Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre
To enable an accurate estimate of total excess nitrogen (N) in the North Atlantic, a new tracer TNxs is defined, which includes the contribution of organic nutrients to the assessment of N:P stoichiometric anomalies. We measured the spatial distribution of TNxs within the subtropical North Atlantic...
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Language: | English |
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Copernicus Publications (EGU)
2008
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ftoceanrep:oai:oceanrep.geomar.de:7983 2023-05-15T17:27:30+02:00 Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre Landolfi, Angela Oschlies, Andreas Sanders, R. 2008 text https://oceanrep.geomar.de/id/eprint/7983/ https://oceanrep.geomar.de/id/eprint/7983/1/194_Landolfi_2008_OrganicNutrientsAndExcessNitrogen_Artzeit_pubid9966.pdf https://doi.org/10.5194/bg-5-1199-2008 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/7983/1/194_Landolfi_2008_OrganicNutrientsAndExcessNitrogen_Artzeit_pubid9966.pdf Landolfi, A. , Oschlies, A. and Sanders, R. (2008) Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre. Open Access Biogeosciences (BG), 5 . pp. 1199-1213. DOI 10.5194/bg-5-1199-2008 <https://doi.org/10.5194/bg-5-1199-2008>. doi:10.5194/bg-5-1199-2008 info:eu-repo/semantics/openAccess Article PeerReviewed 2008 ftoceanrep https://doi.org/10.5194/bg-5-1199-2008 2023-04-07T14:55:48Z To enable an accurate estimate of total excess nitrogen (N) in the North Atlantic, a new tracer TNxs is defined, which includes the contribution of organic nutrients to the assessment of N:P stoichiometric anomalies. We measured the spatial distribution of TNxs within the subtropical North Atlantic using data from a trans-Atlantic section across 24.5° N occupied in 2004. We then employ three different approaches to infer rates of total excess nitrogen accumulation using pCFC-12 derived ventilation ages (a TNxs vertical integration, a one end-member and a two-end member mixing model). Despite some variability among the different methods the dissolved organic nutrient fraction always contributes to about half of the TNxs accumulation, which is in the order of 9.38±4.18×1011 mol N y−1. We suggest that neglecting organic nutrients in stoichiometric balances of the marine N and P inventories can lead to systematic errors when estimating deviations of nitrogen excess or deficit relative to the Redfield ratio in the oceans. For the North Atlantic the inclusion of the organic fraction to the excess nitrogen pool leads to an upward revision of the N supply by N2 fixation to 10.2±6.9×1011 mol N y−1. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Biogeosciences 5 5 1199 1213 |
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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 |
To enable an accurate estimate of total excess nitrogen (N) in the North Atlantic, a new tracer TNxs is defined, which includes the contribution of organic nutrients to the assessment of N:P stoichiometric anomalies. We measured the spatial distribution of TNxs within the subtropical North Atlantic using data from a trans-Atlantic section across 24.5° N occupied in 2004. We then employ three different approaches to infer rates of total excess nitrogen accumulation using pCFC-12 derived ventilation ages (a TNxs vertical integration, a one end-member and a two-end member mixing model). Despite some variability among the different methods the dissolved organic nutrient fraction always contributes to about half of the TNxs accumulation, which is in the order of 9.38±4.18×1011 mol N y−1. We suggest that neglecting organic nutrients in stoichiometric balances of the marine N and P inventories can lead to systematic errors when estimating deviations of nitrogen excess or deficit relative to the Redfield ratio in the oceans. For the North Atlantic the inclusion of the organic fraction to the excess nitrogen pool leads to an upward revision of the N supply by N2 fixation to 10.2±6.9×1011 mol N y−1. |
format |
Article in Journal/Newspaper |
author |
Landolfi, Angela Oschlies, Andreas Sanders, R. |
spellingShingle |
Landolfi, Angela Oschlies, Andreas Sanders, R. Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
author_facet |
Landolfi, Angela Oschlies, Andreas Sanders, R. |
author_sort |
Landolfi, Angela |
title |
Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
title_short |
Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
title_full |
Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
title_fullStr |
Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
title_full_unstemmed |
Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre |
title_sort |
organic nutrients and excess nitrogen in the north atlantic subtropical gyre |
publisher |
Copernicus Publications (EGU) |
publishDate |
2008 |
url |
https://oceanrep.geomar.de/id/eprint/7983/ https://oceanrep.geomar.de/id/eprint/7983/1/194_Landolfi_2008_OrganicNutrientsAndExcessNitrogen_Artzeit_pubid9966.pdf https://doi.org/10.5194/bg-5-1199-2008 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/7983/1/194_Landolfi_2008_OrganicNutrientsAndExcessNitrogen_Artzeit_pubid9966.pdf Landolfi, A. , Oschlies, A. and Sanders, R. (2008) Organic nutrients and excess nitrogen in the North Atlantic subtropical gyre. Open Access Biogeosciences (BG), 5 . pp. 1199-1213. DOI 10.5194/bg-5-1199-2008 <https://doi.org/10.5194/bg-5-1199-2008>. doi:10.5194/bg-5-1199-2008 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-5-1199-2008 |
container_title |
Biogeosciences |
container_volume |
5 |
container_issue |
5 |
container_start_page |
1199 |
op_container_end_page |
1213 |
_version_ |
1766119644951740416 |