HR: 0800h
AN: A51D-0809    [Abstracts]
TI: Two-Dimensional Assimilation of the Solar Occultation Satellite Data from SAGE II and HALOE Together with SBUV Data to Study Long-term Ozone Trends
AU: * Geller, M A
EM: Marvin.Geller@sunysb.edu
AF: Stony Brook University, MSRC/ITPA Stony Brook University, Stony Brook, NY 11794-5000 United States
AU: Smyshlyaev, S P
EM: smyshl@meteo.rshmi.spb.ru
AF: Russian State Hydrometeorological University, Maloohtinsky 98, St. Petersburg, 195196 Russian Federation
AB: The Solar occultation data from SAGE II and HALOE have excellent vertical resolution but poor geographical coverage for a single day. In contrast, SBUV data has good geographical coverage but relatively poor vertical resolution. The methodology of two-dimensional chemistry-transport model-driven data assimilation allows us to combine these different instrument observations in a single mathematical framework to evaluate atmospheric ozone changes for several decades (1979-2003) and sets the stage for the future smooth connection to the SAGE II and HALOE data when these instruments stop functioning. The SUNY-SPb two-dimensional transport-chemistry model has been used to assimilate atmospheric composition data from different satellite instruments. The associated errors of the satellite observations are objectively calculated based on estimation theory. SBUV versus SAGE II and HALOE versus SAGE II results are compared for their overlap periods (1985-1989 and 1992-2003) based on the assimilation model calculation. Differences between global ozone trends derived from data only and from model assimilated ones are discussed. The differences between ozone trends in the Northern and Southern Hemispheres are discussed based on the difference in the air exchange between polar and mid-latitudes in the two hemispheres. Assimilated satellite data are used to study the role of solar activity variations, atmospheric dynamics, and aerosol effects for long-term ozone variability in different stratospheric altitude ranges.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
DE: 0370 Volcanic effects (8409)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting