HR: 0800h
AN: A51D-0803    [Abstracts]
TI: A long data record (1979-2003) of stratospheric ozone derived from TOMS Cloud Slicing: Comparison with SAGE and implications for ozone recovery
AU: * Ziemke, J R
EM: ziemke@jwocky.gsfc.nasa.gov
AF: UMBC GEST, Baltimore, Maryland, MD 21250 United States
AB: Abstract. It is generally recognized that Stratospheric Aerosols and Gas Experiment (SAGE) stratospheric ozone data have become a standard long-record reference field for comparison with other stratospheric ozone measurements. This study demonstrates that stratospheric column ozone (SCO) derived from total ozone mapping spectrometer (TOMS) Cloud Slicing may be used to supplement SAGE data as a stand-alone long-record reference field in the tropics extending to middle and high latitudes over the Pacific. Comparisons of SAGE II version 6.2 SCO and TOMS version 8 Cloud Slicing SCO for 1984-2003 exhibit remarkable agreement in monthly ensemble means to within 1-3 Dobson Units (DU) (i.e., 1-1.5 percent of SCO) despite being independently-calibrated measurements. An important component of our study is to incorporate these column ozone measurements to investigate long-term trends for the period 1979-2003. Our study includes Solar Backscatter Ultraviolet (SBUV) version 8 measurements of upper stratospheric column ozone (i.e., zero to 32 hPa column ozone) to characterize seasonal cycles and seasonal trends in this region, as well as the lower stratosphere and troposphere when combined with TOMS SCO and total column ozone. The trend analyses suggest that most ozone reduction in the atmosphere since 1979 in mid-to-high latitudes has occurred in the lower stratosphere below ~25 km. The delineation of upper and lower stratospheric column ozone indicates that trends in the upper stratosphere during the latter half of the 1979-2003 period have reduced to near zero globally, while trends in the lower stratosphere have become larger by ~5 DU per decade from the tropics extending to mid-latitudes in both hemispheres. For TCO, the trend analyses suggest moderate increases over the 25-year time record in the extra-tropics of both hemispheres of around 4-6 DU (Northern Hemisphere) and 6-8 DU (Southern Hemisphere).
UR: http://hyperion.gsfc.nasa.gov/Data\_services/cloud\_slice/index.html
DE: 3360 Remote sensing
DE: 3314 Convective processes
DE: 0320 Cloud physics and chemistry
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting