HR: 09:15h
AN: A11A-04    [Abstracts]
TI: Ozone Observations by the Gas and Aerosol Measurement Sensor During SOLVE II
AU: * Pitts, M
EM: Michael.C.Pitts@nasa.gov
AF: NASA Langley Research Center, Mail Stop 475, Hampton, VA 23681
AU: Zawodny, J
EM: Joseph.M.Zawodny@nasa.gov
AF: NASA Langley Research Center, Mail Stop 475, Hampton, VA 23681
AU: Thomason, L
EM: L.W.Thomason@nasa.gov
AF: NASA Langley Research Center, Mail Stop 475, Hampton, VA 23681
AU: Wenny, B
EM: bn.wenny@larc.nasa.gov
AF: Science Applications International Corp., One Enterprise Parkway, Hampton, VA 23666
AB: The Gas and Aerosol Measurement Sensor (GAMS) was deployed aboard the NASA DC-8 aircraft during the second SAGE III Ozone Loss and Validation Experiment (SOLVE II) based in Kiruna, Sweden during January-February 2003. GAMS acquired line-of-sight (LOS) direct solar irradiance spectra during the sunlit portions of eleven science flights of the DC-8 between January 11 and February 6, 2003. Differential LOS ozone number densities are retrieved from the GAMS spectra using a multiple linear regression spectral fitting technique. GAMS ozone measurements are compared with coincident ozone measurements from two other solar instruments aboard the DC-8 platform to demonstrate the robustness and stability of the GAMS ozone retrievals. The GAMS ozone measurements are then utilized to experimentally assess the quality of the ozone molecular absorption cross-sections tabulated for the ozone Wulf bands that extend from near 730 to 1030 nm. Accurate knowledge of the Wulf band ozone cross sections is critical to the success of the SAGE III temperature/pressure, water vapor, and aerosol retrievals. Results from this study suggest the ozone cross section compilation of Shettle and Anderson currently used operationally in SAGE III data processing may be in error by as much as 10-20% in the Wulf bands and their lack of reported temperature dependence is a significant deficiency. An ozone cross section database compiled for the SCIAMACHY satellite mission appears to be of better quality in the Wulf bands, but still may have errors in shape as large as 5-10%. Additional laboratory measurements of the Wulf band cross sections should be pursued to further reduce their uncertainty and better quantify their temperature dependence.
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly