Journal
ATMOSPHERIC ENVIRONMENT
Volume 43, Issue 36, Pages 5759-5770Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2009.07.056
Keywords
CMAQ; VOC; Model performance; Non-methane organic compounds; Ozone; Carbon bond mechanism; Photochemical assessment monitoring stations
Funding
- U.S. EPA [CR83228001]
- New York State Energy Research and Development Authority (NYSERDA) [10599]
- Mid-Atlantic States Section of the Air and Waste Management Association
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This study compares speciated model-predicted concentrations (i.e., mixing ratios) of volatile organic compounds (VOCs) with measurements from the Photochemical Assessment Monitoring Stations (PAMS) network at sites within the northeastern US during June-August of 2006. Measurements of total non-methane organic compounds (NMOC), ozone (O-3), oxides of nitrogen (NOx) and reactive nitrogen species (NOy) are used for supporting analysis. The measured VOC species were grouped into the surrogate classes used by the Carbon Bond IV (CB4) chemical mechanism. It was found that the model typically over-predicted all the CB4 VOC species, except isoprene, which might be linked to overestimated emissions. Even with over-predictions in the CB4 VOC species, model performance for daily maximum O-3 was typically within +/-15%. Analysis at an urban site in NY, where both NMOC and NO, data were available, suggested that the reasonable ozone performance may be possibly due to compensating overestimated NOx concentrations, thus modulating the NMOC/NOx ratio to be in similar ranges as that of observations. (C) 2009 Elsevier Ltd. All rights reserved.
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