Abstract
The two basic methods for performing regional acid deposition calculations on a main frame computer have been adapted to the IBM PC LOTUS 1-2-3 spreadsheet system. The first method uses the so-called unit transfer matrices of ambient sulfate concentrations and wet and dry sulfur depositions from eight long-range transport models and emission vectors for historical, current, and future periods to calculate concentrations and depositions from each of eleven large source regions to each of 9 targeted sensitive receptors in eastern North America. The second method uses a simple regional climatological deposition model (RCDM) that is an Eulerian-type model, but with simplifications in physical and chemical processes that provide an analytical solution to the conservation of mass equations, and thus is free from numerical solution errors. The purpose of this paper is to provide documentation of the PC adaptation of the transfer matrix algebra and simple climatological deposition model methods. The paper includes schematic diagrams of the two basic methods and of the spreadsheet layouts and listings of the LOTUS MACROS used to facilitate the calculations. The system is readily available and easily transferable by either remote access or copy on diskettes. Some recommendations for further enhancement of the PC-regional acid deposition calculation system are provided.
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