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


Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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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.