{"title":"Observations of NO3 and N2O5 in urban Beijing during APHH-Beijing campaign","authors":"Zhiyan Li, Dan Wang, Yuanyuan Qian, Hao Chen","doi":"10.1007/s11869-025-01776-7","DOIUrl":null,"url":null,"abstract":"<div><p>Nitrate radical (NO<sub>3</sub>) and dinitrogen pentoxide (N<sub>2</sub>O<sub>5</sub>) play an important role in nocturnal tropospheric chemistry. Here we present the measurements of gas-phase NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub> by a cavity ringdown spectroscopy (CRDS) instrument from June 2 to June 22, 2017.The measurement site was in an urban area of Beijing, China as a part of the Air Pollution and Human Health (APHH) campaign. N<sub>2</sub>O<sub>5</sub> and NO<sub>3</sub> showed large day-to-day variations with average (± 1<i>σ</i>) mixing ratios of 88.5 ± 101.7 pptv and 8.3 ± 6.5 pptv, respectively. The heterogeneous N<sub>2</sub>O<sub>5</sub> uptake coefficient (<i>γ</i>N<sub>2</sub>O<sub>5</sub>) was retrieved from steady-state analysis. The estimated N<sub>2</sub>O<sub>5</sub> uptake coefficient ranged from 0.045 to 0.109, with an average of 0.083 ± 0.027. Further analysis revealed that the average NO<sub>3</sub> reactivity by the reaction with volatile organic compounds (VOCs) was 0.024 s<sup>− 1</sup>. The oxidation of biologic volatile organic compounds (BVOCs) by NO<sub>3</sub> was an important pathway for the generations of organic nitrates (ONs) and secondary organic aerosols (SOA) at night. The ON production was 0.057 ppbv/h. The heterogeneous reaction of N<sub>2</sub>O<sub>5</sub> plays an important role in the formation of nitrate. The nitrate formations during the whole night were 24.05 ± 20.56 µg/m<sup>3</sup> in Beijing. We highlight the importance of NO<sub>3</sub> oxidation of VOCs in the formation of ON and subsequent secondary organic aerosols in summer in Beijing.</p></div>","PeriodicalId":49109,"journal":{"name":"Air Quality Atmosphere and Health","volume":"18 9","pages":"2643 - 2653"},"PeriodicalIF":2.9000,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Air Quality Atmosphere and Health","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s11869-025-01776-7","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Nitrate radical (NO3) and dinitrogen pentoxide (N2O5) play an important role in nocturnal tropospheric chemistry. Here we present the measurements of gas-phase NO3 and N2O5 by a cavity ringdown spectroscopy (CRDS) instrument from June 2 to June 22, 2017.The measurement site was in an urban area of Beijing, China as a part of the Air Pollution and Human Health (APHH) campaign. N2O5 and NO3 showed large day-to-day variations with average (± 1σ) mixing ratios of 88.5 ± 101.7 pptv and 8.3 ± 6.5 pptv, respectively. The heterogeneous N2O5 uptake coefficient (γN2O5) was retrieved from steady-state analysis. The estimated N2O5 uptake coefficient ranged from 0.045 to 0.109, with an average of 0.083 ± 0.027. Further analysis revealed that the average NO3 reactivity by the reaction with volatile organic compounds (VOCs) was 0.024 s− 1. The oxidation of biologic volatile organic compounds (BVOCs) by NO3 was an important pathway for the generations of organic nitrates (ONs) and secondary organic aerosols (SOA) at night. The ON production was 0.057 ppbv/h. The heterogeneous reaction of N2O5 plays an important role in the formation of nitrate. The nitrate formations during the whole night were 24.05 ± 20.56 µg/m3 in Beijing. We highlight the importance of NO3 oxidation of VOCs in the formation of ON and subsequent secondary organic aerosols in summer in Beijing.
期刊介绍：
Air Quality, Atmosphere, and Health is a multidisciplinary journal which, by its very name, illustrates the broad range of work it publishes and which focuses on atmospheric consequences of human activities and their implications for human and ecological health.
It offers research papers, critical literature reviews and commentaries, as well as special issues devoted to topical subjects or themes.
International in scope, the journal presents papers that inform and stimulate a global readership, as the topic addressed are global in their import. Consequently, we do not encourage submission of papers involving local data that relate to local problems. Unless they demonstrate wide applicability, these are better submitted to national or regional journals.
Air Quality, Atmosphere & Health addresses such topics as acid precipitation; airborne particulate matter; air quality monitoring and management; exposure assessment; risk assessment; indoor air quality; atmospheric chemistry; atmospheric modeling and prediction; air pollution climatology; climate change and air quality; air pollution measurement; atmospheric impact assessment; forest-fire emissions; atmospheric science; greenhouse gases; health and ecological effects; clean air technology; regional and global change and satellite measurements.
This journal benefits a diverse audience of researchers, public health officials and policy makers addressing problems that call for solutions based in evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publication in the journal affords the opportunity to reach beyond defined disciplinary niches to this broader readership.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
