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Sensitivity of Ozone to Bromine in the Lower StratosphereMeasurements of BrO suggest that inorganic bromine (Br(sub 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 approx.25 years, leading to better agreement between measured and modeled ozone trends. This additional Br(sub 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(sub y) causes photochemical loss of ozone below approx.14 km to change from being controlled by HO(sub x) catalytic cycles (primarily HO2+O3) to a situation where loss by the BrO+HO2 cycle is also important.
Document ID
20070025102
Acquisition Source
Jet Propulsion Laboratory
Document Type
Reprint (Version printed in journal)
Authors
Salawitch, R. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Weisenstein, D. K.
(Atmospheric and Environmental Research, Inc. Lexington, MA, United States)
Kovalenko, L. J.
(California Inst. of Tech. Pasadena, CA, United States)
Sioris, C. E.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Wennberg, P. O.
(California Inst. of Tech. Pasadena, CA, United States)
Chance, K.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Ko, M. K. W.
(NASA Langley Research Center Hampton, VA, United States)
McLinden, C. A.
(Meteorological Service of Canada Toronto, Ontario, Canada)
Date Acquired
August 23, 2013
Publication Date
March 9, 2005
Publication Information
Publication: Geophysical Research Letters, 2005
Publisher: American Geophysical Union
Volume: 32
ISSN: 0094-8276
Subject Category
Meteorology And Climatology
Distribution Limits
Public
Copyright
Other
Keywords
ozone trends
inorganic bromine

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