Contribution of Groundwater Discharge to the Coastal Dissolved Nutrients and Trace Metal Concentrations in Majorca Island: Karstic vs Detrital Systems

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• 作者：Antonio Tovar-S谩nchez ; Gotzon Basterretxea ; Valent铆 Rodellas ; David S谩nchez-Quiles ; Jordi Garc铆a-Orellana ; Pere Masqu茅 ; Antoni Jordi ; Jos茅 M. L贸pez ; Ester Garcia-Solsona
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：October 21, 2014
• 年：2014
• 卷：48
• 期：20
• 页码：11819-11827
• 全文大小：427K
• ISSN：1520-5851

文摘

Submarine groundwater discharge (SGD) and derived nutrient (NO₂^{鈥?/sup>, NO₃鈥?/sup>, NH₄+, PO₄3鈥?/sup>, and SiO₂) and trace element (Cd, Co, Cu, Fe, Mo, Ni, Pb, V and Zn) loadings to the coastal sea were systematically assessed along the coast of Majorca Island, Spain, in a general survey around the island and in three representative coves during 2010. We estimated that brackish water discharges through the shoreline are important contributors to the DIN, SiO₂, Fe, and Zn budgets of the nearshore waters. Furthermore, our results showed that SGD-derived elements are conditioned by the hydrogeological formations of the aquifer and discharge type. Thus, while rapid discharges through karstic conduits are enriched in SiO₂ and Zn, the large detrital aquifers of the island typically present enhanced concentrations of Fe. The estimated total annual inputs of chemicals constituents discharged by SGD to the coastal waters were as follows: DIN: 610 脳 103 kg yr鈥?, SiO₂: 1400 脳 103 kg yr鈥?, Fe: 3.2 脳 103 kg yr鈥?, and Zn: 2.0 脳 103 kg yr鈥?. Our results provide evidence that SGD is a major contributor to the dissolved pool of inorganic nutrients and trace metals in the nearshore waters of Majorca.}