An attempt to partition stomatal and non-stomatal ozone deposition parts on a short grassland

Horvath, L.; Koncz, P.; Moring, A.; Nagy, Z.; Pintér, K.; Weidinger, T.. 2018 An attempt to partition stomatal and non-stomatal ozone deposition parts on a short grassland. Boundary-Layer Meteorology, 167 (2). 303-326.

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To evaluate the damaging effect of tropospheric ozone on vegetation, it is important to evaluate the stomatal uptake of ozone. Although the stomatal flux is a dominant pathway of ozone deposition onto vegetated surfaces, non-stomatal uptake mechanisms such as soil and cuticular deposition also play a vital role, especially when the leaf area index LAI<4. In this study, we partitioned the canopy conductance into stomatal and non-stomatal components. To calculate the stomatal conductance of water vapour for sparse vegetation, we firstly partitioned the latent heat flux into effects of transpiration and evaporation using the Shuttleworth–Wallace (SW) model. We then derived the stomatal conductance of ozone using the Penman–Monteith (PM) theory based on the similarity to water vapour conductance. The non-stomatal conductance was calculated by subtracting the stomatal conductance from the canopy conductance derived from directly-measured fluxes. Our results show that for short vegetation (LAI=0.25) dry deposition of ozone was dominated by the non-stomatal flux, which exceeded the stomatal flux even during the daytime. At night the stomatal uptake of ozone was found to be negligibly small. In the case of vegetation with LAI≈1, the daytime stomatal and non-stomatal fluxes were of the same order of magnitude. These results emphasize that non-stomatal processes must be considered even in the case of well-developed vegetation where cuticular uptake is comparable in magnitude with stomatal uptake, and especially in the case of vegetated surfaces with LAI<4 where soil uptake also has a role in ozone deposition.

Item Type: Publication - Article
Digital Object Identifier (DOI):
CEH Sections/Science Areas: Atmospheric Chemistry and Effects (Science Area 2017-)
ISSN: 0006-8314
Additional Keywords: deposition, eddy covariance, non-stomatal conductance, ozone flux, stomatal conductance
NORA Subject Terms: Atmospheric Sciences
Date made live: 11 Jan 2018 11:03 +0 (UTC)

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