Measurement of HO 2 NO 2 in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004
The first direct in situ measurements of HO2NO2 in the upper troposphere were performed from the NASA DC-8 during the Intercontinental Chemical Transport Experiment–North America 2004 with a chemical ionization mass spectrometer (CIMS). These measurements provide an independent diagnostic of HOx che...
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ftcdlib:qt4pr327c0 2023-05-15T18:22:55+02:00 Measurement of HO 2 NO 2 in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004 Kim, S. Huey, L. G Stickel, R. E Tanner, D. J Crawford, J. H Olson, J. R Chen, G. Brune, W. H Ren, X. Lesher, R. Wooldridge, P. J Bertram, T. H Perring, A. Cohen, R. C Lefer, B. L Shetter, R. E Avery, M. Diskin, G. Sokolik, I. 2007-02-10 application/pdf http://www.escholarship.org/uc/item/4pr327c0 english eng eScholarship, University of California qt4pr327c0 http://www.escholarship.org/uc/item/4pr327c0 Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Kim, S.; Huey, L. G; Stickel, R. E; Tanner, D. J; Crawford, J. H; Olson, J. R; et al.(2007). Measurement of HO 2 NO 2 in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004. Journal of Geophysical Research, 112(D12). doi:10.1029/2006jd007676. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/4pr327c0 Physical Sciences and Mathematics peroxynitric acid pernitric acid reactive nitrogen rate coefficient boundary-layer south-pole hox oh stratosphere HO(X) article 2007 ftcdlib https://doi.org/10.1029/2006jd007676 2016-04-02T18:37:33Z The first direct in situ measurements of HO2NO2 in the upper troposphere were performed from the NASA DC-8 during the Intercontinental Chemical Transport Experiment–North America 2004 with a chemical ionization mass spectrometer (CIMS). These measurements provide an independent diagnostic of HOx chemistry in the free troposphere and complement direct observations of HOx, because of the dual dependency of HO2NO2 on HOx and NOx. On average, the highest HO2NO2 mixing ratio of 76 pptv (median = 77 pptv,σ = 39 pptv) was observed at altitudes of 8–9 km. Simple steady state calculations of HO2NO2, constrained by measurements of HOx, NOx, and J values, are in good agreement (slope = 0.90, R2 = 0.60, and z = 5.5–7.5 km) with measurements in the midtroposphere where thermal decomposition is the major loss process. Above 8 km the calculated steady state HO2NO2 is in poor agreement with observed values (R2 = 0.20) and is typically larger by a factor of 2.4. Conversely, steady state calculations using model-derived HOx show reasonable agreement with the observed HO2NO2 in both the midtroposphere (slope = 0.96, intercept = 7.0, and R2 = 0.63) and upper troposphere (slope = 0.80, intercept = 32.2, and R2 = 0.58). These results indicate that observed HO2 and HO2NO2 are in poor agreement in the upper troposphere but that HO2NO2 levels are consistent with current photochemical theory. Article in Journal/Newspaper South pole University of California: eScholarship South Pole Journal of Geophysical Research 112 D12 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Physical Sciences and Mathematics peroxynitric acid pernitric acid reactive nitrogen rate coefficient boundary-layer south-pole hox oh stratosphere HO(X) |
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Physical Sciences and Mathematics peroxynitric acid pernitric acid reactive nitrogen rate coefficient boundary-layer south-pole hox oh stratosphere HO(X) Kim, S. Huey, L. G Stickel, R. E Tanner, D. J Crawford, J. H Olson, J. R Chen, G. Brune, W. H Ren, X. Lesher, R. Wooldridge, P. J Bertram, T. H Perring, A. Cohen, R. C Lefer, B. L Shetter, R. E Avery, M. Diskin, G. Sokolik, I. Measurement of HO 2 NO 2 in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004 |
topic_facet |
Physical Sciences and Mathematics peroxynitric acid pernitric acid reactive nitrogen rate coefficient boundary-layer south-pole hox oh stratosphere HO(X) |
description |
The first direct in situ measurements of HO2NO2 in the upper troposphere were performed from the NASA DC-8 during the Intercontinental Chemical Transport Experiment–North America 2004 with a chemical ionization mass spectrometer (CIMS). These measurements provide an independent diagnostic of HOx chemistry in the free troposphere and complement direct observations of HOx, because of the dual dependency of HO2NO2 on HOx and NOx. On average, the highest HO2NO2 mixing ratio of 76 pptv (median = 77 pptv,σ = 39 pptv) was observed at altitudes of 8–9 km. Simple steady state calculations of HO2NO2, constrained by measurements of HOx, NOx, and J values, are in good agreement (slope = 0.90, R2 = 0.60, and z = 5.5–7.5 km) with measurements in the midtroposphere where thermal decomposition is the major loss process. Above 8 km the calculated steady state HO2NO2 is in poor agreement with observed values (R2 = 0.20) and is typically larger by a factor of 2.4. Conversely, steady state calculations using model-derived HOx show reasonable agreement with the observed HO2NO2 in both the midtroposphere (slope = 0.96, intercept = 7.0, and R2 = 0.63) and upper troposphere (slope = 0.80, intercept = 32.2, and R2 = 0.58). These results indicate that observed HO2 and HO2NO2 are in poor agreement in the upper troposphere but that HO2NO2 levels are consistent with current photochemical theory. |
format |
Article in Journal/Newspaper |
author |
Kim, S. Huey, L. G Stickel, R. E Tanner, D. J Crawford, J. H Olson, J. R Chen, G. Brune, W. H Ren, X. Lesher, R. Wooldridge, P. J Bertram, T. H Perring, A. Cohen, R. C Lefer, B. L Shetter, R. E Avery, M. Diskin, G. Sokolik, I. |
author_facet |
Kim, S. Huey, L. G Stickel, R. E Tanner, D. J Crawford, J. H Olson, J. R Chen, G. Brune, W. H Ren, X. Lesher, R. Wooldridge, P. J Bertram, T. H Perring, A. Cohen, R. C Lefer, B. L Shetter, R. E Avery, M. Diskin, G. Sokolik, I. |
author_sort |
Kim, S. |
title |
Measurement of HO 2 NO 2 in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004 |
title_short |
Measurement of HO 2 NO 2 in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004 |
title_full |
Measurement of HO 2 NO 2 in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004 |
title_fullStr |
Measurement of HO 2 NO 2 in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004 |
title_full_unstemmed |
Measurement of HO 2 NO 2 in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004 |
title_sort |
measurement of ho 2 no 2 in the free troposphere during the intercontinental chemical transport experiment–north america 2004 |
publisher |
eScholarship, University of California |
publishDate |
2007 |
url |
http://www.escholarship.org/uc/item/4pr327c0 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
Kim, S.; Huey, L. G; Stickel, R. E; Tanner, D. J; Crawford, J. H; Olson, J. R; et al.(2007). Measurement of HO 2 NO 2 in the free troposphere during the Intercontinental Chemical Transport Experiment–North America 2004. Journal of Geophysical Research, 112(D12). doi:10.1029/2006jd007676. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/4pr327c0 |
op_relation |
qt4pr327c0 http://www.escholarship.org/uc/item/4pr327c0 |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2006jd007676 |
container_title |
Journal of Geophysical Research |
container_volume |
112 |
container_issue |
D12 |
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1766202332381446144 |