Dynamics of nitrous oxide with depth in groundwater: Insights from ambient groundwater and laboratory incubation experiments (Hesbaye chalk aquifer, Belgium)
| Autor: | Cédric Morana, Maxime Duvivier, Philippe Orban, Anna Jurado, Serge Brouyѐre, Tanguy Robert, Pascal Goderniaux, Alberto Borges, Olha Nikolenko |
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| Přispěvatelé: | European Commission |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Denitrification
Nitrous Oxide 0207 environmental engineering Aquifer Soil science 02 engineering and technology 010501 environmental sciences 01 natural sciences Low-flow sampling Calcium Carbonate chemistry.chemical_compound Belgium TRACER Environmental Chemistry 020701 environmental engineering Groundwater 0105 earth and related environmental sciences Water Science and Technology geography geography.geographical_feature_category Stable isotope ratio Nitrous oxide N stable isotope analysis Nitrification 6. Clean water Greenhouse gases chemistry 13. Climate action Greenhouse gas Environmental science Laboratories |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Aquifers under agricultural areas are considered to be an indirect source of nitrous oxide emission (N2O) to the atmosphere, which is the greenhouse gas (GHGs) characterized with the highest global warning potential and acts as a stratospheric ozone depletion agent. Previous investigations performed in the Cretaceous Hesbaye chalk aquifer in Eastern Belgium suggested that the dynamics of N2O in the aquifer is controlled by overlapping biochemical processes such as nitrification and denitrification. The current study aims to obtain better insight concerning the factors controlling the distribution of N2O concentration along a vertical dimension in the aquifer, and to capture and quantify the occurrence of nitrification and denitrification processes in the groundwater system. Low-flow groundwater sampling technique was undertaken at different depths in the aquifer to collect groundwater samples aiming at obtaining information about ambient aquifer hydrogeochemical conditions and their effect on the accumulation of GHGs. Afterwards, laboratory stable isotope experiments, using NO3- and NH4+ compounds labeled with heavy 15N isotope, were applied to quantify the rates of nitrification and denitrification processes. Ambient studies suggest that the occurrence of N transformation was related to denitrification while laboratory incubation experiments did not detect it. Such controversial results might be explained by the discrepancy between real aquifer conditions and lab design studies. Thus, additional in situ tracer experiments should be carried out in areas where natural groundwater fluxes do not flush the injected tracer too rapidly. In addition, it would be useful to conduct microbiological studies to obtain better insight into the nature of subsurface biofilm biotope. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 675120. Los Gatos Research OA-ICOS was funded by the Fonds National de la Rechecherche Scientifique (FNRS) (22547486). AVB is a Research Director at the FNRS. |
| Databáze: | OpenAIRE |
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