HR: 0800h
AN: A41A-0015    [Abstracts]
TI: Comparisons of OMI Cloud Pressures Derived From Rotational Raman Scattering With Collocated EOS Aqua/MODIS Data
AU: * Vasilkov, A P
EM: alexander_vassilkov@ssaihq.com
AF: Science Systems and Applications, Inc., 10210 Greenbelt Rd, Suite 400, Lanham, MD 20706 United States
AU: Joiner, J
EM: joanna.joiner@nasa.gov
AF: NASA Goddard Space Flight Center, Code 613, Greenbelt, MD 20771 United States
AB: The OMI cloud pressure product is necessary for correction of the mission-critical total ozone product for ozone amount unseen by the instrument beneath clouds. Cloud pressure is derived from the high frequency structure of the top-of-atmosphere reflectance in the UV caused by rotational Raman scattering (RRS) in the atmosphere. RRS results in filling-in of Fraunhofer lines in the backscatter UV spectra. Clouds reduce the amount of filling-in of Fraunhofer lines, with the amount of filling-in related to the cloud pressure. The OMI cloud pressure retrievals are compared with collocated EOS Aqua/MODIS cloud-top pressures for several tropical storm events. The comparisons for Tropical Storm Arlene on June 11, 2005 revealed an interesting feature: the differences between OMI and MODIS cloud pressures for high reflectivity clouds (R>80%) were very small for clouds over the ocean and were as high as 300 hPa for clouds over land. The differences between OMI cloud pressures and MODIS cloud-top pressures are explained by noticeable penetration of solar light into clouds in the UV spectral region.
DE: 3311 Clouds and aerosols
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005