Can eddies make ocean deserts bloom?
An eddy-resolving coupled ecosystem-circulation model of the North Atlantic is used to investigate the impact of mesoscale variability on the nitrate supply to the light-lit euphotic zone. The focus is on the oligotrophic subtropical gyre where eddies have been suggested to reconcile apparently cont...
Published in: | Global Biogeochemical Cycles |
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AGU (American Geophysical Union)
2002
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Online Access: | https://oceanrep.geomar.de/id/eprint/734/ https://oceanrep.geomar.de/id/eprint/734/1/gbc832.pdf https://doi.org/10.1029/2001GB001830 |
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ftoceanrep:oai:oceanrep.geomar.de:734 2023-05-15T17:33:08+02:00 Can eddies make ocean deserts bloom? Oschlies, Andreas 2002-12-03 text https://oceanrep.geomar.de/id/eprint/734/ https://oceanrep.geomar.de/id/eprint/734/1/gbc832.pdf https://doi.org/10.1029/2001GB001830 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/734/1/gbc832.pdf Oschlies, A. (2002) Can eddies make ocean deserts bloom?. Open Access Global Biogeochemical Cycles, 16 (4). p. 1106. DOI 10.1029/2001GB001830 <https://doi.org/10.1029/2001GB001830>. doi:10.1029/2001GB001830 info:eu-repo/semantics/openAccess Article PeerReviewed 2002 ftoceanrep https://doi.org/10.1029/2001GB001830 2023-04-07T14:42:42Z An eddy-resolving coupled ecosystem-circulation model of the North Atlantic is used to investigate the impact of mesoscale variability on the nitrate supply to the light-lit euphotic zone. The focus is on the oligotrophic subtropical gyre where eddies have been suggested to reconcile apparently contradictory observational estimates of nutrient supply and export production. Comparison with observations indicates that the numerical model provides a realistic description of the subtropical eddy field and its interaction with biogeochemical tracers. The model results illustrate that the eddy-induced nitrate flux into the euphotic zone is largest near the margins of the oligotrophic gyre where both vertical and lateral nutrient supply by eddies are effective. Typical values of simulated eddy-induced nitrate supply are 0.05 mol m-2 yr-1, which is much lower than has been suggested previously. This new estimate of eddy-induced nitrate supply is not sufficient to reconcile seemingly contradictory observational estimates of biological production in the subtropics. Alternative sources of fixed nitrogen, deviations from standard elemental stoichiometry, and possible effects of interannual variability will have to be considered in order to resolve apparent observational discrepancies in the oligotrophic subtropical gyres. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Global Biogeochemical Cycles 16 4 53-1 53-11 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
An eddy-resolving coupled ecosystem-circulation model of the North Atlantic is used to investigate the impact of mesoscale variability on the nitrate supply to the light-lit euphotic zone. The focus is on the oligotrophic subtropical gyre where eddies have been suggested to reconcile apparently contradictory observational estimates of nutrient supply and export production. Comparison with observations indicates that the numerical model provides a realistic description of the subtropical eddy field and its interaction with biogeochemical tracers. The model results illustrate that the eddy-induced nitrate flux into the euphotic zone is largest near the margins of the oligotrophic gyre where both vertical and lateral nutrient supply by eddies are effective. Typical values of simulated eddy-induced nitrate supply are 0.05 mol m-2 yr-1, which is much lower than has been suggested previously. This new estimate of eddy-induced nitrate supply is not sufficient to reconcile seemingly contradictory observational estimates of biological production in the subtropics. Alternative sources of fixed nitrogen, deviations from standard elemental stoichiometry, and possible effects of interannual variability will have to be considered in order to resolve apparent observational discrepancies in the oligotrophic subtropical gyres. |
format |
Article in Journal/Newspaper |
author |
Oschlies, Andreas |
spellingShingle |
Oschlies, Andreas Can eddies make ocean deserts bloom? |
author_facet |
Oschlies, Andreas |
author_sort |
Oschlies, Andreas |
title |
Can eddies make ocean deserts bloom? |
title_short |
Can eddies make ocean deserts bloom? |
title_full |
Can eddies make ocean deserts bloom? |
title_fullStr |
Can eddies make ocean deserts bloom? |
title_full_unstemmed |
Can eddies make ocean deserts bloom? |
title_sort |
can eddies make ocean deserts bloom? |
publisher |
AGU (American Geophysical Union) |
publishDate |
2002 |
url |
https://oceanrep.geomar.de/id/eprint/734/ https://oceanrep.geomar.de/id/eprint/734/1/gbc832.pdf https://doi.org/10.1029/2001GB001830 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/734/1/gbc832.pdf Oschlies, A. (2002) Can eddies make ocean deserts bloom?. Open Access Global Biogeochemical Cycles, 16 (4). p. 1106. DOI 10.1029/2001GB001830 <https://doi.org/10.1029/2001GB001830>. doi:10.1029/2001GB001830 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2001GB001830 |
container_title |
Global Biogeochemical Cycles |
container_volume |
16 |
container_issue |
4 |
container_start_page |
53-1 |
op_container_end_page |
53-11 |
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1766131542761930752 |