Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets

Knapp, Angela N.; McCabe, Kelly M.; Grosso, Olivier; Leblond, Nathalie; Moutin, Thierry; Bonnet, Sophie

doi:https://doi.org/10.5194/bg-15-2619-2018

Articles | Volume 15, issue 9

https://doi.org/10.5194/bg-15-2619-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Interactions between planktonic organisms and biogeochemical...

https://doi.org/10.5194/bg-15-2619-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 15, issue 9

Research article

|

04 May 2018

Research article |

| 04 May 2018

Distribution and rates of nitrogen fixation in the western tropical South Pacific Ocean constrained by nitrogen isotope budgets

Angela N. Knapp, Kelly M. McCabe, Olivier Grosso, Nathalie Leblond, Thierry Moutin, and Sophie Bonnet

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Final revised paper (published on 04 May 2018)
Preprint (discussion started on 10 Jan 2018)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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RC1: 'Review comments', Anonymous Referee #1, 06 Feb 2018
- AC1: 'Response to Reviewer #1', Angela Knapp, 15 Apr 2018
  - AC3: 'Revised Figure', Angela Knapp, 15 Apr 2018
RC2: 'Revision bg-2017-564, Knapp et al 2018', Anonymous Referee #2, 06 Feb 2018
- AC2: 'Response to Reviewer #2', Angela Knapp, 15 Apr 2018

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

ED: Publish subject to minor revisions (review by editor) (16 Apr 2018) by Emilio Marañón

AR by Angela Knapp on behalf of the Authors (17 Apr 2018) Manuscript

ED: Publish as is (18 Apr 2018) by Emilio Marañón

AR by Angela Knapp on behalf of the Authors (18 Apr 2018)

Short summary

The spatial distribution of biological N₂ fixation fluxes to the ocean remains poorly constrained. Here we use nitrogen isotope budgets to identify significant N₂ fixation inputs to the western tropical South Pacific (WTSP), where N₂ fixation supports > 50 % of export production at stations proximal to iron sources. The significant N₂ fixation inputs in the WTSP may offset nitrogen loss in the oxygen-deficient zones of the eastern tropical South Pacific.