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. NO2 foliar deposition through the stomata of leaveshas been identified as a significant sink of NOx within aforest canopy. In this study, we investigated NO2 and NO exchangebetween the atmosphere and the leaves of the native California oak treeQuercus agrifolia using a branch enclosure system. NO2 detection was performed with laser-induced fluorescence (LIF), which excludesbiases from other reactive nitrogen compounds and has a low detection limitof 5–50 ppt. We performed both light and dark experiments withconcentrations between 0.5 and 10 ppb NO2 and NO under constantambient conditions. Deposition velocities for NO2 during light anddark experiments were 0.123±0.009 and 0.015±0.001  cm s −1 , respectively. Much slower deposition was seen for NO, withdeposition velocities of 0.012±0.002 and 0.005±0.002  cm s −1 measured during light and dark experiments, respectively.This corresponded to a summed resistance of the stomata and mesophyll of 6.9±0.9  s cm −1 for NO2 and 140±40  s cm −1 forNO. No significant compensation point was detected for NO2 uptake,but compensation points ranging from 0.74 to 3.8 ppb were observed for NO. NO2 and NO deposition velocities reported here are comparable bothwith previous leaf-level chamber studies and inferences from canopy-levelfield measurements. In parallel with these laboratory experiments, we haveconstructed a detailed 1-D atmospheric model to assess the contribution ofleaf-level NOx deposition to the total NOx loss and NOx canopy fluxes. Using theleaf uptake rates measured in the laboratory, these modeling studies suggestthat loss of NOx to deposition in a California oak woodlandcompetes with the pathways of HNO3 and RO NO2 formation, withdeposition making up 3 %–22 % of the total NOx loss.Additionally, foliar uptake of NOx at these rates couldaccount for ∼15  %–30 % canopy reduction of soil NOx emissions.

atmospheric chemistry and physics

Measurements of NO and NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; exchange between the atmosphere and &amp;lt;i&amp;gt;Quercus agrifolia&amp;lt;/i&amp;gt;