HR: 0800h
AN: A51D-0808    [Abstracts]
TI: Comparisons of Interannual Variability in Ozone as seen by SAGE II, HALOE, and Ozonesondes.
AU: * Terao, Y
EM: tro@io.harvard.edu
AF: Harvard University, Pierce Hall 29 Oxford St, Cambridge, MA 02138 United States
AU: Logan, J
EM: jal@io.harvard.edu
AF: Harvard University, Pierce Hall 29 Oxford St, Cambridge, MA 02138 United States
AU: Megretskaia, I
EM: iam@io.harvard
AF: Harvard University, Pierce Hall 29 Oxford St, Cambridge, MA 02138 United States
AB: SAGE II and ozonesondes are the two primary source of information on trends in the vertical distribution of ozone in the mid and lower stratosphere (12-30 km). Ozone sonde data have been used to validate SAGE II ozone data, as well as all other satellite profile measurements of ozone below 30 km, and will be used to validate future profile measurements. Thus the sonde data will inevitably form a bridge between the occultation data and future ozone profile measurements from Aura and NPOESS. Previous work evaluating SAGE II data focused on comparison of nearly coincident profiles, and has shown that SAGE II and sonde data agree within 10% down to the tropopause; however there is a large spread in the differences between SAGE II and sondes in the lowermost stratosphere where ozone is most variable [Wang et al., 2002]. Our focus here is on comparison of the interannual variability shown by SAGE II, HALOE, and ozonesonde data in different regions of the northern mid-latitudes. Consequently, we rely on comparisons of monthly mean time series rather than limiting the results to coincidences. Monthly means form the basis for most trends analyses of ozone. We show here that SAGE II, HALOE, and the sondes are in good agreement in terms of interannual variability in the lowermost stratosphere, even though there are often very large differences in nearly coincident measurements. We use the satellite data to extend our analysis of the factors contributing to interannual variability in ozone. We find that unusually low values of ozone in the mid-latitude lower stratosphere are sometimes associated with so-called "ozone mini-hole" events. We use the occultation data to define the vertical distribution of ozone in these events, and use backward trajectories to determine their origin. Wang, H. J., D. M. Cunnold, L. W. Thomason, J. M Zawodny, and G. E. Bodeker, Assessment of SAGE version 6.1 ozone data quality, J. Geophys. Res, 107 (D23) 4691, 2002.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting