % over wide regions. The structure of these anomalies is largely zonal, with cyclonic, thermocline lifted, eddies having positive anomalies in the subtropical waters north of the Antarctic Circumpolar Current (ACC) and negative anomalies along its main flow path. The pattern is similar, but reversed for anticyclonic, thermocline deepened eddies. The seasonality of δChl is weak in subtropical waters, but pronounced along the ACC, featuring a seasonal sign switch. The spatial structure and seasonality of the mesoscale δChl can be explained largely by lateral advection, especially local eddy-stirring. A prominent exception is the ACC region in winter, where δChl is consistent with a modulation of phytoplankton light exposure caused by an eddy-induced modification of the mixed layer depth. The clear impact of mesoscale eddies on phytoplankton may implicate a downstream effect on Southern Ocean biogeochemical properties, such as mode water nutrient contents. |
format |
Article in Journal/Newspaper |
author |
Frenger, Ivy Münnich, Matthias Gruber, Nicolas |
author_facet |
Frenger, Ivy Münnich, Matthias Gruber, Nicolas |
author_sort |
Frenger, Ivy |
title |
Imprint of Southern Ocean mesoscale eddies on chlorophyll |
title_short |
Imprint of Southern Ocean mesoscale eddies on chlorophyll |
title_full |
Imprint of Southern Ocean mesoscale eddies on chlorophyll |
title_fullStr |
Imprint of Southern Ocean mesoscale eddies on chlorophyll |
title_full_unstemmed |
Imprint of Southern Ocean mesoscale eddies on chlorophyll |
title_sort |
imprint of southern ocean mesoscale eddies on chlorophyll |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-4781-2018 https://noa.gwlb.de/receive/cop_mods_00005104 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005061/bg-15-4781-2018.pdf https://bg.copernicus.org/articles/15/4781/2018/bg-15-4781-2018.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-15-4781-2018 https://noa.gwlb.de/receive/cop_mods_00005104 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00005061/bg-15-4781-2018.pdf https://bg.copernicus.org/articles/15/4781/2018/bg-15-4781-2018.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/bg-15-4781-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
15 |
container_start_page |
4781 |
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4798 |
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