Eddies as trigger for diatom productivity in the open-ocean Northeast Atlantic
Anticyclonic mesoscale eddies (ACME) have been proposed as a mechanism by which new nutrients are episodically delivered into the euphotic zone, thereby enhancing new production as well as shifting phytoplankton community structure. In this paper, we report on a 34-month sediment trap experiment at...
Published in: | Progress in Oceanography |
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Online Access: | https://oceanrep.geomar.de/id/eprint/33653/ https://oceanrep.geomar.de/id/eprint/33653/1/1-s2.0-S0079661116300180-main.pdf https://doi.org/10.1016/j.pocean.2016.07.011 |
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ftoceanrep:oai:oceanrep.geomar.de:33653 2023-05-15T17:41:43+02:00 Eddies as trigger for diatom productivity in the open-ocean Northeast Atlantic Romero, Oscar E. Fischer, Gerhard Karstensen, Johannes Cermeño, Pedro 2016-09 text https://oceanrep.geomar.de/id/eprint/33653/ https://oceanrep.geomar.de/id/eprint/33653/1/1-s2.0-S0079661116300180-main.pdf https://doi.org/10.1016/j.pocean.2016.07.011 en eng Elsevier https://oceanrep.geomar.de/id/eprint/33653/1/1-s2.0-S0079661116300180-main.pdf Romero, O. E., Fischer, G., Karstensen, J. and Cermeño, P. (2016) Eddies as trigger for diatom productivity in the open-ocean Northeast Atlantic. Progress in Oceanography, 147 . pp. 38-48. DOI 10.1016/j.pocean.2016.07.011 <https://doi.org/10.1016/j.pocean.2016.07.011>. doi:10.1016/j.pocean.2016.07.011 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2016 ftoceanrep https://doi.org/10.1016/j.pocean.2016.07.011 2023-04-07T15:27:11Z Anticyclonic mesoscale eddies (ACME) have been proposed as a mechanism by which new nutrients are episodically delivered into the euphotic zone, thereby enhancing new production as well as shifting phytoplankton community structure. In this paper, we report on a 34-month sediment trap experiment at the Cape Verde Ocean Observatory (CVOO; ca. 18°N, 24°E; December 2009–October 2012), occasionally influenced by ACME passages. The typically oligotrophic, weakly seasonal particle flux pattern at the CVOO is strongly modified by the appearance of a highly productive and low oxygen ACME. Out of four recorded diatom flux maxima at CVOO, three were associated with the passage of ACMEs. The recorded diatom maxima events support the view that local ACME dynamics promotes upward nutrient supply into the euphotic zone leading to a rapid response of diatoms. This response is clearly reflected by the flux seasonality: between 40% and 60% of the total annual diatom flux at the CVOO site was intercepted in a relatively short time interval (<60 days). A highly diverse diatom community characterized the diatom fluxes throughout. Along with the ACME passages, small species of the genus Nitzschia, and Thalassionema nitzschioides var. parva dominated and delivered a major portion of the opal and organic carbon into deeper waters at site CVOO. Several pelagic, warm-water background species became dominant during intervals with low nutrient availability in the euphotic zone. Results of our interannual time-series suggest that ACMEs impact on total diatom production and the species-specific composition of the assemblage north of the Cave Verde Islands, and can strengthen the biological pump in open-ocean, oligotrophic subtropical regions of the world ocean. Our observations are useful for testing biogeochemical ocean models and will also help in improving the knowledge of processes and mechanisms behind interannual time-series of bulk components and microorganisms in pelagic and hemipelagic ocean areas Article in Journal/Newspaper Northeast Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Progress in Oceanography 147 38 48 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Anticyclonic mesoscale eddies (ACME) have been proposed as a mechanism by which new nutrients are episodically delivered into the euphotic zone, thereby enhancing new production as well as shifting phytoplankton community structure. In this paper, we report on a 34-month sediment trap experiment at the Cape Verde Ocean Observatory (CVOO; ca. 18°N, 24°E; December 2009–October 2012), occasionally influenced by ACME passages. The typically oligotrophic, weakly seasonal particle flux pattern at the CVOO is strongly modified by the appearance of a highly productive and low oxygen ACME. Out of four recorded diatom flux maxima at CVOO, three were associated with the passage of ACMEs. The recorded diatom maxima events support the view that local ACME dynamics promotes upward nutrient supply into the euphotic zone leading to a rapid response of diatoms. This response is clearly reflected by the flux seasonality: between 40% and 60% of the total annual diatom flux at the CVOO site was intercepted in a relatively short time interval (<60 days). A highly diverse diatom community characterized the diatom fluxes throughout. Along with the ACME passages, small species of the genus Nitzschia, and Thalassionema nitzschioides var. parva dominated and delivered a major portion of the opal and organic carbon into deeper waters at site CVOO. Several pelagic, warm-water background species became dominant during intervals with low nutrient availability in the euphotic zone. Results of our interannual time-series suggest that ACMEs impact on total diatom production and the species-specific composition of the assemblage north of the Cave Verde Islands, and can strengthen the biological pump in open-ocean, oligotrophic subtropical regions of the world ocean. Our observations are useful for testing biogeochemical ocean models and will also help in improving the knowledge of processes and mechanisms behind interannual time-series of bulk components and microorganisms in pelagic and hemipelagic ocean areas |
format |
Article in Journal/Newspaper |
author |
Romero, Oscar E. Fischer, Gerhard Karstensen, Johannes Cermeño, Pedro |
spellingShingle |
Romero, Oscar E. Fischer, Gerhard Karstensen, Johannes Cermeño, Pedro Eddies as trigger for diatom productivity in the open-ocean Northeast Atlantic |
author_facet |
Romero, Oscar E. Fischer, Gerhard Karstensen, Johannes Cermeño, Pedro |
author_sort |
Romero, Oscar E. |
title |
Eddies as trigger for diatom productivity in the open-ocean Northeast Atlantic |
title_short |
Eddies as trigger for diatom productivity in the open-ocean Northeast Atlantic |
title_full |
Eddies as trigger for diatom productivity in the open-ocean Northeast Atlantic |
title_fullStr |
Eddies as trigger for diatom productivity in the open-ocean Northeast Atlantic |
title_full_unstemmed |
Eddies as trigger for diatom productivity in the open-ocean Northeast Atlantic |
title_sort |
eddies as trigger for diatom productivity in the open-ocean northeast atlantic |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://oceanrep.geomar.de/id/eprint/33653/ https://oceanrep.geomar.de/id/eprint/33653/1/1-s2.0-S0079661116300180-main.pdf https://doi.org/10.1016/j.pocean.2016.07.011 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/33653/1/1-s2.0-S0079661116300180-main.pdf Romero, O. E., Fischer, G., Karstensen, J. and Cermeño, P. (2016) Eddies as trigger for diatom productivity in the open-ocean Northeast Atlantic. Progress in Oceanography, 147 . pp. 38-48. DOI 10.1016/j.pocean.2016.07.011 <https://doi.org/10.1016/j.pocean.2016.07.011>. doi:10.1016/j.pocean.2016.07.011 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.pocean.2016.07.011 |
container_title |
Progress in Oceanography |
container_volume |
147 |
container_start_page |
38 |
op_container_end_page |
48 |
_version_ |
1766143419745304576 |