The Importance of Submarine Groundwater Discharge to the Nearshore Nutrient Supply in the Gulf of Aqaba (Israel)

We used two short-lived radium isotopes ($^{223}Ra$, 224Ra) and a mass balance approach applied to the radium activities to determine the nutrient contribution of saline submarine groundwater discharge to the coastal waters of the northern Gulf of Aqaba (Israel). Radium isotope activities were measu...

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Veröffentlicht in:Limnology and oceanography 2006-07, Vol.51 (4), p.1876-1886
Hauptverfasser: Shellenbarger, Gregory G., Monismith, Stephen G., Genin, Amatzia, Paytan, Adina
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container_end_page 1886
container_issue 4
container_start_page 1876
container_title Limnology and oceanography
container_volume 51
creator Shellenbarger, Gregory G.
Monismith, Stephen G.
Genin, Amatzia
Paytan, Adina
description We used two short-lived radium isotopes ($^{223}Ra$, 224Ra) and a mass balance approach applied to the radium activities to determine the nutrient contribution of saline submarine groundwater discharge to the coastal waters of the northern Gulf of Aqaba (Israel). Radium isotope activities were measured along transects during two seasons at a site that lacked any obvious surficial water input. An onshore well and an offshore end member were also sampled. For all samples, nutrients and salinity data were collected. Radium isotope activities generally decreased with distance offshore and exhibited significant tidal variability, which is consistent with a shore-derived tidally influenced source. Submarine groundwater contributes only 1-2% of the water along this coast, but this groundwater provides 8-46% of the nutrients. This saline groundwater is derived predominately from tidally pumped seawater percolating through the unconfined coastal aquifer and leaching radium and nutrients. This process represents a significant source of nutrients to the oligotrophic nearshore reef.
doi_str_mv 10.4319/lo.2006.51.4.1876
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source Wiley Online Library website; Wiley Online Library (Online service); Alma/SFX Local Collection; JSTOR; EZB Electronic Journals Library
subjects Animal and plant ecology
Animal, plant and microbial ecology
Arithmetic mean
Beaches
Biological and medical sciences
Coastal water
Coral reefs
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Groundwater
Gulfs
Hydrogeology
Hydrology. Hydrogeology
Isotope geochemistry
Isotope geochemistry. Geochronology
Moorings
Radium
Radium isotopes
Sea water
Sea water ecosystems
Synecology
title The Importance of Submarine Groundwater Discharge to the Nearshore Nutrient Supply in the Gulf of Aqaba (Israel)
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