Title: Comparison of Different Algorithms for Stomatal Ozone Flux Determination from Micrometeorological Measurements
Citation: WATER AIR AND SOIL POLLUTION vol. 179 p. 309-321
Publisher: SPRINGER
Publication Year: 2007
JRC N°: JRC36995
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC36995
Type: Articles in periodicals and books
Abstract: see attached document - The determination of stomatal ozone fluxes is essential to assess the potential damage to plants due to ozone uptake. This parameter is not accessible directly with measurements, but can be deduced through algorithms using observational data. Total ozone fluxes and water vapour fluxes are generally used. Water vapour fluxes give an indication on stomal aperture, which is the controlling factor of ozone uptake by vegetation. In this work, a series of observations made during the growing season over an onion field are used to show the equivalence of two algorithms found in the literature to derive ozone stomatal fluxes and both based on the similarity between ozone stomatal fluxes and water vapour stomatal fluxes. One of these algorithms uses the Penman-Monteith approach, where the water vapour pressure deficit is calculated using air temperatures; the second calculates, with another formulation, the water vapour deficit from the leaf temperature. The two approaches lead to the same results if applied properly, as shown in this work, both theoretically and numerically.
JRC Directorate:Sustainable Resources

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