Nutrient supply to the surface waters of the North Atlantic: A model study
An eddy‐permitting coupled ecosystem‐circulation model with accurate descriptions of advection and turbulent mixing is used to estimate the nitrate supply to the euphotic zone in the North and equatorial Atlantic Ocean. The simulated annual mean input of nitrate into the euphotic zone is separated i...
Published in: | Journal of Geophysical Research |
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AGU (American Geophysical Union)
2002
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Online Access: | https://oceanrep.geomar.de/id/eprint/480/ https://oceanrep.geomar.de/id/eprint/480/1/Oschlies-2002-Journal_of_Geophysical_Research__Oceans_%281978-2012%29.pdf https://doi.org/10.1029/2000JC000275 |
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ftoceanrep:oai:oceanrep.geomar.de:480 2024-09-30T14:39:25+00:00 Nutrient supply to the surface waters of the North Atlantic: A model study Oschlies, Andreas 2002 text https://oceanrep.geomar.de/id/eprint/480/ https://oceanrep.geomar.de/id/eprint/480/1/Oschlies-2002-Journal_of_Geophysical_Research__Oceans_%281978-2012%29.pdf https://doi.org/10.1029/2000JC000275 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/480/1/Oschlies-2002-Journal_of_Geophysical_Research__Oceans_%281978-2012%29.pdf Oschlies, A. (2002) Nutrient supply to the surface waters of the North Atlantic: A model study. Open Access Journal of Geophysical Research: Oceans, 107 (C5). C000275. DOI 10.1029/2000JC000275 <https://doi.org/10.1029/2000JC000275>. doi:10.1029/2000JC000275 info:eu-repo/semantics/openAccess Article PeerReviewed 2002 ftoceanrep https://doi.org/10.1029/2000JC000275 2024-09-04T05:04:40Z An eddy‐permitting coupled ecosystem‐circulation model with accurate descriptions of advection and turbulent mixing is used to estimate the nitrate supply to the euphotic zone in the North and equatorial Atlantic Ocean. The simulated annual mean input of nitrate into the euphotic zone is separated into different supply routes, namely, turbulent vertical mixing, vertical advection, and horizontal transport. Vertical mixing is found to be the dominant supply mechanism in the subpolar North Atlantic, while horizontal advection provides most of the simulated nitrate input into the subtropical gyre. Contributions by vertical advection are largest in the equatorial upwelling region and in the subpolar gyre. A comparison with observational estimates of nitrate flux into euphotic zone of the subtropical gyre reveals that the model can simultaneously fit the estimates by Lewis et al. [1986] and Jenkins [1988] that were previously thought to be contradictory. The simulated nitrate supply is, on the other hand, not consistent with estimates of export production based on oxygen consumption [Jenkins, 1982]. The model results are used to investigate to what extent the advective input of organic matter could possibly explain a local imbalance between new and export production. It turns out that the simulated advective input of organic matter alone, which in the model provides nitrogen at a rate similar to that arising from nitrate supply, is not sufficient to explain observed oxygen consumption rates. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Journal of Geophysical Research 107 C5 |
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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‐permitting coupled ecosystem‐circulation model with accurate descriptions of advection and turbulent mixing is used to estimate the nitrate supply to the euphotic zone in the North and equatorial Atlantic Ocean. The simulated annual mean input of nitrate into the euphotic zone is separated into different supply routes, namely, turbulent vertical mixing, vertical advection, and horizontal transport. Vertical mixing is found to be the dominant supply mechanism in the subpolar North Atlantic, while horizontal advection provides most of the simulated nitrate input into the subtropical gyre. Contributions by vertical advection are largest in the equatorial upwelling region and in the subpolar gyre. A comparison with observational estimates of nitrate flux into euphotic zone of the subtropical gyre reveals that the model can simultaneously fit the estimates by Lewis et al. [1986] and Jenkins [1988] that were previously thought to be contradictory. The simulated nitrate supply is, on the other hand, not consistent with estimates of export production based on oxygen consumption [Jenkins, 1982]. The model results are used to investigate to what extent the advective input of organic matter could possibly explain a local imbalance between new and export production. It turns out that the simulated advective input of organic matter alone, which in the model provides nitrogen at a rate similar to that arising from nitrate supply, is not sufficient to explain observed oxygen consumption rates. |
format |
Article in Journal/Newspaper |
author |
Oschlies, Andreas |
spellingShingle |
Oschlies, Andreas Nutrient supply to the surface waters of the North Atlantic: A model study |
author_facet |
Oschlies, Andreas |
author_sort |
Oschlies, Andreas |
title |
Nutrient supply to the surface waters of the North Atlantic: A model study |
title_short |
Nutrient supply to the surface waters of the North Atlantic: A model study |
title_full |
Nutrient supply to the surface waters of the North Atlantic: A model study |
title_fullStr |
Nutrient supply to the surface waters of the North Atlantic: A model study |
title_full_unstemmed |
Nutrient supply to the surface waters of the North Atlantic: A model study |
title_sort |
nutrient supply to the surface waters of the north atlantic: a model study |
publisher |
AGU (American Geophysical Union) |
publishDate |
2002 |
url |
https://oceanrep.geomar.de/id/eprint/480/ https://oceanrep.geomar.de/id/eprint/480/1/Oschlies-2002-Journal_of_Geophysical_Research__Oceans_%281978-2012%29.pdf https://doi.org/10.1029/2000JC000275 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/480/1/Oschlies-2002-Journal_of_Geophysical_Research__Oceans_%281978-2012%29.pdf Oschlies, A. (2002) Nutrient supply to the surface waters of the North Atlantic: A model study. Open Access Journal of Geophysical Research: Oceans, 107 (C5). C000275. DOI 10.1029/2000JC000275 <https://doi.org/10.1029/2000JC000275>. doi:10.1029/2000JC000275 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2000JC000275 |
container_title |
Journal of Geophysical Research |
container_volume |
107 |
container_issue |
C5 |
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1811642013837164544 |