| Title: | Attribution of Tropospheric Ozone to NO (x) and VOC Emissions: Considering Ozone Formation in the Transition Regime |
| Author(s): | Wang P; Chen Y; Hu J; Zhang H; Ying Q; |
| Address: | "Zachry Department of Civil Engineering , Texas A&M University , College Station , Texas 77843-3136 , United States. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering , Nanjing University of Information Science & Technology , 219 Ningliu Road , Nanjing 210044 , China. Department of Civil and Environmental Engineering , Louisiana State University , Baton Rouge Louisiana 70803 , United States" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "An improved three-regime (3R) O(3) attribution technique for O(3) source apportionment in regional chemical transport models is developed to divide the entire range of VOC-NO (x)-O(3) formation sensitivity to VOC-limited, transition, and NO (x)-limited regimes based on the value of a regime indicator R. The threshold R values to mark the start ( R(ts)) and end ( R(te)) of the transition regime are defined at the point where O(3)-NO (x) sensitivity turns from negative to positive and where O(3)-NO (x) sensitivity is ten times higher than O(3)-VOC sensitivity, respectively. R(ts) and R(te) are determined using NO (x) and VOC sensitivity simulations in a box model with a modified SAPRC-11 mechanism. For the widely used indicator ration R = ( P(H2O2) + P(ROOH))/ P(HNO3,) which is based on the production rates of H(2)O(2), HNO(3) and organic hydroperoxides (ROOH), the recommended R(ts) and R(te) values are 0.047 and 5.142, respectively. Parameterized attribution functions, depending only on the values of R, are developed to apportion modeled in situ O(3) formation in the transition regime to NO (x) and VOCs. The new 3R and the traditional two-regime (2R) schemes are incorporated into the Community Multiscale Air Quality (CMAQ) model to quantify NO (x) and VOC contributions to regional O(3) concentrations in China in August 2013. The 3R approach predicts approximately 5-10 ppb and up to 15 ppb higher NO (x) contributions to 8 h O(3) in in the North China Plain, the Yangtze River Delta and the Pearl River Delta than the 2R approach. The big differences in O(3) attribution between 2R and 3R can have significant policy implications for air pollution emission controls" |
| Keywords: | *Air Pollutants China Environmental Monitoring Hydrogen Peroxide *Ozone *Volatile Organic Compounds; |
| Notes: | "MedlineWang, Peng Chen, Yuan Hu, Jianlin Zhang, Hongliang Ying, Qi eng Research Support, Non-U.S. Gov't 2018/12/26 Environ Sci Technol. 2019 Feb 5; 53(3):1404-1412. doi: 10.1021/acs.est.8b05981. Epub 2019 Jan 8" |
