Observations of OH and HO 2 radicals in coastal Antarctica
International audience OH and HO 2 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° 35' S, 26° 19...
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ftccsdartic:oai:HAL:hal-00296310v1 2023-11-12T04:01:39+01:00 Observations of OH and HO 2 radicals in coastal Antarctica Bloss, W. J. Lee, J. D. Heard, D. E. Salmon, R. A. Bauguitte, S. J.-B. Roscoe, H. K. Jones, A. E. School of Chemistry Leeds University of Leeds British Antarctic Survey (BAS) Natural Environment Research Council (NERC) 2007-08-16 https://hal.science/hal-00296310 https://hal.science/hal-00296310/document https://hal.science/hal-00296310/file/acp-7-4171-2007.pdf en eng HAL CCSD European Geosciences Union hal-00296310 https://hal.science/hal-00296310 https://hal.science/hal-00296310/document https://hal.science/hal-00296310/file/acp-7-4171-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00296310 Atmospheric Chemistry and Physics, 2007, 7 (16), pp.4171-4185 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2023-10-21T23:16:55Z International audience OH and HO 2 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° 35' S, 26° 19' W), using the technique of on-resonance laser-induced fluorescence to detect OH, with HO 2 measured following chemical conversion through addition of NO. The mean radical levels were 3.9×10 5 molecule cm ?3 for OH, and 0.76 ppt for HO 2 (ppt denotes parts per trillion, by volume). Typical maximum (local noontime) levels were 7.9×10 5 molecule cm ?3 and 1.50 ppt for OH and HO 2 respectively. The main sources of HO x 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 CH 4 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 NO x resulting from snowpack photochemistry contributed to HO x cycling and enhanced levels of OH, however the halogen oxides IO and BrO dominated the CH 3 O 2 ? HO 2 ? OH conversion in this environment, with associated ozone destruction. Article in Journal/Newspaper Antarc* Antarctic Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Austral Halley Research Station ENVELOPE(-26.209,-26.209,-75.605,-75.605) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Bloss, W. J. Lee, J. D. Heard, D. E. Salmon, R. A. Bauguitte, S. J.-B. Roscoe, H. K. Jones, A. E. Observations of OH and HO 2 radicals in coastal Antarctica |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience OH and HO 2 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° 35' S, 26° 19' W), using the technique of on-resonance laser-induced fluorescence to detect OH, with HO 2 measured following chemical conversion through addition of NO. The mean radical levels were 3.9×10 5 molecule cm ?3 for OH, and 0.76 ppt for HO 2 (ppt denotes parts per trillion, by volume). Typical maximum (local noontime) levels were 7.9×10 5 molecule cm ?3 and 1.50 ppt for OH and HO 2 respectively. The main sources of HO x 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 CH 4 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 NO x resulting from snowpack photochemistry contributed to HO x cycling and enhanced levels of OH, however the halogen oxides IO and BrO dominated the CH 3 O 2 ? HO 2 ? OH conversion in this environment, with associated ozone destruction. |
author2 |
School of Chemistry Leeds University of Leeds British Antarctic Survey (BAS) Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Bloss, W. J. Lee, J. D. Heard, D. E. Salmon, R. A. Bauguitte, S. J.-B. Roscoe, H. K. Jones, A. E. |
author_facet |
Bloss, W. J. Lee, J. D. Heard, D. E. Salmon, R. A. Bauguitte, S. J.-B. Roscoe, H. K. Jones, A. E. |
author_sort |
Bloss, W. J. |
title |
Observations of OH and HO 2 radicals in coastal Antarctica |
title_short |
Observations of OH and HO 2 radicals in coastal Antarctica |
title_full |
Observations of OH and HO 2 radicals in coastal Antarctica |
title_fullStr |
Observations of OH and HO 2 radicals in coastal Antarctica |
title_full_unstemmed |
Observations of OH and HO 2 radicals in coastal Antarctica |
title_sort |
observations of oh and ho 2 radicals in coastal antarctica |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00296310 https://hal.science/hal-00296310/document https://hal.science/hal-00296310/file/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_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00296310 Atmospheric Chemistry and Physics, 2007, 7 (16), pp.4171-4185 |
op_relation |
hal-00296310 https://hal.science/hal-00296310 https://hal.science/hal-00296310/document https://hal.science/hal-00296310/file/acp-7-4171-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782332975883485184 |