HR: 1340h
AN: A43B-0098    [Abstracts]
TI: New Zenith-sky Total Ozone Column Retrievals Capabilities for OMPS Validation
AU: * Bojkov, B R
EM: Bojan.Bojkov@gsfc.nasa.gov
AF: SSAI, 10210 Greenbelt Rd, Lanham, MD 20706 United States
AU: Cede, A
EM: cede@chescat.gsfc.nasa.gov
AF: SSAI, 10210 Greenbelt Rd, Lanham, MD 20706 United States
AU: Janz, S
EM: Scott.Janz@nasa.gov
AF: NASA GSFC, Code 613, Greenbelt, MD 20771 United States
AB: An algorithm to determine the total column ozone from zenith-sky intensities in the ultraviolet has been developed at the NASA Goddard Space Flight Center. The algorithm, called ZTOZ, derives total ozone column amounts by comparing a ratio of measured intensities from three wavelengths with the equivalent intensity ratios calculated by radiative transfer. ZTOZ allows retrievals of total ozone at solar zenith angles larger than 70 degrees with far more accuracy than can be provided by conventional direct-sun measurements. This capability is important for validating satellite total ozone column measurements, such as from OMPS, at high solar zenith angles and mid and high latitudes where the direct-sun retrievals become increasingly less accurate. For the period beginning in October 2001, the differences between the ZTOZ and the collocated direct-sun total column ozone measurements are within 2% and the precision is 1% or less. The ZTOZ methodology, as well as the influences of the ozone profiles, surface albedo, solar zenith angle, and aerosols on the accuracy of the retrieved total ozone amounts will be presented. The applicability of ZTOZ for the NPP/NPOESS missions will also be discussed.
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005