Summary
This chapter examines the physical basis for precipitation scavenging, and provides an intermediate-level primer for scavenging calculations. The discussion is presented in the context of spatial and temporal variability of precipitation chemistry. It begins with a qualitative overview of behavior observed on precipitation-chemistry networks, and then provides a physically based rationale for these observations.
The majority of the text is addressed to examining how scavenging models are formulated using formal balances of mass, energy, and momentum in the atmosphere. Basic equations are presented in a highly visualized context, and procedures for “grooming” these basic forms to yield specific scavenging models are discussed. Following this, a number of illustrative examples are presented, and a general process for model selection is described.
Concluding portions of the chapter return to the initial theme of spatial and temporal variability, and give comparisons of selected model simulations with observed behavior. These comparisons are applied to evaluate uncertainties associated with present-day models, and specific areas for future improvement.
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Hales, J.M. (1986). The Mathematical Characterization of Precipitation Scavenging and Precipitation Chemistry. In: Air Pollution. Air Pollution, vol 4 / 4A. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39222-4_5
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