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RECORD NUMBER: 2 OF 5

OLS Field Name OLS Field Data
Main Title Comparison of Modified Carson and EPA Mixing Height Estimates Using Data from Five Field Experiments.
Author Paumier, J. O. ; Irwin, J. S. ;
CORP Author Computer Sciences Corp., Research Triangle Park, NC. ;National Oceanic and Atmospheric Administration, Silver Spring, MD. Atmospheric Sciences Modeling Div.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher 1990
Year Published 1990
Report Number EPA/600/D-90/234;
Stock Number PB91-162495
Additional Subjects Mathematical models ; Atmospheric diffusion ; Atmospheric circulation ; Height ; Field tests ; Meteorology ; Performance evaluation ; Mixing ; Air quality ; Convective flow ; Atmospheric boundary layer flow ; Comparison ; Air pollution ; Environmental transport ; CWB model ; EPA model ; CRSTER model
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB91-162495 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/13/1991
Collation 14p
Abstract
The performance of two mixing height models are compared to observed mixing heights during convective conditions. The first model integrates the hourly surface heat flux and friction velocity to compute convective and mechanical estimates, respectively. The second model uses an interpolation approach that is currently recommended by the U.S. Environmental Protection Agency for use in air quality regulating analysis. The results suggest that both models perform best when estimating late afternoon mixing heights; nearly 85% of the estimates from both models are within 40% of the observed values. For the entire daytime period, the first model produced the least biased results; all the estimates, on average were within a factor of two of the observed mixing heights. The second model performed poorly in the hours shortly after sunrise, but was comparable to the first model for the latter part of the day.