Journal
BOUNDARY-LAYER METEOROLOGY
Volume 167, Issue 2, Pages 303-326Publisher
SPRINGER
DOI: 10.1007/s10546-017-0310-x
Keywords
Deposition; Eddy covariance; Non-stomatal conductance; Ozone flux; Stomatal conductance
Categories
Funding
- NitroEurope EU 6th FP [017841]
- Animal Change EU 7th FP [266018]
- ECLAIRE EU 7th FP [282910]
- Hungarian Scientific Research Foundation (OTKA) [NN109679, K83909]
- Research Centre of Excellence, Hungary [8526-5/2014/TUDPOL]
- NERC [ceh020001] Funding Source: UKRI
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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 . 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 , 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 where soil uptake also has a role in ozone deposition.
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