HR: 15:25h
AN: A53D-07    [Abstracts]
TI: Measurements of Trace Gas (NO2, SO2, HCHO, O3) Amounts, Aerosol Properties, and UV Irradiance for Aura Validation Using Overlapping Spectral Measurements from Four Different Instruments
AU: * Herman, J R
EM: herman@tparty.gsfc.nasa.gov
AF: Goddard Space Flight Center, NASA/GSFC Code 916, Greenbelt, MD 20771 United States
AU: Cede, A
EM: cede@chescat.gsfc.nasa.gov
AF: Goddard Space Flight Center, NASA/GSFC Code 916, Greenbelt, MD 20771 United States
AU: Cede, A
EM: cede@chescat.gsfc.nasa.gov
AF: SSAI, NASA/GSFC Code 916, Greenbelt, MD 20771 United States
AB: Aura validation measurements of NO2, SO2, HCHO, O3, aerosol properties, and UV irradiance are discussed based on a closure experiment using a coordinated suite of four ground-based instruments currently operating at Goddard Space Flight Center (GSFC). The instrument cluster will be operated at GSFC and the data compared with results from AURA overflights. After the initial AURA comparisons, we plan to move the instrument suite to other sites for participation in AURA aircraft campaigns and to sites that measure in extremely polluted and extremely clean environments. The four instruments are 1) a uniquely improved double Brewer spectrometer, 2) a modified UV Multifilter Rotating Radiometer (UV-MFRSR), 3) a CIMEL sun and sky photometer, and 4) an aerosol Micropulse Lidar (MPL). O3, NO2, HCHO, and SO2 column amounts will be measured by using the improved double Brewer spectrometer in direct-sun mode. A new "bootstrap" solar irradiance method has enabled the Brewer spectrometer to detect NO2, HCHO, and SO2 with a sensitivity of approximately 0.4 DU. Clean-site solar irradiance data from Mauna Loa will improve the sensitivity. O3 and UV irradiances will be measured by both the Brewer spectrometer and UV-MFRSR providing overlapping ground-based data and validation for Aura observations. Aerosol properties will be measured by three instruments (Brewer, CIMEL, and UV-MFRSR), providing particle size, optical depth, and absorption optical thickness (single scattering albedo) as a function of wavelength in the combined UV-Visible spectral range (305nm - 1020nm). The extension of these properties into the UV range will be used to validate aerosol UV-VIS absorption optical thickness measurements from the Aura-OMI spectrometer.
DE: 3360 Remote sensing
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting