Observations of OH and HO2 radicals in coastal Antarctica
OH and HO2 radical concentrations have been measured in the boundary layer of coastal Antarctica for a six-week period during the austral summer of 2005. The measurements were performed at the British Antarctic Survey's Halley Research Station ( 75 degrees 35' S, 26 degrees 19' W), us...
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European Geosciences Union
2007
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ftnerc:oai:nora.nerc.ac.uk:11690 2023-05-15T13:45:10+02:00 Observations of OH and HO2 radicals in coastal Antarctica Bloss, W.J. Lee, J.D. Heard, D.E. Salmon, Rhian Anya Bauguitte, Stephane Roscoe, Howard Jones, Anna 2007 text http://nora.nerc.ac.uk/id/eprint/11690/ https://nora.nerc.ac.uk/id/eprint/11690/1/acp-7-4171-2007.pdf http://www.atmos-chem-phys.net/7/4171/2007/acp-7-4171-2007.pdf en eng European Geosciences Union https://nora.nerc.ac.uk/id/eprint/11690/1/acp-7-4171-2007.pdf Bloss, W.J.; Lee, J.D.; Heard, D.E.; Salmon, Rhian Anya; Bauguitte, Stephane; Roscoe, Howard; Jones, Anna orcid:0000-0002-2040-4841 . 2007 Observations of OH and HO2 radicals in coastal Antarctica. Atmospheric Chemistry and Physics, 7 (16). 4171-4185. https://doi.org/10.5194/acp-7-4171-2007 <https://doi.org/10.5194/acp-7-4171-2007> Glaciology Chemistry Atmospheric Sciences Publication - Article PeerReviewed 2007 ftnerc https://doi.org/10.5194/acp-7-4171-2007 2023-02-04T19:27:30Z OH and HO2 radical concentrations have been measured in the boundary layer of coastal Antarctica for a six-week period during the austral summer of 2005. The measurements were performed at the British Antarctic Survey's Halley Research Station ( 75 degrees 35' S, 26 degrees 19' W), using the technique of on-resonance laser-induced fluorescence to detect OH, with HO2 measured following chemical conversion through addition of NO. The mean radical levels were 3.9 x 10(5) molecule cm(-3) for OH, and 0.76 ppt for HO2 ( ppt denotes parts per trillion, by volume). Typical maximum ( local noontime) levels were 7.9 x 10(5) molecule cm(-3) and 1.50 ppt for OH and HO2 respectively. The main sources of HOx were photolysis of O-3 and HCHO, with potentially important but uncertain contributions from HONO and higher aldehydes. Of the measured OH sinks, reaction with CO and CH4 dominated, however comparison of the observed OH concentrations with those calculated via the steady state approximation indicated that additional co-reactants were likely to have been present. Elevated levels of NOx resulting from snowpack photochemistry contributed to HOx cycling and enhanced levels of OH, however the halogen oxides IO and BrO dominated the CH3O2 - HO2 - OH conversion in this environment, with associated ozone destruction. Article in Journal/Newspaper Antarc* Antarctic Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic Austral Halley Research Station ENVELOPE(-26.209,-26.209,-75.605,-75.605) Atmospheric Chemistry and Physics 7 16 4171 4185 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Glaciology Chemistry Atmospheric Sciences |
spellingShingle |
Glaciology Chemistry Atmospheric Sciences Bloss, W.J. Lee, J.D. Heard, D.E. Salmon, Rhian Anya Bauguitte, Stephane Roscoe, Howard Jones, Anna Observations of OH and HO2 radicals in coastal Antarctica |
topic_facet |
Glaciology Chemistry Atmospheric Sciences |
description |
OH and HO2 radical concentrations have been measured in the boundary layer of coastal Antarctica for a six-week period during the austral summer of 2005. The measurements were performed at the British Antarctic Survey's Halley Research Station ( 75 degrees 35' S, 26 degrees 19' W), using the technique of on-resonance laser-induced fluorescence to detect OH, with HO2 measured following chemical conversion through addition of NO. The mean radical levels were 3.9 x 10(5) molecule cm(-3) for OH, and 0.76 ppt for HO2 ( ppt denotes parts per trillion, by volume). Typical maximum ( local noontime) levels were 7.9 x 10(5) molecule cm(-3) and 1.50 ppt for OH and HO2 respectively. The main sources of HOx were photolysis of O-3 and HCHO, with potentially important but uncertain contributions from HONO and higher aldehydes. Of the measured OH sinks, reaction with CO and CH4 dominated, however comparison of the observed OH concentrations with those calculated via the steady state approximation indicated that additional co-reactants were likely to have been present. Elevated levels of NOx resulting from snowpack photochemistry contributed to HOx cycling and enhanced levels of OH, however the halogen oxides IO and BrO dominated the CH3O2 - HO2 - OH conversion in this environment, with associated ozone destruction. |
format |
Article in Journal/Newspaper |
author |
Bloss, W.J. Lee, J.D. Heard, D.E. Salmon, Rhian Anya Bauguitte, Stephane Roscoe, Howard Jones, Anna |
author_facet |
Bloss, W.J. Lee, J.D. Heard, D.E. Salmon, Rhian Anya Bauguitte, Stephane Roscoe, Howard Jones, Anna |
author_sort |
Bloss, W.J. |
title |
Observations of OH and HO2 radicals in coastal Antarctica |
title_short |
Observations of OH and HO2 radicals in coastal Antarctica |
title_full |
Observations of OH and HO2 radicals in coastal Antarctica |
title_fullStr |
Observations of OH and HO2 radicals in coastal Antarctica |
title_full_unstemmed |
Observations of OH and HO2 radicals in coastal Antarctica |
title_sort |
observations of oh and ho2 radicals in coastal antarctica |
publisher |
European Geosciences Union |
publishDate |
2007 |
url |
http://nora.nerc.ac.uk/id/eprint/11690/ https://nora.nerc.ac.uk/id/eprint/11690/1/acp-7-4171-2007.pdf http://www.atmos-chem-phys.net/7/4171/2007/acp-7-4171-2007.pdf |
long_lat |
ENVELOPE(-26.209,-26.209,-75.605,-75.605) |
geographic |
Antarctic Austral Halley Research Station |
geographic_facet |
Antarctic Austral Halley Research Station |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/11690/1/acp-7-4171-2007.pdf Bloss, W.J.; Lee, J.D.; Heard, D.E.; Salmon, Rhian Anya; Bauguitte, Stephane; Roscoe, Howard; Jones, Anna orcid:0000-0002-2040-4841 . 2007 Observations of OH and HO2 radicals in coastal Antarctica. Atmospheric Chemistry and Physics, 7 (16). 4171-4185. https://doi.org/10.5194/acp-7-4171-2007 <https://doi.org/10.5194/acp-7-4171-2007> |
op_doi |
https://doi.org/10.5194/acp-7-4171-2007 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
7 |
container_issue |
16 |
container_start_page |
4171 |
op_container_end_page |
4185 |
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1766214715109801984 |