Deposition of nitrogen oxides and ozone to Danish forest sites

K. Pilegaard, N.O. Jensen, P. Hummelshøj

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch


    Preliminary results of eddy correlation measurements of fluxes of NO2, and O3 made over a coniferous and a deciduous forest site in Denmark are presented.

    The total resistance to deposition are calculated and subdivided into aerodynamic, viscous sub-layer and surface resistance for investigation of the influence of meteorological factors. The viscous sub-layer resistance is derived by a new theory, taking the bluff roughness elements of the forest and the dimension of the needles/leaves as well as the LAI into account. The fluxes of nitrogen dioxide and ozone are related to the fluxes of water vapour and carbon dioxide.

    The results from the coniferous forest site (Norway spruce) show a diurnal variation in the deposition velocities and surface resistances during the growth period, which is consistent with a stomatal uptake of the gases. However, a substantial deposition is also found at night and in winter indicating a significant role of atmospheric chemistry and surface reactions.

    The experiment at the deciduous forest site (beech) shows the difference in deposition to the site before and after bud burst, thus describing the influence of the stomatal activity of the leaves on the uptake of gases in the forest ecosystem.

    Copyright © 1995 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Title of host publicationAcid rain research: Do we have enough answers? : Proceedings of a Specialty Conference
    EditorsG.J. Heij, J.W. Erisman
    Place of PublicationNew York
    Publication date1995
    ISBN (Print)978-0-444-82038-9
    Publication statusPublished - 1995
    EventConference on acid rain - 's-Hertogenbosch (NL), 10-12 Oct
    Duration: 1 Jan 1994 → …


    ConferenceConference on acid rain
    City's-Hertogenbosch (NL), 10-12 Oct
    Period01/01/1994 → …
    SeriesStudies in Environmental Science


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