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- Title
Assessment of methane emissions from a dairy farm using an inverse dispersion technique.
- Authors
Bühler, Marcel; Häni, Christoph; Kupper, Thomas; Schrade, Sabine; Zähner, Michael; Wyss, Simon A.; Mohn, Joachim; Ammann, Christof; Brönnimann, Stefan
- Abstract
Quantification of gaseous emissions from diffuse sources, for instance from animal and wasteoperations (AWO) are challenging, e.g. due to their heterogeneity in space and time. Inversedispersion techniques are a promising option and are becoming more important indetermining gaseous emissions from AWO as it is a low-cost and flexible to use method. Onepossible approach is to use a simple backward Lagrangian stochastic (bLS) model (Häni etal., 2018). To apply this model, a horizontal flat and homogeneous surrounding without anynearby sources is presupposed. However, these criteria are often not fulfilled. In the presentedstudy, the applicability of the bLS model was tested under non-ideal model conditions onmethane (CH4) emissions of a natural ventilated dairy housing with 40 cows in Switzerland.For the up- and downwind CH4 concentration measurements, open-path tuneablediode laser spectrometers (GasFinder3.0, Boreal Laser, Inc., Edmonton, Alberta,Canada) were used. Data was collected during 30 days in autumn and 20 days inwinter 2018. Results for the autumn and winter campaign were compared withsimultaneous in-house CH4 emission measurements conducted with a tracer ratiomethod. The tracer ratio technique is well-established to quantify diffuse emissionsand has shown high accuracy in an extended validation study (Mohn et al., 2018).Therefore, this campaign provides the unique opportunity to compare temporaltrends of CH4 emissions and interpret bLS results with respect to non-ideal modelconditions. Literature cited: Häni, C., Flechard, C., Neftel, A., Sintermann, J., Kupper, T. 2018. Accounting forfield-scale dry deposition in backward Lagrangian Stochastic dispersion modelling of NH3emissions. Atmosphere 9(4). Mohn, J., Zeyer, K., Keck, M., Keller, M., Zähner, M., Poteko, J., Emmenegger, L.,Schrade, S. 2018. A dual tracer ratio method for comparative emission measurements in anexperimental dairy housing. Atmos. Environ. 179: 12-22.
- Subjects
EDMONTON (Alta.); DAIRY farming; METHANE; DISPERSION (Chemistry); COMPARATIVE method; SPECTROMETERS; DAIRY machinery
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article