Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets
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 fixation as well as the timescale over which the fluxes of nitrogen (N) to and from the ocean may respond to each other. Here we quant...
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ftdoajarticles:oai:doaj.org/article:b1cbe75d2738452293c18f5e459dda17 2023-05-15T17:33:59+02:00 Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets A. N. Knapp K. M. McCabe O. Grosso N. Leblond T. Moutin S. Bonnet 2018-05-01T00:00:00Z https://doi.org/10.5194/bg-15-2619-2018 https://doaj.org/article/b1cbe75d2738452293c18f5e459dda17 EN eng Copernicus Publications https://www.biogeosciences.net/15/2619/2018/bg-15-2619-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-2619-2018 1726-4170 1726-4189 https://doaj.org/article/b1cbe75d2738452293c18f5e459dda17 Biogeosciences, Vol 15, Pp 2619-2628 (2018) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.5194/bg-15-2619-2018 2022-12-31T15:52:20Z 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 fixation 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 (<q> δ 15 N</q>) 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 proximal 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 Directory of Open Access Journals: DOAJ Articles Pacific Biogeosciences 15 9 2619 2628 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 A. N. Knapp K. M. McCabe O. Grosso N. Leblond T. Moutin S. Bonnet Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
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 fixation 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 (<q> δ 15 N</q>) 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 proximal 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. |
format |
Article in Journal/Newspaper |
author |
A. N. Knapp K. M. McCabe O. Grosso N. Leblond T. Moutin S. Bonnet |
author_facet |
A. N. Knapp K. M. McCabe O. Grosso N. Leblond T. Moutin S. Bonnet |
author_sort |
A. N. Knapp |
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 |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-2619-2018 https://doaj.org/article/b1cbe75d2738452293c18f5e459dda17 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Biogeosciences, Vol 15, Pp 2619-2628 (2018) |
op_relation |
https://www.biogeosciences.net/15/2619/2018/bg-15-2619-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-2619-2018 1726-4170 1726-4189 https://doaj.org/article/b1cbe75d2738452293c18f5e459dda17 |
op_doi |
https://doi.org/10.5194/bg-15-2619-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
9 |
container_start_page |
2619 |
op_container_end_page |
2628 |
_version_ |
1766132656743907328 |