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AN OBJECTIVE ANALYSIS TECHNIQUE FOR THE REGIONAL AIR POLLUTION STUDY. PART II
Citation:
Hovland, D., D. Dartt, AND K. Gage. AN OBJECTIVE ANALYSIS TECHNIQUE FOR THE REGIONAL AIR POLLUTION STUDY. PART II. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/4-77/002b.
Description:
This report discusses the application of objective analysis techniques to the computation of trajectories from surface wind observations of the Regional Air Pollution Study in St. Louis. Trajectories were computed over a 100-kilometer square grid centered on St. Louis for two 5-hour periods during July 1975. The variability of the surface wind field was investigated by examining the temporal and spatial variability of computed trajectories. Also, the sensitivity of the computed trajectories to the amount of data employed in the analysis was examined in some detail. The results showed a general lack of sensitivity of the computed trajectories to a single missing observation. However, computed trajectories were very sensitive to missing adjacent observations. In addition to the trajectory analysis, a set of tapes containing gridded winds and temperatures for the St. Louis area were generated.