OH, HO_2, NO in two biomass burning plumes: Sources of HO_x and implications for ozone production
Abstract
The ER-2 made two descents through upper tropospheric biomass burning plumes during ASHOE/MAESA. HO_x (= OH + HO_2) concentrations are largely self-limited outside the plumes, but become progressively more limited by reactions with NO_x (= NO + NO_2) at the higher NO_x concentrations inside the plumes. Sources of HO_x in addition to H_(2)O and CH_4 oxidation are required to balance the known HOx sinks both in the plumes and in the background upper troposphere. HO_x concentrations were consistently underestimated by a model constrained by observed NO_x concentrations. The size of the model underestimate is reduced when acetone photolysis is included. Models which do not include the additional HO_x sources required to balance the HO_x budget are likely to underestimate ozone production rates.
Additional Information
© 1997 American Geophysical Union. Manuscript Accepted: 17 October 1997; Manuscript Received: 31 May 1997. We acknowledge the assistance of John Neima, helpful comments from A. J. Weinheimer, and financial support from the Atmospheric Environment Service and Natural Sciences and Engineering Council of Canada. We thank the ER-2 pilots and ground crew, and the ASHOE/MAESA investigators for the use of their data. The mission scientists for this campaign were Bill Brune and Adrian Tuck. ASHOE/MAESA was supported by NASA through the Upper Atmosphere Research Program, the Atmospheric Effects of Aviation Project, and the Atmospheric Chemistry Modeling and Analysis Program. Additional support for ASHOE/MAESA came from base funding by NOAA.Attached Files
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Additional details
- Alternative title
- OH, HO2, NO in two biomass burning plumes: Sources of HOx and implications for ozone production
- Eprint ID
- 46599
- Resolver ID
- CaltechAUTHORS:20140701-103400492
- Atmospheric Environment Service
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NASA
- National Oceanic and Atmospheric Administration (NOAA)
- Created
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2014-07-01Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences (GPS)