Ozone and sulfur dioxide dry deposition to forests: Observations and model evaluation
Authors:
- Peter L. FinkelsteinPFPeter L. Finkelstein
- Thomas G. EllestadTEThomas G. Ellestad
- John F. ClarkeJCJohn F. Clarke
- Tilden P. MeyersTMTilden P. Meyers
- Donna B. SchwedeDSDonna B. Schwede
- Eric O. HebertEHEric O. Hebert
- Julie A. NealJNJulie A. Neal
Open Access
- 27 June 2000
- journal article
- transport processes
- Published by American Geophysical Union (AGU) in Journal of Geophysical Research: Atmospheres
- Vol. 105 (D12) , 15365-15377
Abstract
Fluxes and deposition velocities of O3 and SO2 were measured over both a deciduous and a mixed coniferous‐deciduous forest for full growing seasons. Fluxes and deposition velocities of O3 were measured over a coniferous forest for a month. Mean deposition velocities of 0.35 to 0.48 cm/s for O3 and 0.6 to 0.72 cm/s for SO2 were observed during the growing seasons of 1997 and 1998. Weekly averages of O3 deposition velocity ranged from 0.25 cm/s at the beginning and end of the season to 1.25 cm/s in late June. SO2 had a smaller seasonal variation, from 0.75 to 1.5 cm/s between the beginning and peak of the season. Because O3 concentrations are higher, the flux of O3 to forests is considerably greater than the flux of SO2. Daytime deposition velocities are very similar at each site, from 0.75 to 0.79 cm/s for O3, and from 1.01 to 1.04 cm/s for SO2. Diurnal cycles for both gases are discussed, as are the impact of some weather events. The peak time for O3 deposition velocity is in midmorning, while it is near midday for SO2. Surface wetness is usually associated with a small increase in deposition velocity, but for some rain events a major increase was noted. Minimum deposition velocities usually occur at night and increase slowly in the predawn hours before light. Comparisons are made between observations of deposition velocity and predictions made with the Meyers multilayer deposition velocity model. While the model is, on average, unbiased for O3, it tends to underpredict the higher deposition velocity values. The model is slightly biased low (underpredicts) for SO2 deposition velocity. The strengths of the model are noted, as are opportunities for improvement.Keywords
This publication has 36 references indexed in Scilit:
- A multilayer model for inferring dry deposition using standard meteorological measurementsJournal of Geophysical Research: Atmospheres, 1998
- Atmospheric deposition of reactive nitrogen oxides and ozone in a temperate deciduous forest and a subarctic woodland: 1. Measurements and mechanismsJournal of Geophysical Research: Atmospheres, 1996
- Seasonal and diurnal variation in the deposition velocity of ozone over a spruce forest in DenmarkWater, Air, & Soil Pollution, 1995
- Exchange of ozone and nitrogen oxides between the atmosphere and coniferous forestWater, Air, & Soil Pollution, 1995
- The Landes experiment: Biosphere‐atmosphere exchanges of ozone and aerosol particles above a pine forestJournal of Geophysical Research: Atmospheres, 1994
- Seasonal contrasts in modelled and observed dry deposition velocities of O3, SO2 and NO2 over three surfacesAtmospheric Environment. Part A. General Topics, 1993
- Modelled and observed dry deposition velocity of O3 above a deciduous forest in the winterAtmospheric Environment. Part A. General Topics, 1992
- Parameterization of surface resistances to gaseous dry deposition in regional-scale numerical modelsAtmospheric Environment (1967), 1989
- Empirical atmospheric deposition parameters—A surveyAtmospheric Environment (1967), 1979
- Study of turbulent diffusion above and within a forest—application in the case of SO2Atmospheric Environment (1967), 1976