Authigenic apatite and octacalcium phosphate formation due to adsorption–precipitation switching across estuarine salinity gradients

Oxmann, J. F.; Schwendenmann, L.

doi:https://doi.org/10.5194/bg-12-723-2015

Articles | Volume 12, issue 3

https://doi.org/10.5194/bg-12-723-2015

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

https://doi.org/10.5194/bg-12-723-2015

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

Articles | Volume 12, issue 3

Research article

|

06 Feb 2015

Research article |

| 06 Feb 2015

Authigenic apatite and octacalcium phosphate formation due to adsorption–precipitation switching across estuarine salinity gradients

J. F. Oxmann and L. Schwendenmann

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Final revised paper (published on 06 Feb 2015)
Supplement to the final revised paper
Preprint (discussion started on 01 Jul 2014)
Supplement to the preprint

Interactive discussion

Status: closed

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

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RC C4014: 'Phosphorus cycle', Anonymous Referee #1, 01 Aug 2014
- AC C6207: 'Response to Referee #1', Julian Oxmann, 27 Oct 2014
RC C5093: 'General comments', Anonymous Referee #2, 12 Sep 2014
- AC C6213: 'Response to Referee #2', Julian Oxmann, 27 Oct 2014
RC C5282: 'Review of manuscript', Anonymous Referee #3, 22 Sep 2014
- AC C6219: 'Response to Referee #3', Julian Oxmann, 27 Oct 2014

Peer-review completion

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

AR by Julian Oxmann on behalf of the Authors (18 Nov 2014) Author's response

ED: Publish subject to minor revisions (Editor review) (06 Dec 2014) by Caroline P. Slomp

Dear dr. Oxmann,

Thank you for submitting a detailed response to the three reviews and a revised manuscript. Thank you also for following one of the reviewer’s suggestions to make the text more easily accessible. While I am satisfied with most changes made, there are a few minor issues that mostly refer to the revised text that require attention. I kindly ask you to address these issues in what I hope and expect will be a final revision. I look forward to seeing your reply.

1. In the current version of the manuscript, there are (contradictory) statements about the possible dissolution of CFAP in the marine environment. Is there any evidence suggesting that dissolution of CFAP in the marine environment is an important process? Is it necessary to add “probably” in line 18?
The relevant sections are:
- (p3. line 18): “Because seawater is probably close to saturation with CFAP, both a possible formation and dissolution CFAP cannot be rejected”.
- (p14. Line 30-31): Given the possibility that CFAP or other less stable Ca-P phases do not readily dissolve in alkaline seawater…”
- (p15, lines 20-21) “Some authigenic Ca-P, however, could be dissolved when physical-chemical conditions change”.
2. p7. Line 19. Please clarify the term “sediment humidity”. Is that the water filled pore volume or water content? Volume or weight percentage?
3. P11. Lines 6-8. Please rephrase this sentence . The text now suggests that Ca-P is adsorbed.
4. P12. Line 17-19. Sink-switching of Fe-P to CFA is also common in the marine environment. This is discussed in detail in the review on the P cycle by Ruttenberg KC (2003) and (2014; revised version) The Global Phosphorus Cycle, In: Turekian KK, Holland DJ, editors. Treatise on Geochemistry. Elsevier, 585–643. It would be appropriate to also mention this in your paper.
5.P14 . Line 7. Typo in “Octacalcium”

Best regards,

Caroline Slomp

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AR by Julian Oxmann on behalf of the Authors (15 Dec 2014) Author's response Manuscript

ED: Publish as is (29 Dec 2014) by Caroline P. Slomp

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