Title: A modeling study of the impact of urban trees on ozone
Author: Nowak, David J.; Civerolo, Kevin L.; Rao, S. Trivikrama; Sistla, Gopal; Luley, Christopher J.; Crane, Daniel E.
Source: Atmospheric Environment. 34: 1601-1613.
Publication Series: Scientific Journal (JRNL)
Description: Modeling the effects of increased urban tree cover on ozone concentrations (July 13-15, 1995) from Washington, DC, to central Massachusetts reveals that urban trees generally reduce ozone concentrations in cities, but tend to increase average ozone concentrations in the overall modeling domain. During the daytime, average ozone reductions in urban areas (1 ppb) were greater than the average ozone increase (0.26 ppb) for the model domain. Interactions of the effects of trees on meteorology, dry deposition, volatile organic compound (VOC) emissions, and anthropogenic emissions demonstrate that trees can cause changes in dry deposition and meteorology, particularly air temperatures, wind fields, and boundary layer heights, which, in turn, affect ozone concentrations. Changes in urban tree species composition had no detectable effect on ozone concentrations. Increasing urban tree cover from 20 to 40% led to an average decrease in hourly ozone concentrations in urban areas during daylight hours of 1 ppb (2.4%) with a peak decrease of 2.4 ppb (4.1%). However, nighttime (20:OO-1:00 EST) ozone concentrations increased due to reduced wind speeds and loss of NOx, scavenging of ozone from increased deposition of NOx,. Overall, 8-hour average ozone concentration in urban areas dropped by 0.5 ppb (1%) throughout thc day.
Keywords: urban forestry, air quality modeling, photochemistry, urban meteorology, biogenic hydrocarbons, dry deposition
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
XML: View XML
Nowak, David J.; Civerolo, Kevin L.; Rao, S. Trivikrama; Sistla, Gopal; Luley, Christopher J.; Crane, Daniel E. 2000. A modeling study of the impact of urban trees on ozone. Atmospheric Environment. 34: 1601-1613.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility