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OLS Field Name OLS Field Data
Main Title Correcting RADM's Sulfate Underprediction: Discovery and Correction of Model Errors and Testing the Corrections Through Comparisons against Field Data.
Author Dennis, R. L. ; McHenry, J. N. ; Barchet, W. R. ; Binkowski, F. S. ; Byun, D. W. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div. ;Computer Sciences Corp., Research Triangle Park, NC. Applied Technology Div. ;Battelle Pacific Northwest Labs., Richland, WA. Atmospheric Sciences Dept.
Publisher 1993
Year Published 1993
Report Number EPA/600/J-93/481;
Stock Number PB94-119963
Additional Subjects Sulfates ; Air pollution ; Error analysis ; Deposition ; Seasonal variations ; Regional analysis ; Comparison ; Decision making ; Clouds(Meteorology) ; Acidification ; Revisions ; Pollution sources ; Wind direction ; Field tests ; Regional Acid Deposition Model ; Acid Deposition and Oxidant Model ; Eulerian Model Evaluation Field Study
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NTIS  PB94-119963 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 02/27/1994
Collation 24p
Abstract A serious underprediction of ambient sulfate SO4(sup -2) by two comprehensive, Eulerian models of acid deposition, the Regional Acid Deposition Model (RADM) and the Acid Deposition and Oxidant Model (ADOM), was found in the National Acid Precipitation Assessment Program phase of the Eulerian Model Evaluation Field Study (EMEFS) model evaluation. Two hypotheses were proposed to explain the cause of the underprediction in RADM: insufficient SO4(sup -2) production by nonprecipitating convective clouds and insufficient primary SO4(sup -2) emissions. Modifications of the RADM cloud and scavenging module to better simulate nonprecipitating cumulus clouds are described in detail. Three contrasting pairs of tests using data from the EMEFS were applied to these hypotheses: source vs. downwind regions; mid summer vs. late summer seasons, sunny-dry vs. cloudy-wet synoptic types. The SO4(sup -2) emissions hypothesis, tested by artificially boosting SO4(sup -2) emissions, fared better than expected but was rejected because of its poor performance on the regional and seasonal contrast tests. The RADM nonprecipitating cumulus modification successfully captured the seasonal and the late summer synoptic contrasts but improvement is still needed for the regional and mid summer synoptic contrasts.
Supplementary Notes Pub. in Atmospheric Environment, v27A n6 p975-997 1993. See also PB93-212710. Prepared in cooperation with National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div., Computer Sciences Corp., Research Triangle Park, NC. Applied Technology Div., and Battelle Pacific Northwest Labs., Richland, WA. Atmospheric Sciences Dept.
NTIS Title Notes Journal article.
Category Codes 68A; 55E; 91A
NTIS Prices PC A03/MF A01
Primary Description 600/09
Document Type NT
Cataloging Source NTIS/MT
Control Number 403526323
Origin NTIS
Type CAT