Contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin
We used 15N-labeled substrates to measure dinitrogen (N2) fixation, nitrate and ammonium uptake, regeneration and associated dissolved organic nitrogen (DON) release in a coastal upwelling system (Cape Ghir, ∼31°N) and an open ocean grid (bounded between 25°–42°N and 20°W) in the Canary Current regi...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Centro Oceanográfico de A Coruña
2014
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Online Access: | http://hdl.handle.net/10508/8571 http://hdl.handle.net/10261/316585 https://doi.org/10.1016/j.dsr.2013.07.004 |
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ftcsic:oai:digital.csic.es:10261/316585 2024-02-11T10:06:35+01:00 Contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin Benavides, M. Arístegui, J. Agawin, N.S.R. (Nona S.R.) Álvarez-Salgado, X.A. (Xosé Antón) Álvarez, M. (Marta) Troupin, C. (Charles) Atlantic Ocean North Atlantic Northeast Atlantic 2014-11-21T10:28:11Z http://hdl.handle.net/10508/8571 http://hdl.handle.net/10261/316585 https://doi.org/10.1016/j.dsr.2013.07.004 unknown Centro Oceanográfico de A Coruña http://hdl.handle.net/10508/8571 http://hdl.handle.net/10261/316585 doi:10.1016/j.dsr.2013.07.004 Deep-Sea Research Part I-Oceanographic Research Papers, 81. 2013: 36-48 6189 none research article 2014 ftcsic https://doi.org/10.1016/j.dsr.2013.07.004 2024-01-16T11:44:34Z We used 15N-labeled substrates to measure dinitrogen (N2) fixation, nitrate and ammonium uptake, regeneration and associated dissolved organic nitrogen (DON) release in a coastal upwelling system (Cape Ghir, ∼31°N) and an open ocean grid (bounded between 25°–42°N and 20°W) in the Canary Current region during the summer of 2009. New production (Pnew= uptake+N2 fixation+DON released from uptake− regeneration) was higher in the upwelling than in the open ocean zone (0.126 and 0.014 µmol N L−1 h−1, respectively), while regenerated production (Preg= uptake+DON released from uptake+ regeneration) was similar in both zones (0.157 and 0.133 µmol N L−1 h−1, respectively). The resulting f-ratio (Pnew/Pnew+Preg) for the open ocean and upwelling zones was 0.08 and 0.48, respectively. The availability of nitrogen in excess of that expected from Redfield stoichiometry is generally attributed to N2 fixation. A previous study indicated that our open ocean grid zone had an excess nitrogen production rate of 40±22×1010 mol N yr−1. We revisited this budget including new dissolved organic matter and fluxes through the Strait of Gibraltar and estimated a revised nitrogen excess rate of 22±19×1010 mol N yr−1. The average volumetric rate of N2 fixation for this zone was only 1.3×10−3 nmol N L−1 d−1, indicating that its influence in Pnew and nitrogen excess production in this part of the Atlantic is negligible. 2 Article in Journal/Newspaper North Atlantic Northeast Atlantic Digital.CSIC (Spanish National Research Council) Deep Sea Research Part I: Oceanographic Research Papers 81 36 48 |
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Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
description |
We used 15N-labeled substrates to measure dinitrogen (N2) fixation, nitrate and ammonium uptake, regeneration and associated dissolved organic nitrogen (DON) release in a coastal upwelling system (Cape Ghir, ∼31°N) and an open ocean grid (bounded between 25°–42°N and 20°W) in the Canary Current region during the summer of 2009. New production (Pnew= uptake+N2 fixation+DON released from uptake− regeneration) was higher in the upwelling than in the open ocean zone (0.126 and 0.014 µmol N L−1 h−1, respectively), while regenerated production (Preg= uptake+DON released from uptake+ regeneration) was similar in both zones (0.157 and 0.133 µmol N L−1 h−1, respectively). The resulting f-ratio (Pnew/Pnew+Preg) for the open ocean and upwelling zones was 0.08 and 0.48, respectively. The availability of nitrogen in excess of that expected from Redfield stoichiometry is generally attributed to N2 fixation. A previous study indicated that our open ocean grid zone had an excess nitrogen production rate of 40±22×1010 mol N yr−1. We revisited this budget including new dissolved organic matter and fluxes through the Strait of Gibraltar and estimated a revised nitrogen excess rate of 22±19×1010 mol N yr−1. The average volumetric rate of N2 fixation for this zone was only 1.3×10−3 nmol N L−1 d−1, indicating that its influence in Pnew and nitrogen excess production in this part of the Atlantic is negligible. 2 |
format |
Article in Journal/Newspaper |
author |
Benavides, M. Arístegui, J. Agawin, N.S.R. (Nona S.R.) Álvarez-Salgado, X.A. (Xosé Antón) Álvarez, M. (Marta) Troupin, C. (Charles) |
spellingShingle |
Benavides, M. Arístegui, J. Agawin, N.S.R. (Nona S.R.) Álvarez-Salgado, X.A. (Xosé Antón) Álvarez, M. (Marta) Troupin, C. (Charles) Contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
author_facet |
Benavides, M. Arístegui, J. Agawin, N.S.R. (Nona S.R.) Álvarez-Salgado, X.A. (Xosé Antón) Álvarez, M. (Marta) Troupin, C. (Charles) |
author_sort |
Benavides, M. |
title |
Contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
title_short |
Contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
title_full |
Contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
title_fullStr |
Contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
title_full_unstemmed |
Contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin |
title_sort |
contribution of n2 fixation to new production and excess nitrogen in the subtropical northeast atlantic margin |
publisher |
Centro Oceanográfico de A Coruña |
publishDate |
2014 |
url |
http://hdl.handle.net/10508/8571 http://hdl.handle.net/10261/316585 https://doi.org/10.1016/j.dsr.2013.07.004 |
op_coverage |
Atlantic Ocean North Atlantic Northeast Atlantic |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_relation |
http://hdl.handle.net/10508/8571 http://hdl.handle.net/10261/316585 doi:10.1016/j.dsr.2013.07.004 Deep-Sea Research Part I-Oceanographic Research Papers, 81. 2013: 36-48 6189 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.dsr.2013.07.004 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
81 |
container_start_page |
36 |
op_container_end_page |
48 |
_version_ |
1790604384662454272 |