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The role of HO_x in super- and subsonic aircraft exhaust plumes

Hanisco, T. F. and Wennberg, P. O. and Cohen, R. C. and Anderson, J. G. and Fahey, D. W. and Keim, E. R. and Gao, R. S. and Wamsley, R. C. and Donnelly, S. G. and Del Negro, L. A. and Salawitch, R. J. and Kelly, K. K. and Proffitt, M. H. (1997) The role of HO_x in super- and subsonic aircraft exhaust plumes. Geophysical Research Letters, 24 (1). pp. 65-68. ISSN 0094-8276. doi:10.1029/96GL03724.

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The generation of sulfuric acid aerosols in aircraft exhaust has emerged as a critical issue in determining the impact of supersonic aircraft on stratospheric ozone. It has long been held that the first step in the mechanism of aerosol formation is the oxidation of SO_(2) emitted from the engine by OH in the exhaust plume. We report in situ measurements of OH and HO_(2) in the exhaust plumes of a supersonic (Air France Concorde) and a subsonic (NASA ER-2) aircraft in the lower stratosphere. These measurements imply that reactions with OH are responsible for oxidizing only a small fraction of SO_(2) (2%), and thus cannot explain the large number of particles observed in the exhaust wake of the Concorde.

Item Type:Article
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URLURL TypeDescription
Hanisco, T. F.0000-0001-9434-8507
Wennberg, P. O.0000-0002-6126-3854
Cohen, R. C.0000-0001-6617-7691
Alternate Title:The role of HOx in super- and subsonic aircraft exhaust plumes
Additional Information:© 1997 American Geophysical Union. Received September 26, 1996; revised November 21, 1996; accepted November 25, 1996. The authors thank the pilots of the NASA ER-2 and of the Air France Concorde for their achievements. We also acknowledge support from NASA's Upper Atmospheric Research and High Speed Research Programs.
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Deposited On:02 Jul 2014 21:54
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