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| Titel |
Estimation of NH3 emissions from a naturally ventilated livestock farm using local-scale atmospheric dispersion modelling |
| VerfasserIn |
A. Hensen, B. Loubet, J. Mosquera, W. C. M. Bulk, J. W. Erisman, U. Dämmgen, C. Milford, F. J. Löpmeier, P. Cellier, P. Mikuška, M. A. Sutton |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 12 ; Nr. 6, no. 12 (2009-12-04), S.2847-2860 |
| Datensatznummer |
250004217
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| Publikation (Nr.) |
 copernicus.org/bg-6-2847-2009.pdf |
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| Zusammenfassung |
| Agricultural livestock represents the main source of ammonia (NH3) in
Europe. In recent years, reduction policies have been applied to reduce
NH3 emissions. In order to estimate the impacts of these policies,
robust estimates of the emissions from the main sources, i.e. livestock
farms are needed. In this paper, the NH3 emissions were estimated from
a naturally ventilated livestock farm in Braunschweig, Germany during a
joint field experiment of the GRAMINAE European project. An inference method
was used with a Gaussian-3D plume model and with the Huang 3-D model.
NH3 concentrations downwind of the source were used together with
micrometeorological data to estimate the source strength over time. Mobile
NH3 concentration measurements provided information on the spatial
distribution of source strength. The estimated emission strength ranged
between 6.4±0.18 kg NH3 d−1 (Huang 3-D model) and 9.2±0.7 kg
NH3 d−1 (Gaussian-3D model). These estimates were 94%
and 63% of what was obtained using emission factors from the German
national inventory (9.6 kg d−1 NH3). The effect of deposition was
evaluated with the FIDES-2D model. This increased the emission estimate to
11.7 kg NH3 d−1, showing that deposition can explain the observed
difference. The daily pattern of the source was correlated with net
radiation and with the temperature inside the animal houses. The daily
pattern resulted from a combination of a temperature effect on the source
concentration together with an effect of variations in free and forced
convection of the building ventilation rate. Further development of the
plume technique is especially relevant for naturally ventilated farms, since
the variable ventilation rate makes other emission measurements difficult. |
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