Sensitivity of ozone to bromine in the lower stratosphere
Abstract
Measurements of BrO suggest that inorganic bromine (Br_y) at and above the tropopause is 4 to 8 ppt greater than assumed in models used in past ozone trend assessment studies. This additional bromine is likely carried to the stratosphere by short-lived biogenic compounds and their decomposition products, including tropospheric BrO. Including this additional bromine in an ozone trend simulation increases the computed ozone depletion over the past ∼25 years, leading to better agreement between measured and modeled ozone trends. This additional Br_y (assumed constant over time) causes more ozone depletion because associated BrO provides a reaction partner for ClO, which increases due to anthropogenic sources. Enhanced Br_y causes photochemical loss of ozone below ∼14 km to change from being controlled by HO_x catalytic cycles (primarily HO_2+O_3) to a situation where loss by the BrO+HO_2 cycle is also important.
Additional Information
© 2005 American Geophysical Union. Received 15 September 2004; revised 23 November 2004; accepted 3 February 2005; article first published online 9 March 2005. We thank R. Schofield for helpful discussions and sharing results prior to publication, W. Randel for sharing O_3 trend data files, F. Goutail for providing SAOZ BrO data files, and the reviewers for constructive comments. Research at the Jet Propulsion Laboratory, California Institute of Technology, is performed under contract with the National Aeronautics and Space Administration (NASA). Research at the Smithsonian Astrophysical Observatory is supported by NASA and the Smithsonian Institution. Work at AER is funded by the NASA ACMAP and SOSST programs.Attached Files
Published - grl19102.pdf
Supplemental Material - grl19102-sup-0001-README.txt
Supplemental Material - grl19102-sup-0002-text.txt
Supplemental Material - grl19102-sup-0003-supp.pdf
Supplemental Material - grl19102-sup-0004-fig6.eps
Supplemental Material - grl19102-sup-0005-fig7.eps
Supplemental Material - grl19102-sup-0006-fig8.eps
Supplemental Material - grl19102-sup-0007-fig9.eps
Supplemental Material - grl19102-sup-0008-tbl1.txt
Supplemental Material - grl19102-sup-0009-tbl2.txt
Supplemental Material - grl19102-sup-0010-tbl3.txt
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Additional details
- Eprint ID
- 46617
- Resolver ID
- CaltechAUTHORS:20140702-074734843
- NASA
- Smithsonian Institution
- Created
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2014-07-02Created 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