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| Titel |
Combining airborne thermal infrared images, radium isotopes and radon to study Submarine Groundwater Discharge along the French Mediterranean coastline (C\^{o}te Bleue)} |
| VerfasserIn |
Simon Bejannin, Joseph Tamborski, Marc Souhaut, Olivier Radakovitch, Christelle Claude, Thomas Stieglitz, Olivier Crispi, Mireille Pujo-Pay, Pascal Conan, Jocelyne Caparros, Lars-Eric Heimburger, Macha Petrova, Emilie Le Roy, François Lacan, Pieter van Beek |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250144591
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| Publikation (Nr.) |
 EGU/EGU2017-8436.pdf |
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| Zusammenfassung |
| Submarine Groundwater Discharge (SGD) is now recognized as an important vector for many
chemical elements that may impact the quality of the coastal environment and marine
ecosystems. Although these fluxes have been investigated in many places of the world, few
studies have been conducted along the French Mediterranean coastline. In this study, we
report airborne thermal infrared (TIR) images that allowed us to locate several freshwater
inputs along the “Côte Bleue” located west of the city of Marseille. We used salinity, radon
and radium isotopes to confirm that the TIR signal could be related to SGD. Radon was
analyzed in situ along the coastline on board a rubber boat. The four radium isotopes
(223Ra, 224Ra, 226Ra, 228Ra) were analyzed in samples collected in the coastal waters
characterized by a strong TIR signal, as well as along transects conducted on board RV
Antedon II between the coast and offshore (between 200 m and 8 km). We also
analyzed nutrient (nitrates, phosphates and silicates) and mercury concentrations in the
water samples. Radium isotopes were thus used to quantify SGD fluxes and to
determine the fluxes of nutrients and mercury associated with SGD along this coastline. |
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