Decoupled direct sensitivity analysis of regional ozone pollution over the Pearl River Delta during the PRIDE-PRD2004 campaign

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• 作者：Xuesong Wang^a ; Yuanhang Zhang^a ; ^{yhzhang@pku.edu.cn"" rel=""nofollow} ; Yongtao Hu^b ; Wei Zhou^a ; ^c ; Limin Zeng^a ; Min Hu^a ; Daniel S. Cohan^c ; Armistead G. Russell^b
• 关键词：Ozone ; CMAQ ; Decoupled direct method ; Photochemical indicator ; Pearl River Delta
• 刊名：Atmospheric Environment
• 出版年：2011
• 出版时间：September 2011
• 年：2011
• 卷：45
• 期：28
• 页码：4941-4949
• 全文大小：1526 K

文摘

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 NO_x-inhibited chemistry along the polluted plumes in central and southern PRD areas, and a NO_x-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 NO_x- and VOC-sensitive regimes are determined by near-ground flow conditions, and O₃ sensitivity is found to shift from VOC-sensitive conditions to NO_x-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 NO_x-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.