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| Titel |
Groundwater and nutrient discharge through karstic coastal springs (Castelló, Spain) |
| VerfasserIn |
E. Garcia-Solsona, J. Garcia-Orellana, P. Masqué, V. Rodellas, M. Mejias, B. Ballesteros, J. A. Domínguez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 9 ; Nr. 7, no. 9 (2010-09-07), S.2625-2638 |
| Datensatznummer |
250004962
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| Publikation (Nr.) |
 copernicus.org/bg-7-2625-2010.pdf |
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| Zusammenfassung |
| Discharge of groundwater and associated chemical compounds into coastal
karstic regions, which are abundant in the Mediterranean basin, is envisaged
to be significant. In this study, we evaluate the groundwater discharge and
its nutrient load to the open karstic site of Badum (Castelló, East Spain). Salinity
profiles evidenced that groundwater discharge from coastal brackish springs
causes a buoyant fresher layer, as identified with thermal infrared images.
Chemical tracers (radium isotopes, dissolved inorganic silicate and seawater
major elements) have been used to determine a brackish groundwater
proportion in coastal waters of 36% in October 2006 and 44% in June
2007. Based on a radium-derived residence time of 2.7 days in October 2006
and 2.0 days in June 2007, total SGD fluxes have been estimated in 71 500
and 187 000 m3 d−1, respectively, with fresh-SGD
contributions representing 71% and 85%. The calculated SGD-associated
nutrient fluxes, most likely of natural origin, were 1500 and
8300 μmol m−2 d−1 of DIN and 19 and 40 μmol m−2 d−1 of DIP in October 2006 and June 2007,
respectively. These inputs may actually lead to or enhance P limitation,
thereby altering the structure of biological communities in the area. |
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