HR: 1340h
AN: A33D-0102    [Abstracts]
TI: Validation of Combined SBUV Time Series: Search for Shifts and Biases.
AU: * Petropavlovskikh, I V
EM: irina.petro@noaa.gov
AF: Cooperative Institude for Research in Environmental Sciences, CIRES 216 UCB, Boulder, CO 80309 United States
AU: Bhartia, P K
AF: NASA Goddard Space Flight Center, Code 916, Greenbelt, MD 20771 United States
AU: Ahn, C
AF: Science Systems and Applications Incorporated, 10210 Greenbelt Road, Suite 600, Lanham, MD 20706 United States
AU: Flynn, L E
AF: NOAA/NESDIS, 5200 Auth Road, Suitland, MD 20746 United States
AB: Ground-based and satellite measurements are among the few observing systems that provide long-term data for ozone trend analysis and detection of the first signs of recovery. Although satellite instruments offer wide spatial coverage of ozone profile changes, they often have shorter lifetimes than their ground-based counterparts. To use satellite data for trend analysis, several data records must be combined into a long-term time series, with careful validation required to ensure consistency. This analysis represents the first comparison of upper-stratosphere ozone information observed by two independent systems: the Solar Backscatter UltraViolet (BUV and SBUV/2) instruments on board several NASA and NOAA satellites, and ground-based Dobson spectrophotometer. Trend analyses of the ozone time series from the SBUV/SBUV2 data set are complex because of the multiple instruments involved, changes in the instruments' geo-location, and short time overlaps for inter-calibrations among different instruments. Umkehr Dobson time series are therefore used to validate combined SBUV/SBUV2 dataset at several atmospheric levels. Both the new SBUV Version 8 and the new UMK 2004 profile retrieval algorithms were designed with the goal of studying long-term variability and trends in ozone by optimizing the inter-annual variability of their a priori profiles. Furthermore, all UMK04 profiles had been assessed for stratospheric aerosol errors, which are related not only to aerosol optical depth, but also to the height of aerosol maximum load over the ground-based station. We use over-pass SBUV data to confirm aerosol corrections in Dobson time series. The SBUV time series from 1979 to 2003 were analyzed over three Umkehr stations (Arosa, Boulder, and Tateno) in the northern middle latitudes (35øN- 50øN). Generally, both data sets agree well, particularly in layers 6 - 8 (28 km - 43 km), and differences between the satellite and ground-based data do not suggest any significant time-dependent shifts or trends.
UR: http://www.srrb.noaa.gov/research/umkehr, http://daac.gsfc.nasa.gov/data/dataset/ TOMS/DVD-ROMs
DE: 1694 Instruments and techniques
DE: 1610 Atmosphere (0315, 0325)
DE: 1640 Remote sensing
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0340 Middle atmosphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting