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Decoupled direct sensitivity analysis of regional ozone pollution over the Pearl River Delta during the PRIDE-PRD2004 campaign
Abstract High-order decoupled direct method is applied to investigate O3-precursor sensitivity during the Program of Regional Integrated Experiments of Air Quality over the Pearl River Delta (PRD) Region, China in October 2004 (PRIDE-PRD2004). First-order sensitivity coefficients of O3 show a NOx-inhibited chemistry along the polluted plumes in central and southern PRD areas, and a NOx-limited condition over larger areas of the western, eastern and northern PRD. A nonlinearity ratio derived from O3 sensitivity coefficients clearly describes the nonlinear feature of O3 chemistry over PRD. The distributions of NOx- and VOC-sensitive regimes are determined by near-ground flow conditions, and O3 sensitivity is found to shift from VOC-sensitive conditions to NOx-sensitive conditions from morning to afternoon in central and western areas of the PRD. Elevated surface O3 around mid-afternoon in October mainly occurred in VOC-sensitive regions or those NOx-limited areas in close vicinity of the VOC-sensitive regions. Ratios of H2O2/HNO3 and peroxides/HNO3 for indicating O3-precursor sensitivity are evaluated and the transition values of 0.45 for H2O2/HNO3 and 0.80 for peroxides/HNO3 were found, with an overall accuracy of about 92% for sensitivity identification at elevated O3 hours in afternoons during the campaign.
Highlights ► HDDM-3D is applied to assess O3–NOx–VOC sensitivities for the first time in the PRD. ► A spatially non-uniform & temporally dynamic O3 sensitivity is characterized in PRD. ► A revised nonlinearity ratio illustrates nonlinear features of O3 chemistry in PRD. ► A new method is proposed to identify the transition value of photochemical indicator. ► A transition value of 0.45 for H2O2/HNO3 is determined with overall accuracy of 92%.
Decoupled direct sensitivity analysis of regional ozone pollution over the Pearl River Delta during the PRIDE-PRD2004 campaign
Abstract High-order decoupled direct method is applied to investigate O3-precursor sensitivity during the Program of Regional Integrated Experiments of Air Quality over the Pearl River Delta (PRD) Region, China in October 2004 (PRIDE-PRD2004). First-order sensitivity coefficients of O3 show a NOx-inhibited chemistry along the polluted plumes in central and southern PRD areas, and a NOx-limited condition over larger areas of the western, eastern and northern PRD. A nonlinearity ratio derived from O3 sensitivity coefficients clearly describes the nonlinear feature of O3 chemistry over PRD. The distributions of NOx- and VOC-sensitive regimes are determined by near-ground flow conditions, and O3 sensitivity is found to shift from VOC-sensitive conditions to NOx-sensitive conditions from morning to afternoon in central and western areas of the PRD. Elevated surface O3 around mid-afternoon in October mainly occurred in VOC-sensitive regions or those NOx-limited areas in close vicinity of the VOC-sensitive regions. Ratios of H2O2/HNO3 and peroxides/HNO3 for indicating O3-precursor sensitivity are evaluated and the transition values of 0.45 for H2O2/HNO3 and 0.80 for peroxides/HNO3 were found, with an overall accuracy of about 92% for sensitivity identification at elevated O3 hours in afternoons during the campaign.
Highlights ► HDDM-3D is applied to assess O3–NOx–VOC sensitivities for the first time in the PRD. ► A spatially non-uniform & temporally dynamic O3 sensitivity is characterized in PRD. ► A revised nonlinearity ratio illustrates nonlinear features of O3 chemistry in PRD. ► A new method is proposed to identify the transition value of photochemical indicator. ► A transition value of 0.45 for H2O2/HNO3 is determined with overall accuracy of 92%.
Decoupled direct sensitivity analysis of regional ozone pollution over the Pearl River Delta during the PRIDE-PRD2004 campaign
Wang, Xuesong (author) / Zhang, Yuanhang (author) / Hu, Yongtao (author) / Zhou, Wei (author) / Zeng, Limin (author) / Hu, Min (author) / Cohan, Daniel S. (author) / Russell, Armistead G. (author)
Atmospheric Environment ; 45 ; 4941-4949
2011-06-01
9 pages
Article (Journal)
Electronic Resource
English
Photochemical indicators of ozone sensitivity: application in the Pearl River Delta, China
| Springer Verlag | 2016