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基于转置EKMA曲线的湖南省臭氧生成敏感性分析
Study of Ozone Formation Sensitivity in Hunan Province Based on the Transformed-EKMA Curve Approach
投稿时间:2022-05-12  修订日期:2022-07-13
DOI:10.19316/j.issn.1002-6002.2023.05.11
中文关键词:  臭氧  转置EKMA曲线  臭氧生成敏感性
英文关键词:O3  transformed-EKMA curve  O3 formation sensitivity
基金项目:湖南省重点领域研发计划项目"长株潭区域大气细颗粒物污染成因解析及防治关键技术研究与应用示范"(2019SK2071);广州市科技计划项目(202102021308)
作者单位
张琴 湖南省生态环境监测中心, 湖南 长沙 410019 
莫慧偲 广州市香港科大霍英东研究院大气研究中心, 广东 广州 511458 
周国治 湖南省生态环境监测中心, 湖南 长沙 410019 
潘海婷 湖南省生态环境监测中心, 湖南 长沙 410019 
黄河仙 湖南省生态环境监测中心, 湖南 长沙 410019 
姚腾 香港科技大学环境与可持续发展学部, 香港 999077 
颜炜琳* 广州市香港科大霍英东研究院大气研究中心, 广东 广州 511458 
通讯作者:颜炜琳*  广州市香港科大霍英东研究院大气研究中心, 广东 广州 511458  
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中文摘要:
      基于湖南省2015—2020年夏秋季的污染物及气象观测数据,分析了臭氧(O3)污染的时空特征和生成敏感性。湖南省中部和北部的O3污染较为严重,且主要发生在9月,午后O3峰值常与早高峰的NO2浓度有较高的相关性。采用转置EKMA曲线方法探究了O3在NO2维度和VOCs反应活性维度下的生成敏感性。在 NO2维度下,NO2控制区和NO2-VOCs过渡区的NO2质量浓度为7 ~ 13 μg/m3,NO2-VOCs过渡区和VOCs控制区的NO2质量浓度为15~17 μg/m3。在VOCs反应活性维度下,当NO2质量浓度大于10 μg/m3时,VOCs反应活性越高,O3浓度越高。在高VOCs反应活性(30 ℃或以上)时,NO2浓度每降低1 μg/m3,各区域的O3质量浓度能降低约8 ~ 9 μg/m3。结合NO2 和VOCs反应活性2个维度,得出湖南省午后O3生成以 NO2控制区和NO2-VOCs 过渡区为主,在晴天干燥和高温条件下,减排NO2可有效降低O3浓度。转置EKMA曲线方法为缺少长期VOCs观测的区域提供了研究O3生成敏感性的新思路。
英文摘要:
      The temporal and spatial variation characteristics of ozone (O3) pollution and the sensitivity of O3 formation were investigated,based on the air quality and meteorology observation in summer and autumn from 2015 to 2020 in Hunan Province.O3 pollution mainly emerged in the central and northern parts of Hunan Province and usually occurred in September.The peak concentration of O3 in the afternoon was highly correlated with the NO2 concentration in the morning.With the transformed-EKMA curve approach,the sensitivity of O3 formation to both NO2 concentration and the total reactivity of VOCs were analyzed.In terms of NO2 concentration,the dividing NO2 concentration of the NO2-limited and the NO2-VOCs-transitional regime,the NO2-VOCs-transitional and the VOCs-limited regime were each located between 7-13 μg/m3 and 15-17 μg/m3.In terms of the total reactivity of VOCs,the higher the total reactivity of VOCs,the higher the O3 concentration when the NO2 concentration was above 10 μg/m3.When the temperature was above 30℃,the O3 concentration would be diminished by 8 to 9 μg/m3 as the NO2 concentration decreased by 1 μg/m3.In conclusion,the O3 formation at 14:00 in summer and autumn was mainly under the NO2-limited or the NO2-VOCs-transitional regime,suggesting that the emission reduction of NO2 could effectively control O3 pollution on high temperature days in Hunan Province.For regions lacking long-term VOCs observation,a new insight into the analysis of the O3 formation sensitivity was provided.
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