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| Titel |
Determination of field scale ammonia emissions for common slurry spreading practice with two independent methods |
| VerfasserIn |
J. Sintermann, C. Ammann, U. Kuhn, C. Spirig, R. Hirschberger, A. Gärtner, A. Neftel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 9 ; Nr. 4, no. 9 (2011-09-09), S.1821-1840 |
| Datensatznummer |
250002092
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| Publikation (Nr.) |
 copernicus.org/amt-4-1821-2011.pdf |
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| Zusammenfassung |
| At a cropland and a grassland site field scale ammonia (NH3) emissions
from slurry application were determined simultaneously by two approaches
based on (i) eddy covariance (EC) flux measurements using high temperature
Chemical Ionisation Mass Spectrometry (HT-CIMS) and on (ii) backward
Lagrangian Stochastic (bLS) dispersion modelling using concentration
measurements by three optical open path Fourier Transform Infrared (FTIR)
systems. Slurry was spread on the fields in sequential tracks over a period
of one to two hours. In order to calculate field emissions, measured
EC/HT-CIMS fluxes were combined with flux footprint analysis of individual
slurry spreading tracks to parameterise the NH3 volatilisation with a
bi-exponential time dependence. Accordingly, track-resolved concentration
footprints for the FTIR measurements were calculated using bLS. A consistency
test with concentrations measured by impingers showed very low systematic
deviations for the EC/HT-CIMS results (<8%) but larger deviations for
the bLS/FTIR results. For both slurry application events, the
period during fertilisation and the subsequent two hours contributed by more
than 80% to the total field emissions. Averaged over the two measurement
methods, the cumulated emissions of the first day amounted to
17 ± 3% loss of applied total ammoniacal nitrogen over the cropland
and 16 ± 3% over the grassland field. |
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