Journal Article

PreJuSER-17084

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Determination of field scale ammonia emissions for common slurry spreading practice with two independent methods

Sintermann, J. ; Ammann, C. ; Kuhn, U.FZJ* ; Spirig, C. ; Hirschberger, R. ; Gärtner, A. ; Neftel, A.

2011
Copernicus Katlenburg-Lindau

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Please use a persistent id in citations: http://hdl.handle.net/2128/20742  doi:10.5194/amt-4-1821-2011

Abstract: 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.

Keyword(s): J

Note: For funding our work we gratefully thank the Swiss National Science Foundation (TERMS, 200021-117686/1) and the EU project NitroEurope (Contract 017841) that is funded under the EC 6th Framework Programme for Research and Technological Development. As well, the research leading to these results has received funding from the [EU] Seventh Framework Programme ([FP7/2007-2013] under grant agreement no [PIEF-GA-2008-220842]). The Swiss Federal Office for the Environment and the Swiss Federal Office for Agriculture have financially supported the field experiment. We are very grateful to Kerstin Zeyer and Lukas Emmenegger from the Swiss Federal Laboratories for Materials Science and Technology (EMPA) who provided the in-field calibration device and the cavity ring-down spectroscopy measurements. We would also like to thank the farmer Walter Ingold for all his cooperation as well as Markus Jocher from our group for his support.

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Contributing Institute(s):

1. Troposphäre (IEK-8)

Research Program(s):

1. Atmosphäre und Klima (P23)

Appears in the scientific report 2011

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