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Geochemical tracers in submarine groundwater discharge research: practice and challenges from a view of climate changes.
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- Author(s): Jiang, Shan; Ibánhez, Juan Severino Pino; Wu, Ying; Zhang, Jing
- Source:
Environmental Reviews; 2021, Vol. 29 Issue 2, p242-259, 18p- Subject Terms:
- Source:
- Additional Information
- Abstract: Submarine groundwater discharge (SGD), the flux of porewater from permeable seabed or karst conduits to surface water bodies, delivers a significant quantity of land-borne solutes to coastal oceans. This input of land-derived solutes is frequently linked with eutrophication, harmful algae blooms, and benthic hypoxia, and hence has the potential to trigger great economic losses. Geophysical and geochemical tracers, including salinity, temperature, water stable isotopes, and radioactive elements, have been widely applied in SGD studies for more than 50 years to, amongst others, identify water sources, estimate residence times, and quantify discharge rates. Here we review advantages and shortcomings of these tracers in the study of SGD. Application requirements are outlined based on previous research and combined tracer approaches in karst environments, permeable coasts, and estuaries are illustrated under the view of climate changes. Current challenges with the use of geochemical tracers in SGD studies are highlighted and opportunities to develop these tracers for improved coastal management showcased. [ABSTRACT FROM AUTHOR]
- Abstract: La décharge d'eaux souterraines sous-marines, le flux d'eau interstitielle des fonds marins perméables ou des conduits karstiques vers les masses d'eau de surface, rejette une quantité importante de solutés terrestres aux océans côtiers. Cet apport de solutés d'origine terrestre est souvent lié à l'eutrophisation, à la prolifération d'algues nuisibles et à l'hypoxie benthique, et peut donc entraîner de grandes pertes économiques. Les traceurs géophysiques et géochimiques, notamment la salinité, la température, les isotopes stables et les éléments radioactifs de l'eau, ont été largement utilisés dans les études sur les décharges d'eaux souterraines sous-marines depuis plus de 50 ans afin, entre autres, d'identifier les sources d'eau, d'estimer les temps de séjour et de quantifier les taux de rejet. Les auteurs passent ici en revue les avantages et les inconvénients de ces traceurs dans l'étude des décharges d'eaux souterraines sous-marines. Les conditions d'application sont décrites sur la base de recherches antérieures et les approches de traceurs combinés dans les environnements karstiques, les côtes perméables et les estuaires sont illustrées sous l'angle des changements climatiques. Les défis actuels liés à l'utilisation des traceurs géochimiques dans les études des décharges d'eaux souterraines sous-marines sont mis en évidence et les possibilités de développer ces traceurs pour une meilleure gestion des côtes sont présentées. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Environmental Reviews is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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