Air Resources Laboratories atmospheric transport and dispersion model (ARL-ATAD)
- 1 February 1980
- report
- Published by Office of Scientific and Technical Information (OSTI)
Abstract
The Air Resources Laboratories Atmospheric Transport and Dispersion Model (ATAD) is oriented toward practical application for pollution studies. ATAD calculates trajectories of 5 days duration from any number of origins, starting every 6 hours during any selected period (e.g., a day, month, or season), moving either forward or backward in time. Each trajectory is calculated using transport winds averaged in a vertical layer. Dispersion calculations are made for the forward trajectories. Standard model output includes tables of transport layer depth, maximum vertical wind shear in the transport layer, and trajectory positions. Optional output includes trajectory plots and maps of time averaged surface air concentrations and deposition amounts. A discussion is presented of the input data, with a description of the transport and dispersion techniques used in ATAD and examples of model output. The input meteorological data format and data tape availability are also described, and ATAD operating instructions are given.Keywords
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