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To what extent do molecular collisions arising from water vapour efflux impede stomatal O3 influx?

Journal article
Authors Johan Uddling
Rainer Matyssek
Jan B. C. Pettersson
Gerhard Wieser
Published in Environmental Pollution
Volume 170
Pages 39-42
ISSN 0269-7491
Publication year 2012
Published at Department of Biological and Environmental Sciences
Department of Chemistry and Molecular Biology
Pages 39-42
Language en
Keywords Carbon dioxide, Molecular collisions, Ozone, Stomata, Water vapour
Subject categories Other Earth and Related Environmental Sciences, Biophysics, Botany


Pre-requisite for reliable O 3 risk assessment for plants is determination of stomatal O 3 uptake. One unaddressed uncertainty in this context relates to transpiration-induced molecular collisions impeding stomatal O 3 influx. This study quantifies, through physical modelling, the error made when estimating stomatal O 3 flux without accounting for molecular collisions arising from transpiratory mass flow of gas out of the leaf. The analysis demonstrates that the error increases with increasing leaf-to-air water vapour mole fraction difference (Δw), being zero in water vapour saturated air and 4.2% overestimation at Δw of 0.05. Overestimation is approximately twice as large in empirical studies quantifying stomatal O 3 flux from measured leaf or canopy water flux, if neglecting both water vapour-dry air collisions (causing overestimation of leaf conductance) and collisions involving O 3. Correction for transpiration-induced molecular collisions is thus relevant for both empirical research and for large-scale modelling of stomatal O 3 flux across strong spatial Δw gradients. Negligence of molecular collisions arising from transpiration causes overestimation of stomatal ozone flux that increase with leaf-to-air mole fraction difference of water vapour.

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