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MEASUREMENTS OF DRY DEPOSITION VELOCITY MODEL EVALUATION
Citation:
Finkelstein, P.L., J. Clarke, AND T. Ellestad. MEASUREMENTS OF DRY DEPOSITION VELOCITY MODEL EVALUATION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/051 (NTIS PB95217832).
Description:
The U.S. Environmental Protection Agency's (EPA) nationwide network to Deposition Network dry deposition of gases and particles, the National Dry Deposition Network (NDDN), measures not deposition, but concentration of pollutants and meteorological relevant to deposition processes. The amount of pollutant being deposited per unit area and time, the flux, is computed as the product of the measured concentration and calculated deposition velocity. eposition velocity is estimated using and inferential model developed by NOAA's Atmospheric Turbulence and Diffusion Division. he model simulates the physical and chemical processes of pollutant transfer and adsorption by plants and surfaces using measured meteorological and site vegetation variables as input. nnual and seasonal dry deposition as derived from the inferential model and concentration measurements are reported for the 50 site EPA NDDN. e have recently begun an independent effort to evaluate deposition velocity models by making direct flux measurements and concurrent meteorological measurements needed for the model at several NDDN sites, which difference in terrain, climate, soil, and vegetation cover. he measurement system, instrumentation, and sampling protocol are described briefly herein, along with some preliminary data from our 1994 field program. ore detailed analyses are currently underway.