Imprint of Southern Ocean 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 100000 mesoscale eddies with diameters of 50km and more in the Southern Ocean and determi...
Published in: | Biogeosciences |
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Language: | English |
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Copernicus Publications (EGU)
2018
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Online Access: | https://oceanrep.geomar.de/id/eprint/41936/ https://oceanrep.geomar.de/id/eprint/41936/1/bg-15-4781-2018.pdf https://oceanrep.geomar.de/id/eprint/41936/2/bg-15-4781-2018-supplement.pdf https://www.biogeosciences.net/15/4781/2018/bg-15-4781-2018.html https://doi.org/10.5194/bg-15-4781-2018 |
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ftoceanrep:oai:oceanrep.geomar.de:41936 2023-05-15T13:37:52+02:00 Imprint of Southern Ocean eddies on chlorophyll Frenger, Ivy Münnich, Matthias Gruber, Nicolas 2018-08-13 text https://oceanrep.geomar.de/id/eprint/41936/ https://oceanrep.geomar.de/id/eprint/41936/1/bg-15-4781-2018.pdf https://oceanrep.geomar.de/id/eprint/41936/2/bg-15-4781-2018-supplement.pdf https://www.biogeosciences.net/15/4781/2018/bg-15-4781-2018.html https://doi.org/10.5194/bg-15-4781-2018 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/41936/1/bg-15-4781-2018.pdf https://oceanrep.geomar.de/id/eprint/41936/2/bg-15-4781-2018-supplement.pdf Frenger, I. , Münnich, M. and Gruber, N. (2018) Imprint of Southern Ocean eddies on chlorophyll. Open Access Biogeosciences (BG), 15 . pp. 4781-4798. DOI 10.5194/bg-15-4781-2018 <https://doi.org/10.5194/bg-15-4781-2018>. doi:10.5194/bg-15-4781-2018 cc_by_3.0 info:eu-repo/semantics/openAccess Article PeerReviewed info:eu-repo/semantics/article 2018 ftoceanrep https://doi.org/10.5194/bg-15-4781-2018 2023-04-07T15:38:23Z 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 100000 mesoscale eddies with diameters of 50km 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Southern Ocean The Antarctic Biogeosciences 15 15 4781 4798 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
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 100000 mesoscale eddies with diameters of 50km 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 |
spellingShingle |
Frenger, Ivy Münnich, Matthias Gruber, Nicolas Imprint of Southern Ocean eddies on chlorophyll |
author_facet |
Frenger, Ivy Münnich, Matthias Gruber, Nicolas |
author_sort |
Frenger, Ivy |
title |
Imprint of Southern Ocean eddies on chlorophyll |
title_short |
Imprint of Southern Ocean eddies on chlorophyll |
title_full |
Imprint of Southern Ocean eddies on chlorophyll |
title_fullStr |
Imprint of Southern Ocean eddies on chlorophyll |
title_full_unstemmed |
Imprint of Southern Ocean eddies on chlorophyll |
title_sort |
imprint of southern ocean eddies on chlorophyll |
publisher |
Copernicus Publications (EGU) |
publishDate |
2018 |
url |
https://oceanrep.geomar.de/id/eprint/41936/ https://oceanrep.geomar.de/id/eprint/41936/1/bg-15-4781-2018.pdf https://oceanrep.geomar.de/id/eprint/41936/2/bg-15-4781-2018-supplement.pdf https://www.biogeosciences.net/15/4781/2018/bg-15-4781-2018.html https://doi.org/10.5194/bg-15-4781-2018 |
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 |
https://oceanrep.geomar.de/id/eprint/41936/1/bg-15-4781-2018.pdf https://oceanrep.geomar.de/id/eprint/41936/2/bg-15-4781-2018-supplement.pdf Frenger, I. , Münnich, M. and Gruber, N. (2018) Imprint of Southern Ocean eddies on chlorophyll. Open Access Biogeosciences (BG), 15 . pp. 4781-4798. DOI 10.5194/bg-15-4781-2018 <https://doi.org/10.5194/bg-15-4781-2018>. doi:10.5194/bg-15-4781-2018 |
op_rights |
cc_by_3.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-15-4781-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
15 |
container_start_page |
4781 |
op_container_end_page |
4798 |
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1766098489783091200 |