Observations and modeling of OH and HO2 radicals in Chengdu, China in summer 2019
文献类型：期刊论文
| 作者 | Yang, Xinping2,3; Lu, Keding2,3; Ma, Xuefei2,3; Liu, Yanhui2,3; Wang, Haichao2,3; Hu, Renzhi4 ; Li, Xin2,3; Lou, Shengrong5; Chen, Shiyi2,3; Dong, Huabin2,3
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| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
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| 出版日期 | 2021-06-10 |
| 卷号 | 772 |
| ISSN号 | 0048-9697 |
| 关键词 | OH and HO2 radicals Closure experiment ROx budget Radical chain length |
| DOI | 10.1016/j.scitotenv.2020.144829 |
| 通讯作者 | Lu, Keding(k.lu@pku.edu.cn) ; Hu, Renzhi(rzhu@aiofm.ac.cn) ; Zhang, Yuanhang(yhzhang@pku.edu.cn) |
| 英文摘要 | This study reports on the first continuous measurements of ambient OH and HO2 radicals at a suburban site in Chengdu, Southwest China, which were collected during 2019 as part of a comprehensive field campaign 'CompreHensive field experiment to explOre the photochemical Ozone formation mechaniSm in summEr - 2019 (CHOOSE-2019)'. The mean concentrations (11:00-15:00) of the observed OH and HO2 radicals were 9.5 x 10(6) and 9.0 x 10(8) cm(3), respectively. To investigate the state-of-the-art chemical mechanism of radical, closure experiments were conducted with a box model, in which the RACM2 mechanism updated with the latest isoprene chemistry (RACM2-LIM1) was used. In the base run, OH radicals were underestimated by the model for the low-NO regime, which was likely due to the missing OH recycling. However, good agreement between the observed and modeled OH concentrations was achieved when an additional species X (equivalent to 0.25 ppb of NO mixing ratio) from one new OH regeneration cycle (RO2 + X -> HO2, HO2 + X -> OH) was added into the model. Additionally, in the base run, the model could reproduce the observed HO2 concentrations. Discrepancies in the observed and modeled HO2 concentrations were found in the sensitivity runs with HO2 heterogeneous uptake, indicating that the impact of the uptake may be less significant in Chengdu because of the relatively low aerosol concentrations. The ROx (= OH - HO2 + RO2) primary source was dominated by photolysis reactions, in which HONO, O-3, and HCHO photolysis accounted for 34%,19%, and 23% during the daytime, respectively. The efficiency of radical cycling was quantified by the radical chain length, which was determined by the NO to NO2 ratio successfully. The parameterization of the radical chain length may be very useful for the further determinations of radical recycling. (C) 2021 Elsevier B.V. All rights reserved. |
| 资助项目 | National Key R&D Program of China[2017YFC0209400] ; Beijing Municipal Natural Science Foundation for Distinguished Young Scholars[JQ19031] ; National Natural Science Foundation of China[21976006] ; National Natural Science Foundation of China[21522701] ; National Natural Science Foundation of China[91544225] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000628753700011 |
| 资助机构 | National Key R&D Program of China ; Beijing Municipal Natural Science Foundation for Distinguished Young Scholars ; National Natural Science Foundation of China |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/121452]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Lu, Keding; Hu, Renzhi; Zhang, Yuanhang |
| 作者单位 | 1.Peking Univ, Beijing Innovat Ctr Engn Sci & Adv Technol, Beijing, Peoples R China 2.Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing, Peoples R China 3.Peking Univ, Int Joint Lab Reg Pollut Control JRC, Beijing, Peoples R China 4.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei, Peoples R China 5.Shanghai Acad Environm Sci, State Environm Protect Key Lab Format & Prevent U, Shanghai, Peoples R China 6.Forschungszentrum Juelich GmbH, IEK Troposphere 8, Inst Energy & Climate Res, Julich, Germany 7.Chinese Acad Sci, CAS Ctr Excellence Reg Atmospher Environm, Xiamen, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Xinping,Lu, Keding,Ma, Xuefei,et al. Observations and modeling of OH and HO2 radicals in Chengdu, China in summer 2019[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,772. |
| APA | Yang, Xinping.,Lu, Keding.,Ma, Xuefei.,Liu, Yanhui.,Wang, Haichao.,...&Zhang, Yuanhang.(2021).Observations and modeling of OH and HO2 radicals in Chengdu, China in summer 2019.SCIENCE OF THE TOTAL ENVIRONMENT,772. |
| MLA | Yang, Xinping,et al."Observations and modeling of OH and HO2 radicals in Chengdu, China in summer 2019".SCIENCE OF THE TOTAL ENVIRONMENT 772(2021). |
入库方式： OAI收割
来源：合肥物质科学研究院
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