{"title":"2015-2020 年间南京夏季臭氧的变化：气象、自由基链长度和臭氧生产效率的作用","authors":"Lin Li, Jingyi Li, Momei Qin, Xiaodong Xie, Jianlin Hu, Yuqiang Zhang","doi":"10.1007/s11783-024-1897-z","DOIUrl":null,"url":null,"abstract":"<p>Changes in ozone (O<sub>3</sub>) can be evaluated to inform policy effectiveness and develop reasonable emissions reduction measures. This study investigated the causes of summertime maximum daily 8-h average (MDA8) O<sub>3</sub> variation between 2015 and 2020 in Nanjing, China, a megacity in the Yangtze River Delta (YRD) region, from the perspective of meteorological conditions and anthropogenic emissions of O<sub>3</sub> precursors (VOCs and No<sub><i>x</i></sub>). Compared with 2015, the observed MDA8 O<sub>3</sub> decreased by 19.1 µg/m<sup>3</sup> in August 2020. The indirect and indirect impacts of meteorological conditions contributed 44% of the decline, with temperature, relative humidity, and wind playing important roles in the O<sub>3</sub> variation. The O<sub>3</sub> drop by 10.7 µg/m<sup>3</sup> (56% of the total decrease) may have been due to the decreases in anthropogenic emissions of VOCs and NO<sub><i>x</i></sub> by 7.8% and 11.7%, respectively. The longer hydroxyl (OH) radical chain length and higher ozone production efficiency (OPE) indicated that the reduction of anthropogenic emissions accelerated the RO<sub><i>x</i></sub> (RO<sub><i>x</i></sub> = OH + HO<sub>2</sub> + RO<sub>2</sub>) and NO<sub><i>x</i></sub> cycles in O<sub>3</sub> production, making O<sub>3</sub> more sensitive to NO<sub><i>x</i></sub>. This corresponded to the O<sub>3</sub> formation shifting from a VOC-limited regime in 2015 to a transition regime in 2020 and O<sub>3</sub> decrease with anthropogenic emission reduction. Hence, the joint control of O<sub>3</sub> precursor emissions can effectively mitigate O<sub>3</sub> pollution in Nanjing.</p>","PeriodicalId":12720,"journal":{"name":"Frontiers of Environmental Science & Engineering","volume":null,"pages":null},"PeriodicalIF":6.1000,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Variations in summertime ozone in Nanjing between 2015 and 2020: roles of meteorology, radical chain length and ozone production efficiency\",\"authors\":\"Lin Li, Jingyi Li, Momei Qin, Xiaodong Xie, Jianlin Hu, Yuqiang Zhang\",\"doi\":\"10.1007/s11783-024-1897-z\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Changes in ozone (O<sub>3</sub>) can be evaluated to inform policy effectiveness and develop reasonable emissions reduction measures. This study investigated the causes of summertime maximum daily 8-h average (MDA8) O<sub>3</sub> variation between 2015 and 2020 in Nanjing, China, a megacity in the Yangtze River Delta (YRD) region, from the perspective of meteorological conditions and anthropogenic emissions of O<sub>3</sub> precursors (VOCs and No<sub><i>x</i></sub>). Compared with 2015, the observed MDA8 O<sub>3</sub> decreased by 19.1 µg/m<sup>3</sup> in August 2020. The indirect and indirect impacts of meteorological conditions contributed 44% of the decline, with temperature, relative humidity, and wind playing important roles in the O<sub>3</sub> variation. The O<sub>3</sub> drop by 10.7 µg/m<sup>3</sup> (56% of the total decrease) may have been due to the decreases in anthropogenic emissions of VOCs and NO<sub><i>x</i></sub> by 7.8% and 11.7%, respectively. The longer hydroxyl (OH) radical chain length and higher ozone production efficiency (OPE) indicated that the reduction of anthropogenic emissions accelerated the RO<sub><i>x</i></sub> (RO<sub><i>x</i></sub> = OH + HO<sub>2</sub> + RO<sub>2</sub>) and NO<sub><i>x</i></sub> cycles in O<sub>3</sub> production, making O<sub>3</sub> more sensitive to NO<sub><i>x</i></sub>. This corresponded to the O<sub>3</sub> formation shifting from a VOC-limited regime in 2015 to a transition regime in 2020 and O<sub>3</sub> decrease with anthropogenic emission reduction. Hence, the joint control of O<sub>3</sub> precursor emissions can effectively mitigate O<sub>3</sub> pollution in Nanjing.</p>\",\"PeriodicalId\":12720,\"journal\":{\"name\":\"Frontiers of Environmental Science & Engineering\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.1000,\"publicationDate\":\"2024-09-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Frontiers of Environmental Science & Engineering\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://doi.org/10.1007/s11783-024-1897-z\",\"RegionNum\":2,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, ENVIRONMENTAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Frontiers of Environmental Science & Engineering","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1007/s11783-024-1897-z","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
Variations in summertime ozone in Nanjing between 2015 and 2020: roles of meteorology, radical chain length and ozone production efficiency
Changes in ozone (O3) can be evaluated to inform policy effectiveness and develop reasonable emissions reduction measures. This study investigated the causes of summertime maximum daily 8-h average (MDA8) O3 variation between 2015 and 2020 in Nanjing, China, a megacity in the Yangtze River Delta (YRD) region, from the perspective of meteorological conditions and anthropogenic emissions of O3 precursors (VOCs and Nox). Compared with 2015, the observed MDA8 O3 decreased by 19.1 µg/m3 in August 2020. The indirect and indirect impacts of meteorological conditions contributed 44% of the decline, with temperature, relative humidity, and wind playing important roles in the O3 variation. The O3 drop by 10.7 µg/m3 (56% of the total decrease) may have been due to the decreases in anthropogenic emissions of VOCs and NOx by 7.8% and 11.7%, respectively. The longer hydroxyl (OH) radical chain length and higher ozone production efficiency (OPE) indicated that the reduction of anthropogenic emissions accelerated the ROx (ROx = OH + HO2 + RO2) and NOx cycles in O3 production, making O3 more sensitive to NOx. This corresponded to the O3 formation shifting from a VOC-limited regime in 2015 to a transition regime in 2020 and O3 decrease with anthropogenic emission reduction. Hence, the joint control of O3 precursor emissions can effectively mitigate O3 pollution in Nanjing.
期刊介绍：
Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines.
FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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