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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-240
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-240
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  25 Mar 2020

25 Mar 2020

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This preprint is currently under review for the journal ACP.

Laboratory measurements of stomatal NO2 deposition to native California trees and the role of forests in the NOx cycle

Erin R. Delaria1, Bryan K. Place1, Amy X. Liu1, and Ronald C. Cohen1,2 Erin R. Delaria et al.
  • 1Department of Chemistry, University of California Berkeley, Berkeley, CA, USA
  • 2Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA, USA

Abstract. Both canopy-level field measurements and laboratory studies suggest that absorption of NO2 through the leaf stomata of vegetation is a significant sink of atmospheric NOx. However, the mechanisms of this foliar NO2 uptake and their impact on NOx lifetimes remains incompletely understood. To understand the leaf-level processes affecting ecosystem scale atmosphere-biosphere NOx exchange, we have conducted laboratory experiments of branch-level NO2 deposition fluxes to six coniferous and four broadleaf native California trees using a branch enclosure system with direct Laser Induced Fluorescence (LIF) detection of NO2. We report NO2 foliar deposition that demonstrates a large degree of inter-species variability, with maximum observed deposition velocities ranging from 0.15–0.51 cm/s during the daytime, as well as significant stomatal opening during the night. We also find that the contribution of mesophyllic processing to the overall deposition rate of NO2 varies by tree species, but has an ultimately inconsequential impact on NOx budgets and lifetimes. Additionally, we find no evidence of any emission of NO2 from leaves, suggesting an effective uni-directional exchange of NOx between the atmosphere and vegetation.

Erin R. Delaria et al.

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Erin R. Delaria et al.

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Latest update: 07 Aug 2020
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Short summary
Observations of NO2 deposition to vegetation have been widely reported but the magnitude and mechanism remain uncertain. We use laboratory measurements to study NO2 deposition to leaves of ten native California tree species. We report important differences in the uptake rates between species and find that this process is primarily diffusion-regulated. We suggest that processes within leaves at a cellular level represent a negligible limitation to NO2 deposition at the canopy level.
Observations of NO2 deposition to vegetation have been widely reported but the magnitude and...
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