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Groundwater releases CO to diverse global coastal ecosystems.
Sci Adv
January 2025
Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden.
Coastal ecosystems play a major role in marine carbon budgets, but substantial uncertainties remain in the sources and fluxes of coastal carbon dioxide (CO). Here, we assess when, where, and how submarine groundwater discharge (SGD) releases CO to shallow coastal ecosystems. Time-series observations of dissolved CO and radon (Rn, a natural groundwater tracer) across 40 coastal systems from 14 countries revealed large SGD-derived CO fluxes.
View Article and Find Full Text PDFIntegrated environmental and health assessment from hydrogeochemistry and radiogeology parameters of hydrothermal spring attractions in Southern Thailand.
Environ Geochem Health
January 2025
Nuclear Technology Research and Development Center, Thailand Institute of Nuclear Technology, Nakhon Nayok, 26120, Thailand.
The present study aimed to investigate the hydrogeochemical patterns and contamination of the radiogeology, especially radon activity, related to geothermal aquifer properties and to perform a risk assessment of annual effective doses covering all hydrothermal spring attractions in Southern Thailand. Radon is an established lung carcinogen; especially longer term exposure to radioactive radon through inhalation could be a cause of lung cancer risk. Altogether 22 hydrothermal spring samples were collected from the six hydrothermal provinces in Southern Thailand in early November of 2023.
View Article and Find Full Text PDFModelling soil - Vegetation - Atmospheric interactions of radon products in a Belgian Scots pine forest site.
J Environ Radioact
December 2024
Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, 2400, Mol, Belgium.
A soil-vegetation-atmospheric transfer (SVAT) model for radon and its progeny is presented to improve process-level understanding of the role of forests in taking-up radionuclides from soil radon outgassing. A dynamic system of differential equations couples soil, tree (Scots pine) and atmospheric processes, treating the trees as sources, sinks and conduits between the atmosphere and the soil. The model's compartments include a dual-layer soil column undergoing hydrological and solute transport, the tree system (comprising roots, wood, litter, and foliage) and the atmosphere, with physical processes governing the transfers of water and radon products between these compartments.
View Article and Find Full Text PDFNatural radon levels act as markers of hydrodynamic behavior in the mountain karst aquifer of Bossea Cave, Italy.
Sci Rep
November 2024
Department of Environment, Land and Infrastructure Engineering (DIATI), Politecnico di Torino, Turin, Italy.
Article Synopsis
- - Radon is transported within the Bossea karstic mountain aquifer through both advective and diffusive processes, with fluctuations correlating to hydrodynamics rather than external weather factors.
- - Delayed concentration peaks of radon in underground water occur after flooding, with a 45-hour delay in the upper canyon and 66 hours in collapse chambers due to varying water flow dynamics.
- - Different radon levels are detected in the main creek compared to secondary inflows; the main creek experiences increases during flooding, while secondary inflows see dilution from new infiltrating water, with no significant relationship found between radon emissions and seismic activity.
Seasonal dynamics of groundwater discharge: Unveiling the complex control over reservoir greenhouse gas emissions.
Water Res
February 2025
Key Laboratory Carbon Source and Sink-China of Ecosystem Meteorological Administration (ECSS-CMA)/School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing, China. Electronic address:
The pronounced topographical differences, giving rise to numerous water bodies, also endow these formations with substantial hydraulic gradients, leading to pronounced groundwater discharge within their low-lying, natural reservoir settings. However, the dynamics of groundwater discharge in reservoirs and their impact on greenhouse gas (GHG) production and emission under different conditions remain unclear. This study focuses on a reservoir in southeastern China, where we conducted seasonal field observations alongside microcosm incubation experiments to elucidate the relationship between greenhouse gas emissions and groundwater discharge.
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