Measurements of ammonia flux to a spruce stand in Denmark

H.V. Andersen, M.F. Hovmand, P. Hummelshøj, N.O. Jensen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    This work demonstrates the existence of a linear relation between the deposition velocity of ammonia and the friction velocity measured above a spruce stand in the western part of Denmark. In order to estimate the ammonia deposition velocity and flux to a Norway spruce forest, concentration gradients of ammonia and several meteorological parameters were measured in a meteorology tower during two periods, 1 week in spring and 1 week in late summer 1991. The estimated deposition velocities lie in the range −0.125 to 0.201 m s−1, with a mean of 0.026 m s−1. The deposition velocity and the flux were generally largest in the afternoon. On the basis of 24-h measurements of ammonia and routine meteorological measurements the relation between deposition velocity and friction velocity is extrapolated to an estimate of the average flux for the growing season May to September 1991. The estimate gave an average flux of 87 μg NH3 N m−2 h−1 (=0.02 μg NH3 N m−2 s−1). The average deposition velocity for the period was 0.045 m s−1.
    Original languageEnglish
    JournalAtmospheric Environment
    Volume27
    Issue number2
    Pages (from-to)189-202
    ISSN1352-2310
    DOIs
    Publication statusPublished - 1993

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