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Preliminary assessment of possible aerosol contamination effects on SAGE ozone trends in the lower stratosphereAn investigation of the validity of long-term ozone trends in the lower stratosphere derived from SAGE I and II measurements is described. At altitudes below approximately 20 km, it is important to separate the ozone and aerosol contributions to SAGE extinction at 600 nm. The correlation between SAGE II measurements of ozone and aerosols indicates that most of the variability in these parameters is associated with physically induced variations resulting from quasi-horizontal motions of air parcels. The SAGE ozone measurements are however found to be as much as 20 percent larger than coincident ozonesonde measurements between 15 and 20 km altitude. A sudden change in the difference at approximately 14.5 km altitude for which there is a change in the SAGE aerosol retrieval procedure suggests that SAGE ozone trends below 20 km altitude may be more sensitive to aerosol variations. Between 20 and 25 km altitude, however, both SAGE and the ozonesondes indicate a reduction in ozone of approximately 0.5 percent/year over the period 1979 to 1989 at midlatitudes of the Northern Hemisphere.
Document ID
19910049964
Document Type
Reprint (Version printed in journal)
Authors
Cunnold, Derek M. (Georgia Institute of Technology Atlanta, United States)
Veiga, Robert E. (ST Systems Corp. Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Advances in Space Research
Volume: 11
Issue: 3 19
ISSN: 0273-1177
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS1-18460
CONTRACT_GRANT: NAS1-18387
CONTRACT_GRANT: NAS1-18938
Distribution Limits
Public
Copyright
Other