Deposition phenomena are the way in which the atmosphere cleans itself. The process is efficient as only a few gases (most notably CO 2) show signs of global increase in spite of the large emission of pollutants from both natural and anthropogenic sources. There are two types of deposition mechanisms: dry deposition, i.e., the uptake at the earth’s surface (soil, water, or vegetation), and wet deposition, i.e., absorption into droplets followed by droplet precipitation (e.g., by rain) or impaction on the earth’s surface (e.g., fog droplets).
KeywordsDeposition Velocity Gravitational Settling Deposition Phenomenon Precipitation Scavenge Lagrangian Particle Method
Unable to display preview. Download preview PDF.
- Doran, J.C., et al. (1984): Field validation of exposure assessment models. Vol. I, Data. U.S. EPA Document EPA–600/3–84–092a. Office of Research and Development, Research Triangle Park, North Carolina. Also NTIS PB85–107209, Springfield, Virginia.Google Scholar
- Finlayson-Pitts, B.J., and J.N. Pitts, Jr. (1986): Atmospheric Chemistry. New York: John Wiley.Google Scholar
- Hales, J.M. (1986): The mathematical characterization of precipitation scavenging and precipitation chemistry. In The Handbook of Environmental Chemistry, Vol. 4, Part A, edited by O. Hutzinger. Heidelberg: Springer-Verlag.Google Scholar
- Hicks, B.B. (1982): In Critical Assessment Document on Acid Deposition (Chapter VII - Dry Deposition). ATDL Contributory File 81/24. Atmospheric Turbulence and Diffusion Laboratory, NOAA, Oak Ridge, Tennessee.Google Scholar
- Houghton, D.D., Ed. (1985): Handbook of Applied Meteorology. New York: WileyInterscience.Google Scholar
- O’Dell, R.A., M. Taheri, and R.L. Kabel (1977): A model for uptake of pollutants by vegetation. JAPCA, 27: 1104–1109.Google Scholar
- Pleim, J.E., A. •Venkatram, and R.J. Yamartino (1984): The Dry Deposition Model, Vol. 4. ADOMITADAP Model Development Program. Ontario Ministry of the Environment, Rex-dale, Ontario, Canada.Google Scholar
- Seinfeld, J.H. (1986): Atmospheric Chemistry and Physics of Air Pollution. New York: John Wiley.Google Scholar
- Wesely, M.L., and B.B. Hicks (1977): Some factors that affect the deposition rates of sulfur dioxide and similar gases on vegetation. JAPCA, 27: 1110–1116.Google Scholar
- Wesely, M.L. (1989): Parameterization of surface resistances to gaseous dry deposition in regional—scale numerical models. Atmos. Environ., 6: 1293–1304.Google Scholar
- Wisniewski, J., and J.D. Kinsman (1982): An overview of acid rain monitoring activities in North America. J. Climate and Appl. Meteor. Soc., 63: 598–618.Google Scholar
- Yamartino, R.J., J.S. Scire, S.R. Hanna, G.R. Carmichael, Y.S. Chang (1989): CALGRID: A mesoscale photochemical grid model. Sigma Research Corp. Report A049–1. Prepared for the California Air Resources Board, Sacramento, California.Google Scholar
- Zannetti, P., and N. Al—Madani (1983): Simulation of transformation, buoyancy and removal processes by Lagrangian particle methods. Fourteenth ITM Meeting on Air Pollution Modeling and Its Application. Copenhagen, Denmark, September 1983.Google Scholar