OLS : Record


Main Title Evaluation of the regional oxidant model (version 2.1) using ambient and diagnostic simulation {microform} /
Author Pierce, Thomas E.; Schere, K. L.; Doll, D. C.; Heilman, W. E.
CORP Author Computer Sciences Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher U.S. Environmental Protection Agency, Atmospheric Research and Exposure Assessment Laboratory,
Place Published Research Triangle Park, NC :
Year Published 1990
Report Number EPA/600/3-90/046; EPA-68-01-7365
Stock Number PB90-225293
OCLC Number 45427365
Subjects Air pollution control; Ozone; Computerized simulation; Study estimates; Performance evaluation; Field tests; Comparison; Oxidizers; Concentration(Composition); Sites; Wind(Meteorology); Spatial distribution; Statistical analysis; Regional analysis; Air pollution sampling; Emission inventories; State implementation plans; Diagnostic techniques; Northeast Region(United States); Environmental transport; Meteorological parameters; Boundary conditions
Subject Added Ent Air--Pollution--Mathematical models; Photochemical oxidants--Mathematical models
Internet Access
Description Access URL
Library   Call Number Additional Info Location Date Modified
ERBD PB90-225293 NERL/ESD-LV Library/Las Vegas,NV 12/01/2000
NTIS PB90-225293 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
Collation 112 p. : ill. ; 28 cm.
Abstract The latest version of EPA's Regional Oxidant Model, ROM2.1 was evaluated to determine and to document its accuracy. In this evaluation, model estimates were compared with ambient measurements of hourly surface ozone collected on 26 days during the summer of 1985 in the northeastern United States. The observed and modeled maximum daytime concentrations agreed on average within 2 ppb (79 ppb versus 77 ppb), but the model tended to underestimate the concentrations at the higher extremes of the frequency distribution, particularly in the southern and western portions of the model domain. Estimated and observed spatial patterns for three day maximum ozone generally showed good agreement. ROM2.1 improved noticeably over ROM2.0 with regard to the orientation of the high-ozone plumes in the Northeast Corridor. A unique aspect of the ambient evaluation was an assessment of the model's ability to estimate boundary conditions for the Urban Airshed Model. Near New York City, estimated and observed boundary conditions agreed to within 4 ppb (57 ppb versus 61 ppb). Model performance degraded, however, during some situations with dynamic mesoscale wind flow conditions. A series of diagnostic tests was also done on ROM2.1 to investigate the accuracy of its numerical solution algorithms. When the model was subjected to extremely steep concentration gradients (steeper than those observed in the ambient atmosphere), the model did not conserve mass during a 48 h simulation, deviating by as much as 18% from the initialized value. However, tests with a mass-corrected version of the full simulation model showed that predicted ozone values deviated only slightly (less than 4%) from the original model.
Notes "April 1990." "EPA/600/3-90/046."
Supplementary Notes Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Author Added Ent
Pierce, Thomas E.
Corporate Au Added Ent Atmospheric Research and Exposure Assessment Laboratory (U.S.)
PUB Date Free Form {1990}
NTIS Prices PC A06/MF A01
BIB Level m
OCLC Time Stamp 20001127164546
Cataloging Source OCLC/T
Language eng
Origin OCLC
OCLC Rec Leader 01149nam 2200277Ka 45020