Deposition phenomena are the way the atmosphere cleans itself by depositing chemicals on earth surfaces. This exchange process can be parameterized and modeled by simulating the turbulence characteristics of the atmospheric flow. These turbulence characteristics require specific parameterization procedures to take very different and complex environments such as canopy, water, forest, etc. into account. Many air quality models today include numerical routines – more or less complex – to simulate dry and wet deposition rates of gasses and particulate matter.
The World Meteorological Organization nicely summarizes atmospheric deposition as, "an important process that removes gases and particles from the atmosphere. However, it also is a major environmental issue in several parts of the world due to concerns over acidification and eutrophication of natural ecosystems, bioaccumulation of toxic substances and metals, impacts on biodiversity, human health, and global climate change."
A summary chapter (San José, Pérez, and González Barras, 2005) from the book Air Quality Modeling - Theories, Methodologies, Computational Methods, and Available Databases and Software, Vol II (Zannetti, Ed. 2005) is included as pdf file.
Guide prepared by P. Zannetti (9/2020). For corrections or expansions please contact us.