Qing-Qing Yu, Wei-Qiang Yang, Cheng-Lei Pei, Xin-Ming Wang
{"title":"[珠江三角洲夏秋过渡季节臭氧污染及前体物质控制策略分析]。","authors":"Qing-Qing Yu, Wei-Qiang Yang, Cheng-Lei Pei, Xin-Ming Wang","doi":"10.13227/j.hjkx.202310051","DOIUrl":null,"url":null,"abstract":"<p><p>To analyze the causes of ozone pollution in the Pearl River Delta (PRD) Region during the summer and autumn transition seasons, a case study was carried out in Guangzhou, which is located in the center of the PRD Region, to analyze the ozone photochemical production and destruction pathways as well as emission reduction scenarios using a box model based on comprehensive observation. The results showed that the stagnant meteorological conditions and high temperature during the observation period were suitable for the photochemical production of ozone, which led to widespread and prolonged ozone pollution. Aromatic hydrocarbons (AHs) contributed the most to the ozone formation potential (OFP), and <i>m</i>/<i>p</i>-xylene, toluene, and <i>o</i>-xylene were the major three VOC species contributing to the OFP. Box model analysis revealed that the averaged net O<sub>3</sub> production rate during the polluted period was 23.2×10<sup>-9</sup> h<sup>-1</sup> and the peak reached 39.2×10<sup>-9</sup> h<sup>-1</sup>. The HO<sub>2</sub>·+NO and NO<sub>2</sub>+·OH reaction pathways contributed the most to the local photochemical ozone production (51.2%) and destruction (47.0%), respectively. Observed ozone concentration was primarily controlled by both the local photochemical O<sub>3</sub> production and the export-dominated transport. The RIR and EKMA analyses showed that O<sub>3</sub> formation in Guangzhou during the summer-autumn transition seasons was mainly a VOC-limited regime and AHs showed the greatest sensitivity to O<sub>3</sub> production. Toluene, <i>m</i>/<i>p</i>-xylene, <i>o</i>-xylene, <i>n</i>-butane, and propylene were the five key components affecting O<sub>3</sub> generation. The analysis of reduction scenarios showed that reducing anthropogenic VOC emissions was the most favorable way to reduce O<sub>3</sub> concentrations; however, if NO<i><sub>x</sub></i> emission was controlled after reducing VOCs, the O<sub>3</sub> concentration would rebound in a short time. Our results suggested that the synergistic reduction of VOCs and NO<i><sub>x</sub></i> while mainly focusing on VOCs alleviation should be implemented to continuously reduce ozone concentrations in the future.</p>","PeriodicalId":35937,"journal":{"name":"Huanjing Kexue/Environmental Science","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"[Analysis of Ozone Pollution and Precursor Control Strategies in the Pearl River Delta During Summer and Autumn Transition Season].\",\"authors\":\"Qing-Qing Yu, Wei-Qiang Yang, Cheng-Lei Pei, Xin-Ming Wang\",\"doi\":\"10.13227/j.hjkx.202310051\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>To analyze the causes of ozone pollution in the Pearl River Delta (PRD) Region during the summer and autumn transition seasons, a case study was carried out in Guangzhou, which is located in the center of the PRD Region, to analyze the ozone photochemical production and destruction pathways as well as emission reduction scenarios using a box model based on comprehensive observation. The results showed that the stagnant meteorological conditions and high temperature during the observation period were suitable for the photochemical production of ozone, which led to widespread and prolonged ozone pollution. Aromatic hydrocarbons (AHs) contributed the most to the ozone formation potential (OFP), and <i>m</i>/<i>p</i>-xylene, toluene, and <i>o</i>-xylene were the major three VOC species contributing to the OFP. Box model analysis revealed that the averaged net O<sub>3</sub> production rate during the polluted period was 23.2×10<sup>-9</sup> h<sup>-1</sup> and the peak reached 39.2×10<sup>-9</sup> h<sup>-1</sup>. The HO<sub>2</sub>·+NO and NO<sub>2</sub>+·OH reaction pathways contributed the most to the local photochemical ozone production (51.2%) and destruction (47.0%), respectively. Observed ozone concentration was primarily controlled by both the local photochemical O<sub>3</sub> production and the export-dominated transport. The RIR and EKMA analyses showed that O<sub>3</sub> formation in Guangzhou during the summer-autumn transition seasons was mainly a VOC-limited regime and AHs showed the greatest sensitivity to O<sub>3</sub> production. Toluene, <i>m</i>/<i>p</i>-xylene, <i>o</i>-xylene, <i>n</i>-butane, and propylene were the five key components affecting O<sub>3</sub> generation. The analysis of reduction scenarios showed that reducing anthropogenic VOC emissions was the most favorable way to reduce O<sub>3</sub> concentrations; however, if NO<i><sub>x</sub></i> emission was controlled after reducing VOCs, the O<sub>3</sub> concentration would rebound in a short time. Our results suggested that the synergistic reduction of VOCs and NO<i><sub>x</sub></i> while mainly focusing on VOCs alleviation should be implemented to continuously reduce ozone concentrations in the future.</p>\",\"PeriodicalId\":35937,\"journal\":{\"name\":\"Huanjing Kexue/Environmental Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-10-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Huanjing Kexue/Environmental Science\",\"FirstCategoryId\":\"1087\",\"ListUrlMain\":\"https://doi.org/10.13227/j.hjkx.202310051\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"Environmental Science\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Huanjing Kexue/Environmental Science","FirstCategoryId":"1087","ListUrlMain":"https://doi.org/10.13227/j.hjkx.202310051","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"Environmental Science","Score":null,"Total":0}
[Analysis of Ozone Pollution and Precursor Control Strategies in the Pearl River Delta During Summer and Autumn Transition Season].
To analyze the causes of ozone pollution in the Pearl River Delta (PRD) Region during the summer and autumn transition seasons, a case study was carried out in Guangzhou, which is located in the center of the PRD Region, to analyze the ozone photochemical production and destruction pathways as well as emission reduction scenarios using a box model based on comprehensive observation. The results showed that the stagnant meteorological conditions and high temperature during the observation period were suitable for the photochemical production of ozone, which led to widespread and prolonged ozone pollution. Aromatic hydrocarbons (AHs) contributed the most to the ozone formation potential (OFP), and m/p-xylene, toluene, and o-xylene were the major three VOC species contributing to the OFP. Box model analysis revealed that the averaged net O3 production rate during the polluted period was 23.2×10-9 h-1 and the peak reached 39.2×10-9 h-1. The HO2·+NO and NO2+·OH reaction pathways contributed the most to the local photochemical ozone production (51.2%) and destruction (47.0%), respectively. Observed ozone concentration was primarily controlled by both the local photochemical O3 production and the export-dominated transport. The RIR and EKMA analyses showed that O3 formation in Guangzhou during the summer-autumn transition seasons was mainly a VOC-limited regime and AHs showed the greatest sensitivity to O3 production. Toluene, m/p-xylene, o-xylene, n-butane, and propylene were the five key components affecting O3 generation. The analysis of reduction scenarios showed that reducing anthropogenic VOC emissions was the most favorable way to reduce O3 concentrations; however, if NOx emission was controlled after reducing VOCs, the O3 concentration would rebound in a short time. Our results suggested that the synergistic reduction of VOCs and NOx while mainly focusing on VOCs alleviation should be implemented to continuously reduce ozone concentrations in the future.