Abstract
A nested-network program for obtaining data on the dry deposition of SO2 and SO4 − has been initiated at a small array of locations (6 in 1985, presently 13) across North America. The procedures involved rely on the availability of models for deriving dry deposition rates from observations of air concentrations and of meteorological and surface properties known to influence the deposition velocity. At a subset of locations (i.e., 3), the results obtained by this indirect method are tested by comparison against more direct methods. One of the first comparison experiments of this series was conducted at Oak Ridge in July 1985 when the fluxes determined by inferential methods were compared to those measured by eddy correlation. The results obtained suggest that initial computer routines, developed to estimate deposition velocity for SOz on a routine basis, overestimate the deposition velocity by about 20% to a mixed-species deciduous forest. The difference is possibly due to the omission of water stress as a contributing factor in the initial computer routines, but might also be associated with chemical processes at the substomatal level.
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Matt, D.R., McMillen, R.T., Womack, J.D. et al. A comparison of estimated and measured SO2 deposition velocities. Water Air Soil Pollut 36, 331–347 (1987). https://doi.org/10.1007/BF00229676
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DOI: https://doi.org/10.1007/BF00229676