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 quanti...
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Online Access: | https://doi.org/10.5194/bg-15-2619-2018 http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000431435900003 http://fsu.digital.flvc.org/islandora/object/fsu%3A606078/datastream/TN/view/Distribution%20And%20Rates%20Of%20Nitrogen%20Fixation%20In%20The%20Western%20Tropical%20South%20Pacific%20Ocean%20Constrained%20By%20Nitrogen%20Isotope%20Budgets.jpg |
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ftfloridastunidc:oai:fsu.digital.flvc.org:fsu_606078 2023-05-15T17:34:47+02:00 Distribution And Rates Of Nitrogen Fixation In The Western Tropical South Pacific Ocean Constrained By Nitrogen Isotope Budgets Knapp, Angela N. (authoraut) McCabe, Kelly M. (authoraut) Grosso, Olivier (authoraut) Leblond, Nathalie (authoraut) Moutin, Thierry (authoraut) Bonnet, Sophie (authoraut) 1 online resource computer application/pdf https://doi.org/10.5194/bg-15-2619-2018 http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000431435900003 http://fsu.digital.flvc.org/islandora/object/fsu%3A606078/datastream/TN/view/Distribution%20And%20Rates%20Of%20Nitrogen%20Fixation%20In%20The%20Western%20Tropical%20South%20Pacific%20Ocean%20Constrained%20By%20Nitrogen%20Isotope%20Budgets.jpg English eng eng Biogeosciences--1726-4170 Text journal article ftfloridastunidc https://doi.org/10.5194/bg-15-2619-2018 2020-08-10T18:57:36Z 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 ("delta N-15") budgets. Comparing measurements of water column nitrate + nitrite delta N-15 with the delta N-15 of sinking particulate N at a western, central, and eastern station, these delta N-15 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. fresh-water, n-2 fixation, nitrate, north pacific, iron availability, trichodesmium, export production, global distribution, new-caledonia, phosphate availability The publisher’s version of record is available at https://doi.org/10.5194/bg-15-2619-2018 Article in Journal/Newspaper North Atlantic Florida State University Digital Library (FSUDL) Pacific Biogeosciences 15 9 2619 2628 |
institution |
Open Polar |
collection |
Florida State University Digital Library (FSUDL) |
op_collection_id |
ftfloridastunidc |
language |
English |
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 ("delta N-15") budgets. Comparing measurements of water column nitrate + nitrite delta N-15 with the delta N-15 of sinking particulate N at a western, central, and eastern station, these delta N-15 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. fresh-water, n-2 fixation, nitrate, north pacific, iron availability, trichodesmium, export production, global distribution, new-caledonia, phosphate availability The publisher’s version of record is available at https://doi.org/10.5194/bg-15-2619-2018 |
author2 |
Knapp, Angela N. (authoraut) McCabe, Kelly M. (authoraut) Grosso, Olivier (authoraut) Leblond, Nathalie (authoraut) Moutin, Thierry (authoraut) Bonnet, Sophie (authoraut) |
format |
Article in Journal/Newspaper |
title |
Distribution And Rates Of Nitrogen Fixation In The Western Tropical South Pacific Ocean Constrained By Nitrogen Isotope Budgets |
spellingShingle |
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 |
url |
https://doi.org/10.5194/bg-15-2619-2018 http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000431435900003 http://fsu.digital.flvc.org/islandora/object/fsu%3A606078/datastream/TN/view/Distribution%20And%20Rates%20Of%20Nitrogen%20Fixation%20In%20The%20Western%20Tropical%20South%20Pacific%20Ocean%20Constrained%20By%20Nitrogen%20Isotope%20Budgets.jpg |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Biogeosciences--1726-4170 |
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 |
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1766133738224222208 |