Аннотация:Tropospheric ozone (O 3 ) effectively deposits to forested ecosystems but the fate of O 3 within the forest canopy is unresolved. We partitioned total measured ecosystem daytime O 3 deposition to a ponderosa pine ( Pinus ponderosa ) forest into its major loss pathways; stomatal uptake, non‐stomatal surface deposition, and gas‐phase chemistry. Total O 3 flux was dominated by gas‐phase chemistry during the summer and by stomatal uptake during winter. O 3 loss due to gas‐phase chemistry was exponentially dependent on temperature, with the same functionality as biogenic hydrocarbon emissions, implicating reactions with biogenic hydrocarbons as the likely gas‐phase chemical O 3 loss process within the canopy. The reaction of O 3 with biogenically‐emitted hydrocarbons leads to both hydroxyl radical formation and secondary aerosol growth with important effects on atmospheric chemistry and climate.
