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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ftuniveastangl:oai:ueaeprints.uea.ac.uk:52858 2023-05-15T13:45:56+02:00 Measurements of OH and RO2 radicals at Dome C, East Antarctica Kukui, A. Legrand, M. Preunkert, S. Frey, M. M. Loisil, R. Gil Roca, J. Jourdain, B. King, M. D. France, J. L. Ancellet, G. 2014-11-26 https://ueaeprints.uea.ac.uk/id/eprint/52858/ https://doi.org/10.5194/acp-14-12373-2014 unknown Kukui, A., Legrand, M., Preunkert, S., Frey, M. M., Loisil, R., Gil Roca, J., Jourdain, B., King, M. D., France, J. L. and Ancellet, G. (2014) Measurements of OH and RO2 radicals at Dome C, East Antarctica. Atmospheric Chemistry and Physics, 14 (22). pp. 12373-12392. ISSN 1680-7324 doi:10.5194/acp-14-12373-2014 Article PeerReviewed 2014 ftuniveastangl https://doi.org/10.5194/acp-14-12373-2014 2023-01-30T21:40:37Z 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 × 106 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 net 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 (25–35)% of measured photolysis of HONO is required. Even with a factor of 5 reduction in the concentrations of HONO, the photolysis of HONO represents the major primary radical source at Dome C. To account for a possibility of an overestimation of NO2 observed at Dome C the calculations were also performed with NO2 concentrations estimated by assuming ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica South pole South pole University of East Anglia: UEA Digital Repository Antarctic Austral Concordia Station ENVELOPE(123.333,123.333,-75.100,-75.100) East Antarctica South Pole The Antarctic Atmospheric Chemistry and Physics 14 22 12373 12392 |
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Open Polar |
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University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
unknown |
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 × 106 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 net 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 (25–35)% of measured photolysis of HONO is required. Even with a factor of 5 reduction in the concentrations of HONO, the photolysis of HONO represents the major primary radical source at Dome C. To account for a possibility of an overestimation of NO2 observed at Dome C the calculations were also performed with NO2 concentrations estimated by assuming ... |
format |
Article in Journal/Newspaper |
author |
Kukui, A. Legrand, M. Preunkert, S. Frey, M. 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. 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. 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 |
publishDate |
2014 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/52858/ https://doi.org/10.5194/acp-14-12373-2014 |
long_lat |
ENVELOPE(123.333,123.333,-75.100,-75.100) |
geographic |
Antarctic Austral Concordia Station East Antarctica South Pole The Antarctic |
geographic_facet |
Antarctic Austral Concordia Station East Antarctica South Pole The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica South pole South pole |
op_relation |
Kukui, A., Legrand, M., Preunkert, S., Frey, M. M., Loisil, R., Gil Roca, J., Jourdain, B., King, M. D., France, J. L. and Ancellet, G. (2014) Measurements of OH and RO2 radicals at Dome C, East Antarctica. Atmospheric Chemistry and Physics, 14 (22). pp. 12373-12392. ISSN 1680-7324 doi:10.5194/acp-14-12373-2014 |
op_doi |
https://doi.org/10.5194/acp-14-12373-2014 |
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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1766232876276252672 |