Using the radium quartet to quantify submarine groundwater discharge and porewater exchange
16 pages, 8 figures, 1 table, supplementary data https://dx.doi.org/10.1016/j.gca.2016.09.016
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Meteoritical Society
2017-01
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| Subjects: | Radium isotopes, Submarine groundwater discharge, Bioirrigation, Mediterranean, Alfacs Bay, Porewater exchange, |
| Online Access: | http://hdl.handle.net/10261/148090 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/100005243 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/501100001665 |
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Radium isotopes Submarine groundwater discharge Bioirrigation Mediterranean Alfacs Bay Porewater exchange Radium isotopes Submarine groundwater discharge Bioirrigation Mediterranean Alfacs Bay Porewater exchange |
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Radium isotopes Submarine groundwater discharge Bioirrigation Mediterranean Alfacs Bay Porewater exchange Radium isotopes Submarine groundwater discharge Bioirrigation Mediterranean Alfacs Bay Porewater exchange Rodellas, Valentí García-Orellana, Jordi Trezzi, Giada Masqué, Pere Stieglitz, Thomas C. Bokuniewicz, Henry J. Cochran, J.K. Berdalet, Elisa Using the radium quartet to quantify submarine groundwater discharge and porewater exchange |
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16 pages, 8 figures, 1 table, supplementary data https://dx.doi.org/10.1016/j.gca.2016.09.016 |
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European Commission |
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European Commission Rodellas, Valentí García-Orellana, Jordi Trezzi, Giada Masqué, Pere Stieglitz, Thomas C. Bokuniewicz, Henry J. Cochran, J.K. Berdalet, Elisa |
| format |
artículo |
| topic_facet |
Radium isotopes Submarine groundwater discharge Bioirrigation Mediterranean Alfacs Bay Porewater exchange |
| author |
Rodellas, Valentí García-Orellana, Jordi Trezzi, Giada Masqué, Pere Stieglitz, Thomas C. Bokuniewicz, Henry J. Cochran, J.K. Berdalet, Elisa |
| author_sort |
Rodellas, Valentí |
| title |
Using the radium quartet to quantify submarine groundwater discharge and porewater exchange |
| title_short |
Using the radium quartet to quantify submarine groundwater discharge and porewater exchange |
| title_full |
Using the radium quartet to quantify submarine groundwater discharge and porewater exchange |
| title_fullStr |
Using the radium quartet to quantify submarine groundwater discharge and porewater exchange |
| title_full_unstemmed |
Using the radium quartet to quantify submarine groundwater discharge and porewater exchange |
| title_sort |
using the radium quartet to quantify submarine groundwater discharge and porewater exchange |
| publisher |
Meteoritical Society |
| publishDate |
2017-01 |
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http://hdl.handle.net/10261/148090 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/100005243 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/501100001665 |
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1777666565863374848 |
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dig-icm-es-10261-1480902022-08-17T07:02:44Z Using the radium quartet to quantify submarine groundwater discharge and porewater exchange Rodellas, Valentí García-Orellana, Jordi Trezzi, Giada Masqué, Pere Stieglitz, Thomas C. Bokuniewicz, Henry J. Cochran, J.K. Berdalet, Elisa European Commission United Nations Educational, Scientific and Cultural Organization Ministerio de Economía y Competitividad (España) Generalitat de Catalunya Agence Nationale de la Recherche (France) Radium isotopes Submarine groundwater discharge Bioirrigation Mediterranean Alfacs Bay Porewater exchange 16 pages, 8 figures, 1 table, supplementary data https://dx.doi.org/10.1016/j.gca.2016.09.016 The specific ingrowth rates of different radium isotopes make them valuable tracers to distinguish processes occurring at different temporal scales. Here we demonstrate the use of the radium quartet (Ra, Ra, Ra and Ra) to differentiate flows of submarine groundwater discharge and porewater exchange to a coastal embayment (Alfacs Bay, NW Mediterranean Sea), based on the assumption that these processes occur on different time scales. In order to evaluate the seasonal dynamics of groundwater and porewater inputs to the bay, we conducted three seasonal samplings at Alfacs Bay, during which samples for Ra isotopes were collected from bay waters, groundwater springs, porewaters and irrigation channels. Activities of short-lived Ra isotopes in the bay showed a strong seasonality, (e.g. average Ra activities in summer (∼32 dpm 100 L) up to 4 times higher than in winter (∼8 dpm 100 L)). In contrast, the activities of the long-lived Ra isotopes were fairly constant throughout the year (e.g. activities of Ra were ∼16 and ∼14 dpm 100 L in summer and winter, respectively). The relatively short exposure to sediments of recirculation fluxes resulted in porewaters significantly enriched in short-lived Ra isotopes relative to the long-lived ones (e.g. Ra = 1100–1300 dpm 100 L; Ra = 17–99 dpm 100 L), whereas coastal groundwaters were enriched in all the Ra isotopes (e.g. Ra = 120–150 dpm 100 L; Ra = 200–400 dpm 100 L). The distinct signatures of different sources allowed us to construct seasonal Ra mass balances to estimate both groundwater discharge, which ranges from (40 ± 60)·10 m·d in summer to (310 ± 200)·10 m·d in winter, and porewater exchange fluxes, ranging from (1200 ± 120)·10 m·d in summer to (270 ± 40)·10 m·d in winter. Whereas the seasonal variability of groundwater inputs is likely governed by the terrestrial hydraulic gradient, a qualitative evaluation of the drivers of porewater exchange suggested that the strong seasonality of the seawater recirculation inputs is likely mediated by seasonal cycles on the activity of benthic infauna. Ra isotopes are thus valuable tracers to differentiate fluxes of both submarine groundwater discharge and porewater exchange, allowing a more accurate evaluation of the fluxes of freshwater and solutes to coastal ecosystems, as well as their implications for coastal biogeochemical cycles This project has been partially funded by the Spanish Government (MINECO) through the project ECOALFACS (CTM2009-09581), endorsed to the international programme GEOHAB (Global Ecology and Oceanography of Harmful Algal Blooms; SCOR and IOC/UNESCO). V.R. acknowledges financial support through a PhD fellowship (AP2008-03044) from the Spanish Government and from the European Union’s FP7 (Marie Curie Actions PCOFUND-GA-2013-609102), through the PRESTIGE programme coordinated by Campus France. Support for a PhD fellowship to G.T. from the European Union’s FP7 (Marie Curie Actions METTRANS-ITN-290336) is also acknowledged. Authors want to thank the support of the Generalitat de Catalunya to MERS (2014 SGR-1356). This research is a contribution to the ANR @RAction chair (ANR-14-ACHN-0007-01) and Labex OT-Med (ANR-11-LABEX-0061) funded by the “Investissements d’Avenir” program through the A∗MIDEX project (ANR-11-IDEX-0001-02) of the French National Research Agency (ANR) Peer Reviewed 2017-04-07T07:05:16Z 2017-04-07T07:05:16Z 2017-01 2017-04-07T07:05:16Z artículo http://purl.org/coar/resource_type/c_6501 issn: 0016-7037 Geochimica et Cosmochimica Acta 196: 58-73 (2017) http://hdl.handle.net/10261/148090 10.1016/j.gca.2016.09.016 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/100005243 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/501100001665 https://dx.doi.org/10.1016/j.gca.2016.09.016 Sí none Meteoritical Society |