保定市夏季臭氧生成敏感性及前体物减排方案

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摘要基于2015~2019年7月保定市常规污染物和气象观测数据,研究分析了保定市夏季O₃污染特征及其与气象因子的响应关系;结合WRF-CMAQ模式和EKMA曲线法研究确定了保定地区O₃敏感性特征及前体物(NOx与VOCs)的减排方案.结果表明,2015~2019年7月MDA8O₃平均浓度在138~179μg/m³之间;相较2015年,2019年7月O₃日最大8h平均浓度(MDA8O₃)平均浓度上升了10.5%;主要气象因子中,O₃与温度呈正相关,与相对湿度呈负相关,且在O₃超标日时,相关性更强,分别为0.81和-0.70;在O₃超标日下,当风向为西风、西南风、南风和东南风时,O₃小时浓度更容易出现高值;保定市主城区、南部及东部区县属于VOCs控制区,西部和北部区县属于VOCs和NOx协同控制区.对于以城区为代表的VOCs控制区,建议优先减排VOCs;对于西部和北部郊县建议NOx:VOCs减排比例大于1.

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	张新宇
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关键词 ：保定市, 臭氧, WRF-CMAQ, 敏感性分析, 减排方案

Abstract：Based on the datasets of air pollutant concentrations and meteorological conditions of Baoding from 2015 to July 2019, the relationship between O₃ characteristics and meteorological factors in summer season was analyzed. The O₃ sensitivity and the reduction scheme of precursors (NOx and VOCs) emissions was determined combining WRF-CMAQ simulations and EKMA curve. Results indicated that monthly average concentrations of MDA8O₃ in July from 2015 to 2019 ranged from 138 to 179μg/m³. Compared with 2015, the average concentration of MDA8O₃ in July 2019 increased by 10.5%. Among the major meteorological factors, the ozone concentration was positively correlated with temperature (R=0.81 on nonattainment days) and negatively correlated with relative humidity (R=-0.70 on nonattainment days). And higher concentration of O₃ mainly occurred accompanied with west wind, southwest wind, south wind and southeast wind. Ozone formation was in the strong VOCs-limited regime in the main urban, southern and eastern suburban of Baoding city, however, it was in the NO_x and VOCs transition regime in the western and northern suburban. Thus, it was suggested that the reduction of VOCs emissions should be priority considered in VOCs-limited regime regions. As for the western and northern suburban, the reduction ratio of NO_x: VOCs should be larger than 1.

Key words： Baoding City ozone WRF-CMAQ sensitivity analysis emission reduction scheme

收稿日期: 2022-11-03

PACS:

X511

基金资助:国家自然科学基金资助项目(52000005)

通讯作者: 王晓琦,助理研究员,wangxq@bjut.edu.cn E-mail: wangxq@bjut.edu.cn

作者简介: 张新宇(1997-),男,河北邯郸人,北京工业大学硕士研究生,主要从事环境规划管理与污染防治方面的研究.发表论文1篇.zhangxinyu@emails.bjut.edu.cn

引用本文:

张新宇, 王晓琦, 王传达, 张俊峰. 保定市夏季臭氧生成敏感性及前体物减排方案[J]. 中国环境科学, 2023, 43(6): 2703-2713. ZHANG Xin-yu, WANG Xiao-qi, WANG Chuan-da, ZHANG Jun-feng. Ozone sensitivity and precursor emission reduction scheme in Baoding City in summer. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2703-2713.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I6/2703

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