Characterization of nitrous acid and its potential effects on secondary pollution in the warm season in Beijing urban areas
<p>As a key source of hydroxyl (OH) radicals, nitrous acid (HONO) has attracted much attention for its important role in the atmospheric oxidant capacity (AOC) increase. In this study, we made a comparison of the ambient levels, variation patterns, sources, and formation pathway in the warm se...
Saved in:
| Main Authors: | , , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2025-02-01
|
| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/25/2551/2025/acp-25-2551-2025.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850077583328149504 |
|---|---|
| author | J. Li C. Lian C. Lian M. Liu H. Zhang Y. Yan Y. Song C. Chen J. Wang H. Zhang Y. Ren Y. Guo W. Wang Y. Xu H. Li J. Gao M. Ge |
| author_facet | J. Li C. Lian C. Lian M. Liu H. Zhang Y. Yan Y. Song C. Chen J. Wang H. Zhang Y. Ren Y. Guo W. Wang Y. Xu H. Li J. Gao M. Ge |
| author_sort | J. Li |
| collection | DOAJ |
| description | <p>As a key source of hydroxyl (OH) radicals, nitrous acid (HONO) has attracted much attention for its important role in the atmospheric oxidant capacity (AOC) increase. In this study, we made a comparison of the ambient levels, variation patterns, sources, and formation pathway in the warm season (from June to October in 2021) on the basis of a continuous intensive observation in an urban site of Beijing. The monthly average mixing ratios of HONO were 1.3, 1.3, 1.0, 0.96, and 0.89 <span class="inline-formula">ppb</span>, respectively, showing a larger contribution to OH radicals relative to ozone in the daytime. The emission factor (EF) relative to <span class="inline-formula">NO<sub><i>x</i></sub></span> from the vehicle emissions was estimated to be 0.017, higher than most studies conducted in Beijing. The average nocturnal <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M3" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msub><mi mathvariant="normal">NO</mi><mn mathvariant="normal">2</mn></msub><mo>/</mo><mi mathvariant="normal">HONO</mi></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="62pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="612f9684084736b5e9166c390ca162ab"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-25-2551-2025-ie00001.svg" width="62pt" height="14pt" src="acp-25-2551-2025-ie00001.png"/></svg:svg></span></span> conversion frequency <span class="inline-formula"><i>k</i><sub>HONO</sub></span> was 0.008 <span class="inline-formula">h<sup>−1</sup></span>. In the warm season, the missing source of HONO, <span class="inline-formula"><i>P</i><sub>unknown</sub></span>, around noontime was 0.29–2.7 <span class="inline-formula">ppb h<sup>−1</sup></span>. According to the OH production from HONO, the OH production rate from the missing HONO was also very important to the AOC. This work highlights the importance of HONO for the AOC in the warm season, while encouraging long-term HONO observation to assess the contribution of HONO sources over time compared to the capture of pollution processes.</p> |
| format | Article |
| id | doaj-art-0c2c149a9fd94404b7c8aaa24ca82ba9 |
| institution | DOAJ |
| issn | 1680-7316 1680-7324 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj-art-0c2c149a9fd94404b7c8aaa24ca82ba92025-08-20T02:45:46ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242025-02-01252551256810.5194/acp-25-2551-2025Characterization of nitrous acid and its potential effects on secondary pollution in the warm season in Beijing urban areasJ. Li0C. Lian1C. Lian2M. Liu3H. Zhang4Y. Yan5Y. Song6C. Chen7J. Wang8H. Zhang9Y. Ren10Y. Guo11W. Wang12Y. Xu13H. Li14J. Gao15M. Ge16State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, Chinanow at: Assessment and Research Center for Pollution and Carbon Reduction, Tianfu Yongxing Laboratory, Chengdu 610213, ChinaChina National Environmental Monitoring Centre, Beijing 100012, ChinaState Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, ChinaState Key Laboratory for Structural Chemistry of Unstable and Stable Species, Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China<p>As a key source of hydroxyl (OH) radicals, nitrous acid (HONO) has attracted much attention for its important role in the atmospheric oxidant capacity (AOC) increase. In this study, we made a comparison of the ambient levels, variation patterns, sources, and formation pathway in the warm season (from June to October in 2021) on the basis of a continuous intensive observation in an urban site of Beijing. The monthly average mixing ratios of HONO were 1.3, 1.3, 1.0, 0.96, and 0.89 <span class="inline-formula">ppb</span>, respectively, showing a larger contribution to OH radicals relative to ozone in the daytime. The emission factor (EF) relative to <span class="inline-formula">NO<sub><i>x</i></sub></span> from the vehicle emissions was estimated to be 0.017, higher than most studies conducted in Beijing. The average nocturnal <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M3" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msub><mi mathvariant="normal">NO</mi><mn mathvariant="normal">2</mn></msub><mo>/</mo><mi mathvariant="normal">HONO</mi></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="62pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="612f9684084736b5e9166c390ca162ab"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-25-2551-2025-ie00001.svg" width="62pt" height="14pt" src="acp-25-2551-2025-ie00001.png"/></svg:svg></span></span> conversion frequency <span class="inline-formula"><i>k</i><sub>HONO</sub></span> was 0.008 <span class="inline-formula">h<sup>−1</sup></span>. In the warm season, the missing source of HONO, <span class="inline-formula"><i>P</i><sub>unknown</sub></span>, around noontime was 0.29–2.7 <span class="inline-formula">ppb h<sup>−1</sup></span>. According to the OH production from HONO, the OH production rate from the missing HONO was also very important to the AOC. This work highlights the importance of HONO for the AOC in the warm season, while encouraging long-term HONO observation to assess the contribution of HONO sources over time compared to the capture of pollution processes.</p>https://acp.copernicus.org/articles/25/2551/2025/acp-25-2551-2025.pdf |
| spellingShingle | J. Li C. Lian C. Lian M. Liu H. Zhang Y. Yan Y. Song C. Chen J. Wang H. Zhang Y. Ren Y. Guo W. Wang Y. Xu H. Li J. Gao M. Ge Characterization of nitrous acid and its potential effects on secondary pollution in the warm season in Beijing urban areas Atmospheric Chemistry and Physics |
| title | Characterization of nitrous acid and its potential effects on secondary pollution in the warm season in Beijing urban areas |
| title_full | Characterization of nitrous acid and its potential effects on secondary pollution in the warm season in Beijing urban areas |
| title_fullStr | Characterization of nitrous acid and its potential effects on secondary pollution in the warm season in Beijing urban areas |
| title_full_unstemmed | Characterization of nitrous acid and its potential effects on secondary pollution in the warm season in Beijing urban areas |
| title_short | Characterization of nitrous acid and its potential effects on secondary pollution in the warm season in Beijing urban areas |
| title_sort | characterization of nitrous acid and its potential effects on secondary pollution in the warm season in beijing urban areas |
| url | https://acp.copernicus.org/articles/25/2551/2025/acp-25-2551-2025.pdf |
| work_keys_str_mv | AT jli characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT clian characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT clian characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT mliu characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT hzhang characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT yyan characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT ysong characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT cchen characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT jwang characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT hzhang characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT yren characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT yguo characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT wwang characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT yxu characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT hli characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT jgao characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas AT mge characterizationofnitrousacidanditspotentialeffectsonsecondarypollutioninthewarmseasoninbeijingurbanareas |