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Radiocarbon in Seawater Intruding into the Israeli Mediterranean Coastal Aquifer

Published online by Cambridge University Press:  18 July 2016

Y Yechieli ,
O Sivan ,
B Lazar ,
A Vengosh ,
D Ronen  and
B Herut
Y Yechieli*
Affiliation:
Geological Survey of Israel, 30 Malkhei Israel Street, Jerusalem 95501, Israel
O Sivan
Affiliation:
Geological Survey of Israel, 30 Malkhei Israel Street, Jerusalem 95501, Israel Institute of Earth Sciences, Hebrew University, Jerusalem 91904, Israel
B Lazar
Affiliation:
Institute of Earth Sciences, Hebrew University, Jerusalem 91904, Israel The Moshe Shilo Minerva Center for Marine Biogeochemistry, Hebrew University, Jerusalem 91904, Israel
A Vengosh
Affiliation:
Ben-Gurion University, Beer-Sheva, Israel
D Ronen
Affiliation:
Hydrological Service, Jerusalem 91063, Israel
B Herut
Affiliation:
Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa 31080, Israel
*
Corresponding author. Email: yechieli@mail.gsi.gov.il.
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Abstract

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Saline groundwaters from the Israeli coastal aquifer were analyzed for their radiocarbon and tritium content to assess the rate of seawater penetration. The low 14C values (28–88 pMC versus 100–117 pMC in seawater) imply an apparent non-recent seawater source, or water-rock interactions along the penetration route. The latter process is supported by measurable tritium values at some locations, which imply a relatively rapid rate of seawater intrusion. In other locations, low tritium values (<2 T.U.) indicate that recent seawater (<50 yr) did not penetrate inland. The low δ13C values in saline groundwater (average of −5.3‰ versus 0‰ in seawater) indicate that the dissolved carbon pool is comprised of a significant fraction of organic carbon. A linear negative correlation between δ13C and 14C implies that this organic source is old (low 14C values).

Type
II. Our ‘Wet’ Environment
Information
Radiocarbon , Volume 43 , Issue 2B: Proceedings of the 17th International Radiocarbon Conference (Part 2 of 3), Conference Editors: Israel Carmi, Elisabetta Boaretto , 2001 , pp. 773 - 781
Copyright
Copyright © 2001 by the Arizona Board of Regents on behalf of the University of Arizona 

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