Dynamics of greenhouse gases in groundwater: hydrogeological and hydrogeochemical controls

[en] In this study the variability of greenhouse gases (GHGs) concentrations along lateral and vertical dimensions of the chalk aquifer located in the eastern part of Belgium was examined in order to understand its dependence on hydrogeological and hydrogeochemical conditions. Groundwater samples from 29 wells/piezometers were analyzed for concentrations of nitrous oxide (N2O), carbon dioxide (CO2), methane (CH4), major and minor elements and stable isotopes of nitrate (NO3−), nitrous oxide (N2O), sulfate (SO42−) and boron (B). For lateral investigations, four zones with different environmental settings were identified (southern, central, north-eastern and northern). Groundwater was oversaturated with GHGs with respect to its equilibrium concentrations with the atmosphere in all zones, except the northern one, undersaturated in N2O (0.07 ± 0.08 μgN/L vs. 0.3 μgN/L). Vertical dimension studies showed the decrease in CO2 concentration and significant changes in both isotope signatures and concentration of N2O with depth. The production of N2O could be attributed to a combination of nitrification and denitrification processes occurring at different depths. CO2 concentration is controlled by the process of dissolution of carbonate minerals which constitute aquifer geology. CH4 is produced due to methanogenesis in deeper parts of the aquifer, though its thermogenic origin is also possible. Differences in hydrogeochemical settings and changing intensity of biogeochemical processes across the area and with depth have considerable effect on GHGs concentrations. Thus, before estimating GHGs fluxes at the groundwater–river interface insights obtained from larger-scale investigations are required in order to identify the representative spatial zones which govern GHGs emissions.

Disciplines :

Geological, petroleum & mining engineering
Earth sciences & physical geography

Author, co-author :

Nikolenko, Olha ; Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement

Orban, Philippe ; Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement

Jurado, Anna

Morana, Cédric ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO)

Jamin, Pierre ; Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement

Robert, Tanguy ; Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement

Knöller, Kay

Borges, Alberto ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO)

Brouyère, Serge ; Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement

Language :

English

Title :

Dynamics of greenhouse gases in groundwater: hydrogeological and hydrogeochemical controls

Publication date :

2019

Journal title :

Applied Geochemistry

ISSN :

0883-2927

Publisher :

Elsevier, United Kingdom

Volume :

105

Pages :

31 - 44

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://www.sciencedirect.com/science/article/pii/S0883292719300964

European Projects :

H2020 - 642372 - INSPIRATION - INtegrated Spatial PlannIng, land use and soil management Research ActTION

Funders :

CE - Commission Européenne [BE]

Funding text :

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.

Available on ORBi :

since 24 April 2019

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