Measurements of OH and RO2 radicals at Dome C, East Antarctica
Concentrations of OH radicals and the sum of peroxy radicals, RO2, were measured in the boundary layer for the first time on the East Antarctic Plateau at the Concordia Station (Dome C, 75.10° S, 123.31° E) during the austral summer 2011/2012. The median concentrations of OH and RO2 radicals were 3....
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European Geosciences Union
2014
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Online Access: | http://nora.nerc.ac.uk/id/eprint/506988/ https://nora.nerc.ac.uk/id/eprint/506988/1/acp-14-12373-2014.pdf |
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ftnerc:oai:nora.nerc.ac.uk:506988 2023-05-15T13:48:08+02:00 Measurements of OH and RO2 radicals at Dome C, East Antarctica Kukui, A. Legrand, M. Preunkert, S. Frey, M. Loisil, R. Gil Roca, J. Jourdain, B. King, M.D. France, J.L. Ancellet, G. 2014-11-26 text http://nora.nerc.ac.uk/id/eprint/506988/ https://nora.nerc.ac.uk/id/eprint/506988/1/acp-14-12373-2014.pdf en eng European Geosciences Union https://nora.nerc.ac.uk/id/eprint/506988/1/acp-14-12373-2014.pdf Kukui, A.; Legrand, M.; Preunkert, S.; Frey, M. orcid:0000-0003-0535-0416 Loisil, R.; Gil Roca, J.; Jourdain, B.; King, M.D.; France, J.L.; Ancellet, G. 2014 Measurements of OH and RO2 radicals at Dome C, East Antarctica. Atmospheric Chemistry & Physics, 14. 12373-12392. https://doi.org/10.5194/acp-14-12373-2014 <https://doi.org/10.5194/acp-14-12373-2014> cc_by CC-BY Publication - Article PeerReviewed 2014 ftnerc 2023-02-04T19:39:30Z Concentrations of OH radicals and the sum of peroxy radicals, RO2, were measured in the boundary layer for the first time on the East Antarctic Plateau at the Concordia Station (Dome C, 75.10° S, 123.31° E) during the austral summer 2011/2012. The median concentrations of OH and RO2 radicals were 3.1 × 106 molecule cm−3 and 9.9 × 107 molecule cm−3, respectively. These values are comparable to those observed at the South Pole, confirming that the elevated oxidative capacity of the Antarctic atmospheric boundary layer found at the South Pole is not restricted to the South Pole but common over the high Antarctic plateau. At Concordia, the concentration of radicals showed distinct diurnal profiles with the median maximum of 5.2 × 106 molecule cm−3 at 11:00 and the median minimum of 1.1 × 106 molecule cm−3 at 01:00 for OH radicals and 1.7 × 108 molecule cm−3 and 2.5 × 107 molecule cm−3 for RO2 radicals at 13:00 and 23:00, respectively (all times are local times). Concurrent measurements of O3, HONO, NO, NO2, HCHO and H2O2 demonstrated that the major primary source of OH and RO2 radicals at Dome C was the photolysis of HONO, HCHO and H2O2, with the photolysis of HONO contributing ∼75% of total primary radical production. However, photochemical modelling with accounting for all these radical sources overestimates the concentrations of OH and RO2 radicals by a factor of 2 compared to field observations. Neglecting the OH production from HONO in the photochemical modelling results in an underestimation of the concentrations of OH and RO2 radicals by a factor of 2. To explain the observations of radicals in this case an additional source of OH equivalent to about 25% of measured photolysis of HONO is required. Even with a factor of 4 reduction in the concentrations of HONO, the photolysis of HONO represents the major primary radical source at Dome C. Another major factor leading to the large concentration of OH radicals measured at Dome C was large concentrations of NO molecules and fast recycling of peroxy radicals to OH ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica South pole South pole Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic East Antarctica Austral South Pole Concordia Station ENVELOPE(123.333,123.333,-75.100,-75.100) Atmospheric Chemistry and Physics 14 22 12373 12392 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Concentrations of OH radicals and the sum of peroxy radicals, RO2, were measured in the boundary layer for the first time on the East Antarctic Plateau at the Concordia Station (Dome C, 75.10° S, 123.31° E) during the austral summer 2011/2012. The median concentrations of OH and RO2 radicals were 3.1 × 106 molecule cm−3 and 9.9 × 107 molecule cm−3, respectively. These values are comparable to those observed at the South Pole, confirming that the elevated oxidative capacity of the Antarctic atmospheric boundary layer found at the South Pole is not restricted to the South Pole but common over the high Antarctic plateau. At Concordia, the concentration of radicals showed distinct diurnal profiles with the median maximum of 5.2 × 106 molecule cm−3 at 11:00 and the median minimum of 1.1 × 106 molecule cm−3 at 01:00 for OH radicals and 1.7 × 108 molecule cm−3 and 2.5 × 107 molecule cm−3 for RO2 radicals at 13:00 and 23:00, respectively (all times are local times). Concurrent measurements of O3, HONO, NO, NO2, HCHO and H2O2 demonstrated that the major primary source of OH and RO2 radicals at Dome C was the photolysis of HONO, HCHO and H2O2, with the photolysis of HONO contributing ∼75% of total primary radical production. However, photochemical modelling with accounting for all these radical sources overestimates the concentrations of OH and RO2 radicals by a factor of 2 compared to field observations. Neglecting the OH production from HONO in the photochemical modelling results in an underestimation of the concentrations of OH and RO2 radicals by a factor of 2. To explain the observations of radicals in this case an additional source of OH equivalent to about 25% of measured photolysis of HONO is required. Even with a factor of 4 reduction in the concentrations of HONO, the photolysis of HONO represents the major primary radical source at Dome C. Another major factor leading to the large concentration of OH radicals measured at Dome C was large concentrations of NO molecules and fast recycling of peroxy radicals to OH ... |
format |
Article in Journal/Newspaper |
author |
Kukui, A. Legrand, M. Preunkert, S. Frey, M. Loisil, R. Gil Roca, J. Jourdain, B. King, M.D. France, J.L. Ancellet, G. |
spellingShingle |
Kukui, A. Legrand, M. Preunkert, S. Frey, M. Loisil, R. Gil Roca, J. Jourdain, B. King, M.D. France, J.L. Ancellet, G. Measurements of OH and RO2 radicals at Dome C, East Antarctica |
author_facet |
Kukui, A. Legrand, M. Preunkert, S. Frey, M. Loisil, R. Gil Roca, J. Jourdain, B. King, M.D. France, J.L. Ancellet, G. |
author_sort |
Kukui, A. |
title |
Measurements of OH and RO2 radicals at Dome C, East Antarctica |
title_short |
Measurements of OH and RO2 radicals at Dome C, East Antarctica |
title_full |
Measurements of OH and RO2 radicals at Dome C, East Antarctica |
title_fullStr |
Measurements of OH and RO2 radicals at Dome C, East Antarctica |
title_full_unstemmed |
Measurements of OH and RO2 radicals at Dome C, East Antarctica |
title_sort |
measurements of oh and ro2 radicals at dome c, east antarctica |
publisher |
European Geosciences Union |
publishDate |
2014 |
url |
http://nora.nerc.ac.uk/id/eprint/506988/ https://nora.nerc.ac.uk/id/eprint/506988/1/acp-14-12373-2014.pdf |
long_lat |
ENVELOPE(123.333,123.333,-75.100,-75.100) |
geographic |
Antarctic The Antarctic East Antarctica Austral South Pole Concordia Station |
geographic_facet |
Antarctic The Antarctic East Antarctica Austral South Pole Concordia Station |
genre |
Antarc* Antarctic Antarctica East Antarctica South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica South pole South pole |
op_relation |
https://nora.nerc.ac.uk/id/eprint/506988/1/acp-14-12373-2014.pdf Kukui, A.; Legrand, M.; Preunkert, S.; Frey, M. orcid:0000-0003-0535-0416 Loisil, R.; Gil Roca, J.; Jourdain, B.; King, M.D.; France, J.L.; Ancellet, G. 2014 Measurements of OH and RO2 radicals at Dome C, East Antarctica. Atmospheric Chemistry & Physics, 14. 12373-12392. https://doi.org/10.5194/acp-14-12373-2014 <https://doi.org/10.5194/acp-14-12373-2014> |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
14 |
container_issue |
22 |
container_start_page |
12373 |
op_container_end_page |
12392 |
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1766248754392858624 |