Record Display for the EPA National Library Catalog


Main Title Comparison of Modelled and Measured Tracer Gas Concentrations during the Across North America Tracer Experiment (ANATEX).
Author Clark, T. L. ; Cohn, R. D. ; Seilkop, S. K. ; Draxler, R. R. ; Heffter, J. L. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;Analytical Sciences, Inc., Research Triangle Park, NC. ;National Oceanic and Atmospheric Administration, Washington, DC.
Publisher Jan 89
Year Published 1989
Report Number EPA/600/D-88/274;
Stock Number PB89-136709
Additional Subjects Atmospheric circulation ; Atmospheric models ; Mathematical models ; Air pollution control ; Chemical analysis ; Predictions ; Evaluation ; Fluorohydrocarbons ; Across North America Tracer Experiment ; Path of pollutants ; Environmental transport ; Tracer studies
Library Call Number Additional Info Location Last
NTIS  PB89-136709 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 17p
The 24-hour surface concentrations of several perfluorocarbon tracer gases measured during the 1987 Across North America Tracer Experiment (ANATEX) provided a unique continental-scale data set with which to evaluate long-range transport and diffusion models. One such model, a multilayer Lagrangian model, was evaluated in the ANATEX Model Evaluation Study (AMES) by comparing distributions and time series of calculated and measured tracer concentrations at bands of sampling sites nearly equidistant from one of the two tracer release sites and by computing spatial differences in the concentration-weighted centroids of 20, 24-hour tracer 'footprints' or composite plumes. The results for this model indicated that it overemphasized the effects of the stronger upper-level winds. In spite of the bias in transport speed, the distributions of the calculated and measured concentrations were quite similar.