Assessing land–ocean connectivity via submarine groundwater discharge (SGD)
in the Ria Formosa Lagoon (Portugal): combining radon measurements and
stable isotope hydrology

Rocha, Carlos; Veiga-Pires, Cristina; Scholten, Jan; Knoeller, Kay; Gröcke, Darren R.; Carvalho, Liliana; Anibal, Jaime; Wilson, Jean

doi:https://doi.org/10.5194/hess-20-3077-2016

Articles | Volume 20, issue 8

https://doi.org/10.5194/hess-20-3077-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/hess-20-3077-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 20, issue 8

Research article

|

01 Aug 2016

Research article |

| 01 Aug 2016

Assessing land–ocean connectivity via submarine groundwater discharge (SGD) in the Ria Formosa Lagoon (Portugal): combining radon measurements and stable isotope hydrology

Carlos Rocha, Cristina Veiga-Pires, Jan Scholten, Kay Knoeller, Darren R. Gröcke, Liliana Carvalho, Jaime Anibal, and Jean Wilson

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Final revised paper (published on 01 Aug 2016)
Supplement to the final revised paper
Preprint (discussion started on 27 Nov 2015)
Supplement to the preprint

Interactive discussion

Status: closed

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

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- Supplement

RC C5845: 'Revier Comments', Anonymous Referee #1, 28 Dec 2015
- AC C6954: 'Author Response to comment C5845-reviewer 1', Carlos Rocha, 07 Mar 2016
RC C6187: 'Rocha et al Review', Anonymous Referee #2, 17 Jan 2016
- AC C6955: 'Author response to comment C6187-reviewer 2', Carlos Rocha, 07 Mar 2016
RC C6634: 'Review', Anonymous Referee #3, 05 Feb 2016
- AC C6956: 'Authors Response to comment C6634-reviewer 3', Carlos Rocha, 07 Mar 2016

Peer-review completion

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

ED: Reconsider after major revisions (07 Apr 2016) by Markus Weiler

AR by Carlos Rocha on behalf of the Authors (04 May 2016) Author's response Manuscript

ED: Referee Nomination & Report Request started (16 May 2016) by Markus Weiler

RR by Anonymous Referee #3 (04 Jun 2016)

RR by Anonymous Referee #2 (21 Jun 2016)

ED: Publish as is (28 Jun 2016) by Markus Weiler

Short summary

We combine radon and stable isotopes in water to determine total submarine groundwater discharge (SGD) in the Ria Formosa and discriminate its component modes. We show that tidal action filters the entire water volume in the lagoon through local beaches 3.5 times a year, driving an estimated 350Ton nitrogen/year into the system. Conversely, fresh groundwater is discharged into the lagoon only occasionally, adding ~ 61 Ton nitrogen/year, but is capable of driving new production in the system.