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Updated: Jun 2, 2025

Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds
Published on: November 13, 2017
Hydroclimatic extremes threaten groundwater quality and stability
Simon A Schroeter1, Alice May Orme2, Katharina Lehmann3
1Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, Germany. simon.schroeter@bgc-jena.mpg.de.
Hydroclimatic extremes like drought increase groundwater vulnerability. Changes in dissolved organic matter reveal accelerated transport of surface molecules, potentially compromising drinking water quality.
Area of Science:
- Environmental Science
- Hydrogeology
- Organic Geochemistry
Background:
- Hydroclimatic extremes (heavy precipitation, drought) are increasing in frequency.
- These extremes impact groundwater recharge, quantity, and quality.
- Groundwater vulnerability to climate anomalies is not fully recognized.
Purpose of the Study:
- To investigate changes in groundwater dissolved organic matter (DOM) composition.
- To assess the impact of hydroclimatic extremes on groundwater quality.
- To identify DOM molecular composition as an indicator of groundwater quality deterioration.
Main Methods:
- Documented changes in groundwater DOM composition over the past decade.
- Analyzed the relationship between groundwater levels and DOM fractions.
- Observed molecular composition changes following an extreme drought event.
Main Results:
- Fractions of surface-derived organic molecules in groundwater increased significantly with declining groundwater levels.
- Concentrations of dissolved organic carbon remained constant.
- Molecular composition changeover accelerated after the 2018 extreme summer drought.
Conclusions:
- Hydroclimatic extremes facilitate rapid transport of surface-derived organic molecules to groundwater.
- Xenobiotic substances can evade microbial processing and accumulate in groundwater.
- Dissolved organic matter molecular composition serves as a comprehensive indicator for groundwater quality degradation.
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