Nitrogen fixation in the eastern Atlantic reaches similar levels in the Southern and Northern Hemisphere
Euphotic layer dinitrogen (N-2) fixation and primary production (PP) were measured in the eastern Atlantic Ocean (38 degrees N-21 degrees S) using N-15(2) and C-13 bicarbonate tracer incubations. This region is influenced by Saharan dust deposition and waters with low nitrogen to phosphorus (N/P) ra...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://doi.org/10.1002/2016JC012335 https://archimer.ifremer.fr/doc/00379/49009/49451.pdf https://archimer.ifremer.fr/doc/00379/49009/49452.pdf https://archimer.ifremer.fr/doc/00379/49009/49453.xlsx |
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fttriple:oai:gotriple.eu:10670/1.djszv9 2023-05-15T17:30:07+02:00 Nitrogen fixation in the eastern Atlantic reaches similar levels in the Southern and Northern Hemisphere Fonseca-batista, Debany Dehairs, Frank Riou, Virginie Fripiat, Francois Elskens, Marc Deman, Florian Brion, Natacha Queroue, Fabien Bode, Maya Auel, Holger https://doi.org/10.1002/2016JC012335 https://archimer.ifremer.fr/doc/00379/49009/49451.pdf https://archimer.ifremer.fr/doc/00379/49009/49452.pdf https://archimer.ifremer.fr/doc/00379/49009/49453.xlsx en eng Amer Geophysical Union doi:10.1002/2016JC012335 10670/1.djszv9 https://archimer.ifremer.fr/doc/00379/49009/49451.pdf https://archimer.ifremer.fr/doc/00379/49009/49452.pdf https://archimer.ifremer.fr/doc/00379/49009/49453.xlsx Archimer, archive institutionnelle de l'Ifremer Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2017-01 , Vol. 122 , N. 1 , P. 587-601 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1002/2016JC012335 2023-01-22T17:10:39Z Euphotic layer dinitrogen (N-2) fixation and primary production (PP) were measured in the eastern Atlantic Ocean (38 degrees N-21 degrees S) using N-15(2) and C-13 bicarbonate tracer incubations. This region is influenced by Saharan dust deposition and waters with low nitrogen to phosphorus (N/P) ratios originating from the Subantarctic and the Benguela upwelling system. Depth-integrated rates of N-2 fixation in the north (0 degrees N-38 degrees N) ranged from 59 to 370 mu mol N m(-2) d(-1), with the maximal value at 19 degrees N under the influence of the northwest African upwelling. Diazotrophic activity in the south (0 degrees S-21 degrees S), though slightly lower, was surprisingly close to observations in the north, with values ranging from 47 to 119 mu mol N m(-2) d(-1). Our North Atlantic N-2 fixation rates correlate well with dust deposition, while those in the South Atlantic correlate strongly with excess phosphate relative to nitrate. There, the necessary iron is assumed to be supplied from the Benguela upwelling system. When converting N-2 fixation to carbon uptake using a Redfield ratio (6.6), we find that N-2 fixation may support up to 9% of PP in the subtropical North Atlantic (20 degrees N-38 degrees N), 5% in the tropical North Atlantic (0 degrees N-20 degrees N), and 1% of PP in the South Atlantic (0 degrees S-21 degrees S). Combining our data with published data sets, we estimate an annual N input of 27.610 Tg N yr(-1) over the open Atlantic Ocean, 11% of which enters the region between 20 degrees N and 50 degrees N, 71% between 20 degrees N and 10 degrees S, and 18% between 10 degrees N and 45 degrees S. Text North Atlantic Unknown Journal of Geophysical Research: Oceans 122 1 587 601 |
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envir geo Fonseca-batista, Debany Dehairs, Frank Riou, Virginie Fripiat, Francois Elskens, Marc Deman, Florian Brion, Natacha Queroue, Fabien Bode, Maya Auel, Holger Nitrogen fixation in the eastern Atlantic reaches similar levels in the Southern and Northern Hemisphere |
topic_facet |
envir geo |
description |
Euphotic layer dinitrogen (N-2) fixation and primary production (PP) were measured in the eastern Atlantic Ocean (38 degrees N-21 degrees S) using N-15(2) and C-13 bicarbonate tracer incubations. This region is influenced by Saharan dust deposition and waters with low nitrogen to phosphorus (N/P) ratios originating from the Subantarctic and the Benguela upwelling system. Depth-integrated rates of N-2 fixation in the north (0 degrees N-38 degrees N) ranged from 59 to 370 mu mol N m(-2) d(-1), with the maximal value at 19 degrees N under the influence of the northwest African upwelling. Diazotrophic activity in the south (0 degrees S-21 degrees S), though slightly lower, was surprisingly close to observations in the north, with values ranging from 47 to 119 mu mol N m(-2) d(-1). Our North Atlantic N-2 fixation rates correlate well with dust deposition, while those in the South Atlantic correlate strongly with excess phosphate relative to nitrate. There, the necessary iron is assumed to be supplied from the Benguela upwelling system. When converting N-2 fixation to carbon uptake using a Redfield ratio (6.6), we find that N-2 fixation may support up to 9% of PP in the subtropical North Atlantic (20 degrees N-38 degrees N), 5% in the tropical North Atlantic (0 degrees N-20 degrees N), and 1% of PP in the South Atlantic (0 degrees S-21 degrees S). Combining our data with published data sets, we estimate an annual N input of 27.610 Tg N yr(-1) over the open Atlantic Ocean, 11% of which enters the region between 20 degrees N and 50 degrees N, 71% between 20 degrees N and 10 degrees S, and 18% between 10 degrees N and 45 degrees S. |
format |
Text |
author |
Fonseca-batista, Debany Dehairs, Frank Riou, Virginie Fripiat, Francois Elskens, Marc Deman, Florian Brion, Natacha Queroue, Fabien Bode, Maya Auel, Holger |
author_facet |
Fonseca-batista, Debany Dehairs, Frank Riou, Virginie Fripiat, Francois Elskens, Marc Deman, Florian Brion, Natacha Queroue, Fabien Bode, Maya Auel, Holger |
author_sort |
Fonseca-batista, Debany |
title |
Nitrogen fixation in the eastern Atlantic reaches similar levels in the Southern and Northern Hemisphere |
title_short |
Nitrogen fixation in the eastern Atlantic reaches similar levels in the Southern and Northern Hemisphere |
title_full |
Nitrogen fixation in the eastern Atlantic reaches similar levels in the Southern and Northern Hemisphere |
title_fullStr |
Nitrogen fixation in the eastern Atlantic reaches similar levels in the Southern and Northern Hemisphere |
title_full_unstemmed |
Nitrogen fixation in the eastern Atlantic reaches similar levels in the Southern and Northern Hemisphere |
title_sort |
nitrogen fixation in the eastern atlantic reaches similar levels in the southern and northern hemisphere |
publisher |
Amer Geophysical Union |
url |
https://doi.org/10.1002/2016JC012335 https://archimer.ifremer.fr/doc/00379/49009/49451.pdf https://archimer.ifremer.fr/doc/00379/49009/49452.pdf https://archimer.ifremer.fr/doc/00379/49009/49453.xlsx |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Archimer, archive institutionnelle de l'Ifremer Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2017-01 , Vol. 122 , N. 1 , P. 587-601 |
op_relation |
doi:10.1002/2016JC012335 10670/1.djszv9 https://archimer.ifremer.fr/doc/00379/49009/49451.pdf https://archimer.ifremer.fr/doc/00379/49009/49452.pdf https://archimer.ifremer.fr/doc/00379/49009/49453.xlsx |
op_doi |
https://doi.org/10.1002/2016JC012335 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
122 |
container_issue |
1 |
container_start_page |
587 |
op_container_end_page |
601 |
_version_ |
1766125926627672064 |