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The distribution of hydrogen, nitrogen, and chlorine radicals in the lower stratosphere: Implications for changes in O3 due to emission of NO(y) from supersonic aircraftIn situ measurements of hydrogen, nitrogen, and chlorine radicals obtained in the lower statosphere 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 N2O5 agree well with measured concentrations of NO and ClO, but concentrations of HO2 and OH are underestimated by 10 to 25%, concentrations of NO2 are overestimated by 10 to 30%, and concentrations of HCl are overestimated by a factor of 2. Discrepancies for (OH) and (HO2) are reduced if we allow for higher yields of O((1)D) from O2 photolysis and for heterogeneous production of HNO2. The data suggest more efficent catalytic removal of O3 by hydrogen and halogen radicals relative to nitrogen oxide radicals than predicted by models using recommendend rates and cross sections. Increased in (O3) in the lower stratosphere may be larger in response to inputs of NO(y) from supersonic aircraft than estimated by current assessment models.
Document ID
19950046401
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Salawitch, R. J.
(Harvard Univ. Cambridge, MA, United States)
Wofsy, S. C.
(Harvard Univ. Cambridge, MA, United States)
We-Nnberg, P. O.
(Harvard Univ. Cambridge, MA, United States)
Cohen, R. C.
(Harvard Univ. Cambridge, MA, United States)
Anderson, J. G.
(Harvard Univ. Cambridge, MA, United States)
Fahey, D. W.
(NOAA Aeronomy Laboratory, Boulder, CO United States)
Gao, R. S.
(NOAA Aeronomy Laboratory, Boulder, CO United States)
Keim, E. R.
(NOAA Aeronomy Laboratory, Boulder, CO United States)
Woodbridge, E. L.
(NASA Ames Research Center Moffett Field, CA, United States)
Stimpfle, R. M.
(Harvard Univ. Cambridge, MA, United States)
Date Acquired
August 16, 2013
Publication Date
November 15, 1994
Publication Information
Publication: Geophysical Research Letters
Volume: 21
Issue: 23
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
95A78000
Funding Number(s)
CONTRACT_GRANT: NAG2-731
CONTRACT_GRANT: NAGW-1230
CONTRACT_GRANT: NAS1-19955
CONTRACT_GRANT: NSF ATM-89-21119
Distribution Limits
Public
Copyright
Other

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