Comparison of Different Algorithms for Stomatal Ozone Flux Determination from Micrometeorological Measurements

Giacomo Alessandro Gerosa*, Federico Derghi, Stanislaw Cieslik

*Corresponding author

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

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 stomatal 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.
Original languageEnglish
Pages (from-to)309-321
Number of pages13
JournalWATER AIR AND SOIL POLLUTION
DOIs
Publication statusPublished - 2007

Keywords

  • Deposizione di ozono
  • Resistenza stomatica

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