Ideas and perspectives: Land-ocean connectivity through groundwater.

Arevalo-Martinez, Damian Leonardo , Haroon, Amir , Bange, Hermann , Erkul, Ercan, Jegen, Marion , Moosdorf, Nils, Schneider von Deimling, Jens, Berndt, Christian , Böttcher, Michael Ernst, Hoffmann, Jasper, Liebetrau, Volker, Mallast, Ulf, Massmann, Gudrun, Micallef, Aaron , Michael, Holly A., Paasche, Hendrik, Rabbel, Wolfgang, Santos, Isaac, Scholten, Jan, Schwalenberg, Katrin, Szymczycha, Beata, Thomas, Ariel T., Virtasalo, Joonas J., Waska, Hannelore and Weymer, Bradley (2023) Ideas and perspectives: Land-ocean connectivity through groundwater. Open Access Biogeosciences (BG), 20 . pp. 647-662. DOI 10.5194/bg-20-647-2023.

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Abstract

For millennia, humans have gravitated towards coastlines for their resource potential and as geopolitical centres for global trade. A basic requirement ensuring water security for coastal communities relies on a delicate balance between the supply and demand of potable water. The interaction between freshwater and saltwater in coastal settings is, therefore, complicated by both natural and human-driven environmental changes at the land-sea interface. In particular, ongoing sea level rise, warming and deoxygenation might exacerbate such perturbations. In this context, an improved understanding of the nature and variability of groundwater fluxes across the land-sea continuum is timely, yet remains out of reach. The flow of terrestrial groundwater across the coastal transition zone as well as the extent of freshened groundwater below the present-day seafloor are receiving increased attention in marine and coastal sciences because they likely represent a significant, yet highly uncertain component of (bio)geochemical budgets, and because of the emerging interest in the potential use of offshore freshened groundwater as a resource. At the same time, “reverse” groundwater flux from offshore to onshore is of prevalent socio-economic interest as terrestrial groundwater resources are continuously pressured by overpumping and seawater intrusion in many coastal regions worldwide. An accurate assessment of the land-ocean connectivity through groundwater and its potential responses to future anthropogenic activities and climate change will require a multidisciplinary approach combining the expertise of geophysicists, hydrogeologists, (bio)geochemists and modellers. Such joint activities will lay the scientific basis for better understanding the role of groundwater in societal-relevant issues such as climate change, pollution and the environmental status of the coastal oceans within the framework of the United Nations Sustainable Development Goals. Here, we present our perspectives on future research directions to better understand land-ocean connectivity through groundwater, including the spatial distributions of the essential hydrogeological parameters, highlighting technical and scientific developments, and briefly discussing its societal relevance in rapidly changing coastal oceans.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/H2020/677898; DFG: MA7041/6-1
Keywords: Land-Ocean connectivity, groundwater
Research affiliation: HGF-UFZ
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
IOW
HGF-AWI
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Kiel University
Main POF Topic: PT8: Georesources
Refereed: Yes
Open Access Journal?: Yes
Publisher: Copernicus Publications (EGU)
Related URLs:
Projects: Baltic TRANSCOAST, KiSNet Network, MARCAN, Future Ocean, SMART, DynaDeep
Date Deposited: 13 Jul 2022 12:00
Last Modified: 07 Feb 2024 15:35
URI: https://oceanrep.geomar.de/id/eprint/56562

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