title: Ozone deposition to an orange orchard: Partitioning between stomatal and non-stomatal sinks.
abstract: Orange trees are widely cultivated in regions with high concentrations of tropospheric ozone. Citrus absorb ozone through their stomata and emit volatile organic compounds (VOC), which, together with soil emissions of NO, contribute to non-stomatal ozone removal. In a Valencia orange orchard in Exeter, California, we used fast sensors and eddy covariance to characterize water and ozone fluxes. We also measured meteorological parameters necessary to model other important sinks of ozone deposition. We present changes in magnitude of these ozone deposition sinks over the year in response to environmental parameters. Within the plant canopy, the orchard constitutes a sink for ozone, with non-stomatal ozone deposition larger than stomatal uptake. In particular, soil deposition and reactions between ozone, VOC and NO represented the major sinks of ozone. This research aims to help the development of metrics for ozone-risk assessment and advance our understanding of citrus in biosphere-atmosphere exchange.
authors.affiliation: University of California, Berkeley, Department of Environmental Science, Policy, and Management, Berkeley, California, United States. silvano.fares@entecra.it
authors.forename: Silvano
authors.initials: S
authors.lastname: Fares
authors.forename: Robin
authors.initials: R
authors.lastname: Weber
authors.forename: Jeong-Hoo
authors.initials: JH
authors.lastname: Park
authors.forename: Drew
authors.initials: D
authors.lastname: Gentner
authors.forename: John
authors.initials: J
authors.lastname: Karlik
authors.forename: Allen H
authors.initials: AH
authors.lastname: Goldstein
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D032084:Citrus sinensis / Q000737:chemistry / Q000378:metabolism*; D004784:Environmental Monitoring; D010126:Ozone / Q000032:analysis / Q000378:metabolism*; D054046:Plant Stomata / Q000737:chemistry* / Q000378:metabolism; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D012989:Soil Pollutants; D010126:Ozone