Nitrogen cycling in the Southern Ocean Kerguelen Plateau area: evidence for significant surface nitrification from nitrate isotopic compositions

Dehairs, F.; Fripiat, F.; Cavagna, A.-J.; Trull, T. W.; Fernandez, C.; Davies, D.; Roukaerts, A.; Fonseca Batista, D.; Planchon, F.; Elskens, M.

doi:https://doi.org/10.5194/bg-12-1459-2015

Articles | Volume 12, issue 5

https://doi.org/10.5194/bg-12-1459-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue:

KEOPS2: Kerguelen Ocean and Plateau Study 2

https://doi.org/10.5194/bg-12-1459-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 12, issue 5

Research article

|

05 Mar 2015

Research article |

| 05 Mar 2015

Nitrogen cycling in the Southern Ocean Kerguelen Plateau area: evidence for significant surface nitrification from nitrate isotopic compositions

F. Dehairs, F. Fripiat, A.-J. Cavagna, T. W. Trull, C. Fernandez, D. Davies, A. Roukaerts, D. Fonseca Batista, F. Planchon, and M. Elskens

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Final revised paper (published on 05 Mar 2015)
Preprint (discussion started on 26 Sep 2014)

Interactive discussion

Status: closed

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

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RC C6118: 'Comments for the authors', Anonymous Referee #1, 24 Oct 2014
RC C6195: 'Dehairs et al.', Anonymous Referee #2, 25 Oct 2014
AC C7506: 'Reply to Reviewer 1', Frank Dehairs, 19 Dec 2014
AC C7511: 'bg-2014-443: Reply to Reviewer #2', Frank Dehairs, 19 Dec 2014

Peer-review completion

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

AR by Frank Dehairs on behalf of the Authors (06 Jan 2015) Author's response Manuscript

ED: Publish subject to minor revisions (Editor review) (16 Jan 2015) by stephane blain

AR by Frank Dehairs on behalf of the Authors (28 Jan 2015) Author's response Manuscript

ED: Publish subject to technical corrections (03 Feb 2015) by stephane blain

AR by Frank Dehairs on behalf of the Authors (03 Feb 2015) Manuscript

Short summary

We investigated the nitrate N, O isotopic composition for the Southern Ocean Kerguelen Plateau area, aiming at understanding the N-cycling in this naturally iron fertilized area characterized by large recurrent phytoplankton blooms. The system is characterized by moderate consumption of nitrate over the season while silicic acid, on the contrary, becomes depleted, suggesting significant recycling of N. Mixed layer nitrate isotopic signatures corroborate this.