Electrical Resistivity Anomalies Offshore a Carbonate Coastline: Evidence for Freshened Groundwater?

Amir Haroon, Aaron Micallef, Marion Jegen, Katrin Schwalenberg, Jens Karstens, Christian Berndt, Xavier Garcia, Michel Kühn, Enzo Rizzo, Nicoletta Chiara Fusi, Chibuzo Valeria Ahaneku, Lorenzo Petronio (+4 others)
2021 Geophysical Research Letters  
Groundwater resources in coastal regions are globally deteriorating due to population growth, pollution, and climate change (Aeshbach-Hertig & Gleeson, 2012; Michael et al., 2017; Richey et al., 2015) . Problems are especially critical in arid regions, where groundwater is often the only source of freshwater, and where periods of highest consumption coincide with periods of lowest meteoric recharge. To mitigate the increasing demand on groundwater systems, offshore freshened groundwater (OFG)
more » ... s been proposed as an alternative source of potable water (Bakken et al., 2012) . The key emplacement mechanisms for OFG include present-day meteoric recharge from the onshore portion of the aquifer (Michael et al., 2016; Paldor et al., 2020) and/or meteoric recharge of shelf areas that were exposed during sea-level lowstands (Meisler et al., 1984) . In the case of the latter, emplaced groundwater migrated landwards more slowly than the ensuing sea-level rise, and remnants of these groundwater bodies are still found offshore (Cronin, 2012; Harrar et al., 2001; Person et al., 2003; Post et al., 2013) . OFG systems today are either recharging through an active connection to their terrestrial counterparts, or disconnected, relict systems. In both cases, the
doi:10.1029/2020gl091909 fatcat:khfyodiidfepzgezwzwoizak5y