Result: Testing CMAQ chemistry sensitivities in base case and emissions control runs at SEARCH and SOS99 surface sites in the southeastern US

Title:
Testing CMAQ chemistry sensitivities in base case and emissions control runs at SEARCH and SOS99 surface sites in the southeastern US
Authors:
ARNOLD, J. R, DENNIS, Robin L
Source:
Special Issue on Model Evaluation: Evaluation of Urban and Regional Eulerian Air Quality ModelsAtmospheric environment (1994). 40(26):5027-5040
Publisher Information:
Oxford: Elsevier Science, 2006.
Publication Year:
2006
Physical Description:
print, 12 ref
Original Material:
INIST-CNRS
Subject Terms:
Environment, Environnement, Climatology, meteorology, Climatologie, météorologie, Pollution, Toxicology, Toxicologie, Sciences exactes et technologie, Exact sciences and technology, Sciences appliquees, Applied sciences, Pollution, Pollution atmosphérique, Atmospheric pollution, Méthodes d'analyse, Analysis methods, Composé organique, Organic compounds, Compuesto orgánico, Analyse sensibilité, Sensitivity analysis, Análisis sensibilidad, Azote oxyde, Nitrogen oxide, Nitrógeno óxido, Composé organique volatil, Volatile organic compound, Compuesto orgánico volátil, Lutte antipollution, Pollution control, Lucha anticontaminación, Modèle prévision, Forecast model, Modelo previsión, Mécanisme réaction, Reaction mechanism, Mecanismo reacción, Oxydant photochimique, Photochemical oxidants, Ozone, Ozono, Performance algorithme, Algorithm performance, Resultado algoritmo, Pollution air, Air pollution, Contaminación aire, Précurseur, Precursor, Prévision pollution atmosphérique, Atmospheric pollution forecasting, Previsión contaminación del ambiente, Qualité air, Air quality, Calidad aire, Réaction photochimique, Photochemical reaction, Reacción fotoquímica, Simulation numérique, Numerical simulation, Simulación numérica, Troposphère, Troposphere, Troposfera, Chemical mechanism, Differential sensitivity, Emissions control strategies, Model evaluation
Subject Geographic:
Amérique du Nord, North America, America del norte, Amérique, America, Etats Unis, United States, Estados Unidos, Etats Unis Sud Est
Document Type:
Conference Conference Paper
File Description:
text
Language:
English
Author Affiliations:
Atmospheric Sciences Modeling Division, Air Resources Laboratory, National Oceanic and Atmospheric Administration, in partnership with the National Exposure Research Laboratory, US Environmental Protection Agency, Office of Research and Development, 1200 6th Avenue/9th FL/OEA-095, Seattle, WA 98101-1128, United States
Mail Drop E243-05, Research Triangle Park, NC 27711, United States
ISSN:
1352-2310
Access URL:
http://pascal-francis.inist.fr/vibad/index.php?action=search&terms=18043225
Rights:
Copyright 2006 INIST-CNRS
CC BY 4.0
Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS
Notes:
Pollution
Accession Number:
edscal.18043225
Database:
PASCAL Archive

Further Information

CMAQ was run to simulate urban and regional tropospheric conditions in the southeastern US over 14 days in July 1999 at 32, 8 and 2 km grid spacings. Runs were made with either of two older mechanisms, Carbon Bond IV (CB4) and the Regional Acid Deposition Model, version 2 (RADM2), and with the more recent and complete California Statewide Air Pollution Research Center, version 1999 mechanism (SAPRC99) in a sensitivity matrix with a full emissions base case and separate 50% control scenarios for emissions of nitrogen oxides (NOX) and volatile organic compounds (VOC). Results from the base case were compared to observations at the Southeastern Aerosol Research and Characterization Study (SEARCH) site at Jefferson Street in Atlanta, GA (JST) and the Southern Oxidant Study (SOS) Cornelia Fort Airpark (CFA) site downwind of Nashville, TN. In the base case, SAPRC99 predicted more ozone (03) than CB4 or RADM2 almost every hour and especially for afternoon maxima at both JST and CFA. Performance of the 8 km models at JST was better than that of the 32 km ones for all chemistries, reducing the 1 h peak bias by as much as 30 percentage points; at CFA only the RADM2 8 km model improved. The 2 km solutions did not show improved performance over the 8 km ones at either site, with normalized 1 h bias in the peak O3ranging from 21% at CFA to 43% at JST. In the emissions control cases, SAPRC99 was generally more responsive than CB4 and RADM2 to NOX and VOC controls, excepting hours at JST with predicted increased O3 from NOX control. Differential sensitivity to chemical mechanism varied by more than ± 10% for NOX control at JST and CFA, and in a similar range for VOC control at JST. VOC control at the more strongly NOX- limited urban CFA site produced a differential sensitivity response of <5%. However, even when differential sensitivities in control cases were small, neither their sign nor their magnitude could be reliably determined from model performance in the full emissions case, meaning that the degree of 03 response to a change in chemical mechanism can differ substantially with the level of precursor emissions. Hence we conclude that properly understanding the effects of changes in a model's chemical mechanism always requires emissions control cases as part of model sensitivity analysis.