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. Both canopy-level field measurements and laboratory studies suggest that uptake of NO2through the leaf stomata of vegetation is a significant sink of atmosphericNOx. However, the mechanisms of this foliar NO2 uptake and their impacton NOx lifetimes remain incompletely understood. To understand the leaf-levelprocesses affecting ecosystem-scale atmosphere–biosphere NOx exchange, we haveconducted laboratory experiments of branch-level NO2 deposition fluxes to six coniferousand four broadleaf native California trees using a branch enclosure system with direct laser-induced fluorescence (LIF) detection of NO2. We report NO2 foliar deposition thatdemonstrates a large degree of inter-species variability, with maximum observed depositionvelocities ranging from 0.15 to 0.51 cm s−1 during the daytime, as well as significantstomatal opening during the night. We also find that the contribution of mesophyllic processing tothe overall deposition rate of NO2 varies by tree species but has an ultimatelyinconsequential impact on NOx budgets and lifetimes. Additionally, we find noevidence of any emission of NO2 from leaves, suggesting an effective unidirectionalexchange of NOx between the atmosphere and vegetation.

atmospheric chemistry and physics

Laboratory measurements of stomatal NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; deposition to native California trees and the role of forests in the NO&amp;lt;sub&amp;gt;x&amp;lt;/sub&amp;gt; cycle