Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets
International audience Constraining the rates and spatial distribution of dinitrogen (N 2) fixation fluxes to the ocean informs our understanding of the environmental sensitivities of N 2 fixa-tion as well as the timescale over which the fluxes of nitrogen (N) to and from the ocean may respond to ea...
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Online Access: | https://hal.science/hal-01790780 https://hal.science/hal-01790780/document https://hal.science/hal-01790780/file/Knapp_et_al_BG_2018.pdf https://doi.org/10.5194/bg-15-2619-2018 |
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ftinsu:oai:HAL:hal-01790780v1 2023-12-31T10:20:47+01:00 Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets Knapp, Angela Mccabe, Kelly Grosso, Olivier Leblond, Nathalie Moutin, Thierry Bonnet, Sophie Florida State University Tallahassee (FSU) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2018 https://hal.science/hal-01790780 https://hal.science/hal-01790780/document https://hal.science/hal-01790780/file/Knapp_et_al_BG_2018.pdf https://doi.org/10.5194/bg-15-2619-2018 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-15-2619-2018 hal-01790780 https://hal.science/hal-01790780 https://hal.science/hal-01790780/document https://hal.science/hal-01790780/file/Knapp_et_al_BG_2018.pdf doi:10.5194/bg-15-2619-2018 IRD: fdi:010072839 info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.science/hal-01790780 Biogeosciences, 2018, 15 (9), pp.2619-2628. ⟨10.5194/bg-15-2619-2018⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2018 ftinsu https://doi.org/10.5194/bg-15-2619-2018 2023-12-06T17:26:56Z International audience Constraining the rates and spatial distribution of dinitrogen (N 2) fixation fluxes to the ocean informs our understanding of the environmental sensitivities of N 2 fixa-tion as well as the timescale over which the fluxes of nitrogen (N) to and from the ocean may respond to each other. Here we quantify rates of N 2 fixation as well as its contribution to export production along a zonal transect in the western tropical South Pacific (WTSP) Ocean using N isotope (" δ 15 N ") budgets. Comparing measurements of water column nitrate + nitrite δ 15 N with the δ 15 N of sinking particulate N at a western, central, and eastern station, these δ 15 N budgets indicate high, modest, and low rates of N 2 fixation at the respective stations. The results also imply that N 2 fixation supports exceptionally high, i.e. ≥ 50 %, of export production at the western and central stations, which are also prox-imal to the largest iron sources. These geochemically based rates of N 2 fixation are equal to or greater than those previously reported in the tropical North Atlantic, indicating that the WTSP Ocean has the capacity to support globally significant rates of N 2 fixation, which may compensate for N removal in the oxygen-deficient zones of the eastern tropical Pacific. Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Biogeosciences 15 9 2619 2628 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Knapp, Angela Mccabe, Kelly Grosso, Olivier Leblond, Nathalie Moutin, Thierry Bonnet, Sophie Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Constraining the rates and spatial distribution of dinitrogen (N 2) fixation fluxes to the ocean informs our understanding of the environmental sensitivities of N 2 fixa-tion as well as the timescale over which the fluxes of nitrogen (N) to and from the ocean may respond to each other. Here we quantify rates of N 2 fixation as well as its contribution to export production along a zonal transect in the western tropical South Pacific (WTSP) Ocean using N isotope (" δ 15 N ") budgets. Comparing measurements of water column nitrate + nitrite δ 15 N with the δ 15 N of sinking particulate N at a western, central, and eastern station, these δ 15 N budgets indicate high, modest, and low rates of N 2 fixation at the respective stations. The results also imply that N 2 fixation supports exceptionally high, i.e. ≥ 50 %, of export production at the western and central stations, which are also prox-imal to the largest iron sources. These geochemically based rates of N 2 fixation are equal to or greater than those previously reported in the tropical North Atlantic, indicating that the WTSP Ocean has the capacity to support globally significant rates of N 2 fixation, which may compensate for N removal in the oxygen-deficient zones of the eastern tropical Pacific. |
author2 |
Florida State University Tallahassee (FSU) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Knapp, Angela Mccabe, Kelly Grosso, Olivier Leblond, Nathalie Moutin, Thierry Bonnet, Sophie |
author_facet |
Knapp, Angela Mccabe, Kelly Grosso, Olivier Leblond, Nathalie Moutin, Thierry Bonnet, Sophie |
author_sort |
Knapp, Angela |
title |
Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets |
title_short |
Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets |
title_full |
Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets |
title_fullStr |
Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets |
title_full_unstemmed |
Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets |
title_sort |
distribution and rates of nitrogen fixation in the western tropical south pacific ocean constrained by nitrogen isotope budgets |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-01790780 https://hal.science/hal-01790780/document https://hal.science/hal-01790780/file/Knapp_et_al_BG_2018.pdf https://doi.org/10.5194/bg-15-2619-2018 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.science/hal-01790780 Biogeosciences, 2018, 15 (9), pp.2619-2628. ⟨10.5194/bg-15-2619-2018⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-15-2619-2018 hal-01790780 https://hal.science/hal-01790780 https://hal.science/hal-01790780/document https://hal.science/hal-01790780/file/Knapp_et_al_BG_2018.pdf doi:10.5194/bg-15-2619-2018 IRD: fdi:010072839 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-15-2619-2018 |
container_title |
Biogeosciences |
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15 |
container_issue |
9 |
container_start_page |
2619 |
op_container_end_page |
2628 |
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1786831322215350272 |