Gas-Phase Chemistry Dominates O3 Loss To A Forest, Implying A Source Of Aerosols And Hydroxyl Radicals To The Atmosphere

  • Sites: US-Blo
  • Publication Type: JOUR
  • Authors: Kurpius, M. R.; Goldstein, A. H.

  • Tropospheric ozone (O3) effectively deposits to forested ecosystems but the fate of O3 within the forest canopy is unresolved. We partitioned total measured ecosystem daytime O3 deposition to a ponderosa pine (Pinus ponderosa) forest into its major loss pathways; stomatal uptake, non-stomatal surface deposition, and gas-phase chemistry. Total O3 flux was dominated by gas-phase chemistry during the summer and by stomatal uptake during winter. O3 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 O3 loss process within the canopy. The reaction of O3 with biogenically-emitted hydrocarbons leads to both hydroxyl radical formation and secondary aerosol growth with important effects on atmospheric chemistry and climate.


  • Journal: Geophysical Research Letters
  • Funding Agency: —
  • Citation Information:
  • Volume: 30
  • No: 7
  • Pages: n/a-n/a
  • Publication Year: 2003/04
  • DOI: 10.1029/2002gl016785