Measurements of ammonia emissions from spreading of manure using gradient FTIR techniques

B. Galle, L. Klemedtsson, B. Bergqvist, M. Ferm, K. Törnqvist, D.W.T. Griffith, N.-O. Jensen, F. Hansen

    Research output: Contribution to journalJournal articleResearchpeer-review


    Emissions of biogenic trace gases from soils and plants often show strong spatial and temporal variation. Thus, there is a need for the development of area-integrating measurement techniques with good time resolution. The present paper describes area-integrated measurements of ammonia emissions after spreading of pig slurry on a wheat field, based on flux-gradient measurements using Fourier transform infrared (FTIR) spectroscopy. Two methods are described; the aerodynamic method where the flux is derived from measured micrometeorological parameters, and a tracer method where the flux is derived from simultaneous measurements of a tracer gas released over the area under study. Although not ideal in the actual measurement situation, this latter method has a potential for use on more local sources with less restrictions on micrometeorological conditions, and is thus included for validation. A code for modelling of the "footprint" of gradient measurements is also described, and is used to compare the results from the above-mentioned methods. (C) 2000 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    JournalAtmospheric Environment
    Issue number28
    Pages (from-to)4907-4915
    Publication statusPublished - 2000


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