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- Title
Emission of groundwater-derived nitrous oxide into the atmosphere: model simulations based on a.
- Authors
Böttcher, J.; Weymann, D.; Well, R.; Von Der Heide, C.; Schwen, A.; Flessa, H.; Duijnisveld, W. H. M.
- Abstract
Indirect emissions of the major greenhouse gas nitrous oxide (NO) occurring from aquatic ecosystems are considered to be a highly uncertain component in the global NO budget. In this study, we investigated the fate of NO produced by denitrification in a sandy shallow aquifer in northern Germany. The experimental data from a previous N field study and site-specific diffusion coefficients were used to simulate upward fluxes of groundwater-derived (N-)NO in the soil as well as its ultimate emission into the atmosphere. The one-dimensional simulation model considered gas diffusion and gas retardation by dissolution in the water phase. The modelled concentration gradients and emissions were in good agreement with the experimental data, indicating that diffusion was the dominant transport process in the soil, and that our model approach was thus suitable for simulating NO fluxes from the unsaturated zone to the atmosphere. Furthermore, the results revealed that there was no evidence for consumption of N-NO during upward diffusion from the surface groundwater to the atmosphere. Simulated concentrations and emissions of groundwater-derived NO were found to be very small and a negligible component of total NO.
- Subjects
GERMANY; GROUNDWATER; ATMOSPHERIC nitrous oxide; NITROGEN in water; EMISSIONS (Air pollution); FIELD research; DENITRIFICATION
- Publication
European Journal of Soil Science, 2011, Vol 62, Issue 2, p216
- ISSN
1351-0754
- Publication type
Article
- DOI
10.1111/j.1365-2389.2010.01311.x