Thermo-Haline Circulation in Confined Coastal Aquifers and Resulting Deep Submarine Groundwater Discharge

Paldor, Anner; Aharonov, Einat; Katz, Oded

doi:10.1130/abs/2018am-319943

Cited by 1 publication

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“…The oceanographic observations conducted in the potential discharge zone and presented here include repeated salinity and temperature water column profiles along the main thalweg of the canyon and several measurements of the short‐lived radionuclide, 224 Ra. The observations are consistent with outflow of pore waters from the potential discharge zone and thus support the simulation results of our hydrologic model (Paldor, Aharonov, et al, ).…”

Section: Introductionsupporting

confidence: 91%

“…Gustafson et al () suggested that terrestrial recharge is feeding the vast fresh groundwater reservoir they identified to extend tens of kilometers into the Atlantic Ocean, and groundwater flows to the sea through a confined aquifer with special geologic structures. Similarly, using a recently constructed hydrogeological model, Paldor, Aharonov, et al () simulated a steady‐state DSGD at a depth of several hundred meters and a distance of ~10 km offshore. The Paldor, Aharonov, et al () model was run for a case of a seaward sloping confined aquifer of the Judea Group, at a section offshore western Galilee, northern Israel, a location where the aquifer rocks are exposed by the Achziv Submarine Canyon (Figure ).…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, using a recently constructed hydrogeological model, Paldor, Aharonov, et al () simulated a steady‐state DSGD at a depth of several hundred meters and a distance of ~10 km offshore. The Paldor, Aharonov, et al () model was run for a case of a seaward sloping confined aquifer of the Judea Group, at a section offshore western Galilee, northern Israel, a location where the aquifer rocks are exposed by the Achziv Submarine Canyon (Figure ). Paldor, Aharonov, et al () computationally demonstrated the feasibility of a steady‐state DSGD from the exposure area within the submarine canyon.…”

Section: Introductionmentioning

confidence: 99%

“…The Paldor, Aharonov, et al () model was run for a case of a seaward sloping confined aquifer of the Judea Group, at a section offshore western Galilee, northern Israel, a location where the aquifer rocks are exposed by the Achziv Submarine Canyon (Figure ). Paldor, Aharonov, et al () computationally demonstrated the feasibility of a steady‐state DSGD from the exposure area within the submarine canyon. The present study aims to corroborate the model predictions by providing geological, geophysical, and oceanographic evidence for the existence of DSGD at the Achziv Submarine Canyon.…”

Section: Introductionmentioning

confidence: 99%

“…The study was based on the assumption that δ 18 O of the DSGD is a mixture of two distinct end‐members, terrestrial water with low δ 18 O and seawater with higher δ 18 O . However, the modeling work by Paldor, Aharonov, et al () predicted that in the case of the Achziv Submarine Canyon, the freshwater fraction in the DSGD is extremely small (a factor smaller than 1/500 of the DSGD), much smaller than the sensitivity of the available δ 18 O methods. This calls for a more sensitive method for tracing low‐salinity seepage in the deep sea.…”

Section: Introductionmentioning

confidence: 99%

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Deep Submarine Groundwater Discharge—Evidence From Achziv Submarine Canyon at the Exposure of the Judea Group Confined Aquifer, Eastern Mediterranean

et al. 2020

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Deep submarine groundwater discharge (DSGD) of fresh-brackish water was suggested to occur globally, yet its driving mechanism is not well constrained. Specifically, it is unclear whether the phenomenon may represent a steady-state condition of a hydrological system, in which the terrestrial recharge area is hydraulically connected with the submarine discharge area (by a confined aquifer, for example). Recently, our hydrogeological modeling suggested that such a system exists in northern Israel. The model predicted the location of a brackish water seepage within the Achziv Submarine Canyon,~10 km offshore, where the Cretaceous Judea Group confined aquifer is carved by the canyon. The present work is a field study that attempts to identify these brackish seeps in the water column of the canyon at the aquifer exposure. The field observations include salinity and temperature profiling of the water column along the canyon during three cruises and 224 Ra measurements of water samples from the canyon. The results point to a significant near-bottom low-salinity and low-temperature anomaly right where the aquifer submarine outcrop is mapped that coincide with a high 224 Ra activity anomaly. Such near-bottom anomalies are absent in an adjacent submarine canyon, in which the confined aquifer is not exposed. The anomalies in the water column of the Achziv Submarine Canyon corroborate the results of the hydrogeological modeling that predicted brackish DSGD from the sea bottom at the aquifer outcrop. The possibility of DSGD in specific geo-hydrological settings is relevant for various biological, geochemical, hydrological, and geotechnical studies of the marginal ocean.

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Section: Introductionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%