Balloon observations of organic and inorganic chlorine in the stratosphere: The role of HClO_4 production on sulfate aerosol
Abstract
Simultaneous observations of stratospheric organic and inorganic chlorine were made in September 1993 out of Fort Sumner, New Mexico, using the JPL balloon-borne MkIV interferometer. Between 15 and 20 km, a significant fraction (20–60%) of the inorganic chlorine could not be accounted for by the sum of measured HCl, ClONO_2, and HOCl. Laboratory measurements of the reaction of ClO radicals on sulfuric acid solutions have indicated that, along with HCl, small amounts of perchloric acid, HClO_4, were formed. Very little is known about the fate of HClO_4 in the stratosphere and we use a photochemical box model to determine the impact of this new species on the partitioning of inorganic chlorine in the stratosphere. Assuming that HClO_4 is photochemically stable, it is shown that in the enhanced aerosol loading conditions resulting from Mt. Pinatubo's eruption, HClO_4 could represent a significant reservoir of chlorine in the lower stratosphere, sequestering up to 0.2 ppbv (or 50%) of the total inorganic chlorine at 16 km. The occurrence of this new species could bring to closure the inorganic chlorine budget deficiency made apparent by recent ER-2 aircraft in situ measurements of HCl.
Additional Information
© 1996 American Geophysical Union. Received January 4, 1996; revised April 15, 1996; accepted April 30, 1996. The authors would like to thank S. Sander, C. Webster, R. Martin, J. Francisco, and S. Martin for helpful discussions, X. Tie for providing his 2-D model output, and R. Stachnik for making his data available before publication. Part of the research described in this paper was carried out by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration(NASA). This research is also supported in part by NASA grant NAGW-413 to the California Institute of Technology.Attached Files
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Additional details
- Alternative title
- Balloon observations of organic and inorganic chlorine in the stratosphere: The role of HClO4 production on sulfate aerosol
- Eprint ID
- 48654
- Resolver ID
- CaltechAUTHORS:20140818-112821288
- NAGW-413
- NASA
- Created
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2014-08-19Created 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