Citation:

Clarke, J.F., P.L. Finkelstein, T. Ellestad, E. Edgerton, AND J. Bowser. DESIGN AND IMPLEMENTATION OF A TRANSPORTABLE SYSTEM FOR DIRECT MEASUREMENT OF DRY DEPOSITION FLUXES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/049 (NTIS PB95199659), 1995.

Description:

Dry deposition of air pollutants is expensive and difficult to measure. icks et al. (1985) proposed the dry deposition inferential model determines dry deposition fluxes as the product of a measured concentration and a modeled deposition velocity. eposition velocity is calculated based on an understanding of physical and chemical processes of pollutant transfer and absorption by plants and surfaces as described through measured meteorological and site vegetation variables. nnual and seasonal dry deposition as derived through the inferential model and concentration measurements have been reported for the nine-site NOAA CORE network (Meyers et al., 1991) and for the 50-site U.S. Environmental Protection Agency (EPA) National Dry Deposition Network (NDDN) (Clarke and Edgerton, 1993). PA has recently initiated a program to directly measure dry deposition fluxes to evaluate and improve the inferential dry deposition model. ransportable system for directly measuring fluxes of O3, SO2, and HNO3 was built and deployed at two NDDN sites in 1994. he system, instrumentation, and sampling protocol are described briefly herein, along with some preliminary data from the 1994 field program.

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