Night-time measurements of HO<sub><i>x</i></sub> during the RONOCO project and analysis of the sources of HO<sub>2</sub>
Measurements of the radical species OH and HO<sub>2</sub> were made using the fluorescence assay by gas expansion (FAGE) technique during a series of night-time and daytime flights over the UK in summer 2010 and winter 2011. OH was not detected above the instrument's 1σ li...
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| Format: | Article |
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Copernicus Publications
2015-07-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/15/8179/2015/acp-15-8179-2015.pdf |
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| author | H. M. Walker D. Stone T. Ingham S. Vaughan M. Cain R. L. Jones O. J. Kennedy M. McLeod B. Ouyang J. Pyle S. Bauguitte B. Bandy G. Forster M. J. Evans J. F. Hamilton J. R. Hopkins J. D. Lee A. C. Lewis R. T. Lidster S. Punjabi W. T. Morgan D. E. Heard |
| author_facet | H. M. Walker D. Stone T. Ingham S. Vaughan M. Cain R. L. Jones O. J. Kennedy M. McLeod B. Ouyang J. Pyle S. Bauguitte B. Bandy G. Forster M. J. Evans J. F. Hamilton J. R. Hopkins J. D. Lee A. C. Lewis R. T. Lidster S. Punjabi W. T. Morgan D. E. Heard |
| author_sort | H. M. Walker |
| collection | DOAJ |
| description | Measurements of the radical species OH and HO<sub>2</sub> were
made using the fluorescence assay by gas expansion (FAGE) technique during a
series of night-time and daytime flights over the UK in summer 2010 and
winter 2011. OH was not detected above the instrument's 1σ limit of
detection during any of the night-time flights or during the winter daytime
flights, placing upper limits on [OH] of
1.8 × 10<sup>6</sup> molecule cm<sup>−3</sup> and
6.4 × 10<sup>5</sup> molecule cm<sup>−3</sup> for the summer and winter
flights, respectively. HO<sub>2</sub> reached a maximum concentration of
3.2 × 10<sup>8</sup> molecule cm<sup>−3</sup> (13.6 pptv) during a night-time
flight on 20 July 2010, when the highest concentrations of NO<sub>3</sub> and
O<sub>3</sub> were also recorded. An analysis of the rates of reaction of OH,
O<sub>3</sub>, and the NO<sub>3</sub> radical with measured alkenes indicates that the
summer night-time troposphere can be as important for the processing of
volatile organic compounds (VOCs) as the winter daytime troposphere. An
analysis of the instantaneous rate of production of HO<sub>2</sub> from the
reactions of O<sub>3</sub> and NO<sub>3</sub> with alkenes has shown that, on average,
reactions of NO<sub>3</sub> dominated the night-time production of HO<sub>2</sub> during
summer and reactions of O<sub>3</sub> dominated the night-time HO<sub>2</sub> production
during winter. |
| first_indexed | 2024-12-22T15:00:37Z |
| format | Article |
| id | doaj.art-c19f0f135be7453db9cd7635baa99567 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-22T15:00:37Z |
| publishDate | 2015-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-c19f0f135be7453db9cd7635baa995672022-12-21T18:22:08ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242015-07-0115148179820010.5194/acp-15-8179-2015Night-time measurements of HO<sub><i>x</i></sub> during the RONOCO project and analysis of the sources of HO<sub>2</sub>H. M. Walker0D. Stone1T. Ingham2S. Vaughan3M. Cain4R. L. Jones5O. J. Kennedy6M. McLeod7B. Ouyang8J. Pyle9S. Bauguitte10B. Bandy11G. Forster12M. J. Evans13J. F. Hamilton14J. R. Hopkins15J. D. Lee16A. C. Lewis17R. T. Lidster18S. Punjabi19W. T. Morgan20D. E. Heard21School of Chemistry, University of Leeds, Leeds, UKSchool of Chemistry, University of Leeds, Leeds, UKSchool of Chemistry, University of Leeds, Leeds, UKSchool of Chemistry, University of Leeds, Leeds, UKDepartment of Chemistry, University of Cambridge, Cambridge, UKDepartment of Chemistry, University of Cambridge, Cambridge, UKDepartment of Chemistry, University of Cambridge, Cambridge, UKDepartment of Chemistry, University of Cambridge, Cambridge, UKDepartment of Chemistry, University of Cambridge, Cambridge, UKDepartment of Chemistry, University of Cambridge, Cambridge, UKFacility for Airborne Atmospheric Measurements (FAAM), Cranfield University, Cranfield, UKCentre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, UKCentre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, UKWolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UKWolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UKWolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UKWolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UKWolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UKWolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UKWolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, UKSchool of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, UKSchool of Chemistry, University of Leeds, Leeds, UKMeasurements of the radical species OH and HO<sub>2</sub> were made using the fluorescence assay by gas expansion (FAGE) technique during a series of night-time and daytime flights over the UK in summer 2010 and winter 2011. OH was not detected above the instrument's 1σ limit of detection during any of the night-time flights or during the winter daytime flights, placing upper limits on [OH] of 1.8 × 10<sup>6</sup> molecule cm<sup>−3</sup> and 6.4 × 10<sup>5</sup> molecule cm<sup>−3</sup> for the summer and winter flights, respectively. HO<sub>2</sub> reached a maximum concentration of 3.2 × 10<sup>8</sup> molecule cm<sup>−3</sup> (13.6 pptv) during a night-time flight on 20 July 2010, when the highest concentrations of NO<sub>3</sub> and O<sub>3</sub> were also recorded. An analysis of the rates of reaction of OH, O<sub>3</sub>, and the NO<sub>3</sub> radical with measured alkenes indicates that the summer night-time troposphere can be as important for the processing of volatile organic compounds (VOCs) as the winter daytime troposphere. An analysis of the instantaneous rate of production of HO<sub>2</sub> from the reactions of O<sub>3</sub> and NO<sub>3</sub> with alkenes has shown that, on average, reactions of NO<sub>3</sub> dominated the night-time production of HO<sub>2</sub> during summer and reactions of O<sub>3</sub> dominated the night-time HO<sub>2</sub> production during winter.http://www.atmos-chem-phys.net/15/8179/2015/acp-15-8179-2015.pdf |
| spellingShingle | H. M. Walker D. Stone T. Ingham S. Vaughan M. Cain R. L. Jones O. J. Kennedy M. McLeod B. Ouyang J. Pyle S. Bauguitte B. Bandy G. Forster M. J. Evans J. F. Hamilton J. R. Hopkins J. D. Lee A. C. Lewis R. T. Lidster S. Punjabi W. T. Morgan D. E. Heard Night-time measurements of HO<sub><i>x</i></sub> during the RONOCO project and analysis of the sources of HO<sub>2</sub> Atmospheric Chemistry and Physics |
| title | Night-time measurements of HO<sub><i>x</i></sub> during the RONOCO project and analysis of the sources of HO<sub>2</sub> |
| title_full | Night-time measurements of HO<sub><i>x</i></sub> during the RONOCO project and analysis of the sources of HO<sub>2</sub> |
| title_fullStr | Night-time measurements of HO<sub><i>x</i></sub> during the RONOCO project and analysis of the sources of HO<sub>2</sub> |
| title_full_unstemmed | Night-time measurements of HO<sub><i>x</i></sub> during the RONOCO project and analysis of the sources of HO<sub>2</sub> |
| title_short | Night-time measurements of HO<sub><i>x</i></sub> during the RONOCO project and analysis of the sources of HO<sub>2</sub> |
| title_sort | night time measurements of ho sub i x i sub during the ronoco project and analysis of the sources of ho sub 2 sub |
| url | http://www.atmos-chem-phys.net/15/8179/2015/acp-15-8179-2015.pdf |
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