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Distribution And Rates Of Nitrogen Fixation In The Western Tropical South Pacific Ocean Constrained By Nitrogen Isotope Budgets

Title: Distribution And Rates Of Nitrogen Fixation In The Western Tropical South Pacific Ocean Constrained By Nitrogen Isotope Budgets.
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Name(s): Knapp, Angela N., author
McCabe, Kelly M., author
Grosso, Olivier, author
Leblond, Nathalie, author
Moutin, Thierry, author
Bonnet, Sophie, author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2018-05-04
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/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.
Identifier: FSU_libsubv1_wos_000431435900003 (IID), 10.5194/bg-15-2619-2018 (DOI)
Keywords: fresh-water, n-2 fixation, nitrate, north pacific, iron availability, trichodesmium, export production, global distribution, new-caledonia, phosphate availability
Publication Note: The publisher’s version of record is available at https://doi.org/10.5194/bg-15-2619-2018
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000431435900003
Owner Institution: FSU
Is Part Of: Biogeosciences.
1726-4170
Issue: iss. 9, vol. 15

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Knapp, A. N., McCabe, K. M., Grosso, O., Leblond, N., Moutin, T., & Bonnet, S. (2018). Distribution And Rates Of Nitrogen Fixation In The Western Tropical South Pacific Ocean Constrained By Nitrogen Isotope Budgets. Biogeosciences. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000431435900003