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The distribution of hydrogen, nitrogen, and chlorine radicals in the lower stratosphere: Implications for changes in O_3 due to emission of NO_y from supersonic aircraft

Salawitch, R. J. and Wofsy, S. C. and Wennberg, P. O. and Cohen, R. C. and Anderson, J. G. and Fahey, D. W. and Gao, R. S. and Keim, E. R. and Woodbridge, E. L. and Stimpfle, R. M. and Koplow, J. P. and Kohn, D. W. and Webster, C. R. and May, R. D. and Pfister, L. and Gottlieb, E. W. and Michelsen, H. A. and Yue, G. K. and Wilson, J. C. and Brock, C. A. and Jonsson, H. H. and Dye, J. E. and Baumgardner, D. and Proffitt, M. H. and Loewenstein, M. and Podolske, J. R. and Elkins, J. W. and Dutton, G. S. and Hintsa, E. J. and Dessler, A. E. and Weinstock, E. M. and Kelly, K. K. and Boering, K. A. and Daube, B. C. and Chan, K. R. and Bowen, S. W. (1994) The distribution of hydrogen, nitrogen, and chlorine radicals in the lower stratosphere: Implications for changes in O_3 due to emission of NO_y from supersonic aircraft. Geophysical Research Letters, 21 (23). pp. 2547-2550. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20140716-091039510

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Abstract

In situ measurements of hydrogen, nitrogen, and chlorine radicals obtained in the lower stratosphere during SPADE are compared to results from a photochemical model that assimilates measurements of radical precursors and environmental conditions. Models allowing for heterogeneous hydrolysis of N_2O_5 agree well with measured concentrations of NO and ClO, but concentrations of HO_2 and OH are underestimated by 10 to 25%, concentrations of NO_2 are overestimated by 10 to 30%, and concentrations of HCl are overestimated by a factor of 2. Discrepancies for [OH] and [HO_2] are reduced if we allow for higher yields of O(^1D) from O_3 photolysis and for heterogeneous production of HNO_2. The data suggest more efficient catalytic removal of O_3 by hydrogen and halogen radicals relative to nitrogen oxide radicals than predicted by models using recommended rates and cross sections. Increases in [O_3] in the lower stratosphere may be larger in response to inputs of NO_y from supersonic aircraft than estimated by current assessment models.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/94GL02781DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/94GL02781/fullPublisherArticle
ORCID:
AuthorORCID
Wennberg, P. O.0000-0002-6126-3854
Jonsson, H. H.0000-0003-3043-1074
Alternate Title:The distribution of hydrogen, nitrogen, and chlorine radicals in the lower stratosphere: Implications for changes in O3 due to emission of NOy from supersonic aircraft
Additional Information:© 1994 American Geophysical Union. Received: May 19, 1994; revised: August 29, 1994; accepted: September 7, 1994. Paper number 94GL02781. This work was supported by NASA grants NAG2-731, NAGW-1230, NAS1-19955 and NSF grant ATM-89-21119 to Harvard University. We thank J. Herman and the GSFC processing team for providing data from TOMS and P. Newman and R. Nagatani for providing data from NMC.
Funders:
Funding AgencyGrant Number
NASANAG2-731
NASANAGW-1230
NASANAS1-19955
NSFATM-89-21119
Record Number:CaltechAUTHORS:20140716-091039510
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140716-091039510
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47258
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:16 Jul 2014 19:57
Last Modified:02 May 2017 22:34

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