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Qian, Chang ; Wang, Qianqian ; Gilfedder, Benjamin Silas ; Frei, Sven ; Yu, Jieyu ; Kattel, Giri R. ; Yu, Zhi-Guo:
Seasonal Dynamics of Groundwater Discharge : Unveiling the Complex Control Over Reservoir Greenhouse Gas Emissions.
In: Water Research.
Bd. 269
(2025)
.
- 122801.
ISSN 0043-1354
DOI: https://doi.org/10.1016/j.watres.2024.122801
Abstract
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. Based on the radon (222Rn) mass balance model, groundwater discharge rates were estimated to be 2.14 ± 0.49 cm d−1 in autumn, 4.04 ± 2.09 cm d−1 in winter, 2.55 ± 1.32 cm d−1 in spring, and 2.61 ± 1.93 cm d−1 in summer. Groundwater discharge contributes on average to 31.23 % of CH4, 35.65 % of CO2, and 11.26 % of N2O emissions across all seasons in the reservoir. Groundwater primarily influences GHG emissions by directly inputting carbon and nitrogen, as well as by altering aquatic chemical conditions and the environment of dissolved organic matter (DOM), exerting significant effects particularly during spring and autumn seasons. Especially, in winter, higher groundwater discharge rates influence microbial activity and environmental conditions in the water body, including the C/N ratio, which somewhat reduces its enhancement of greenhouse gas emissions. This study provides an in-depth exploration of greenhouse gas emissions from reservoirs and examines the impact of groundwater on these emissions, aiming to reduce uncertainties in understanding greenhouse gas emission mechanisms and carbon and nitrogen cycling.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | Groundwater discharge; Greenhouse gases; Radon; Reservoir; Dissolved organic matter (DOM); C/N ratio |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Hydrologie > Lehrstuhl Hydrologie - Univ.-Prof. Dr. Stefan Peiffer |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie |
| Eingestellt am: | 21 Nov 2024 06:10 |
| Letzte Änderung: | 21 Nov 2024 06:10 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/91222 |